SystemParametersInfo 完整详细用法(转自Microsoft MSDN) 英文版，请自行翻译

转载自Microsoft MSDN资料

注：

参数名下面的代码是十六进制，我们平时用的值是十进制，请用系统自带的计算器（XP选择“科学性”，Windows 7选择“程序员”）转换

方法：

例如89是关于输入法的参数值，在计算器中输入89后单击“十六进制”单选框，即可完成自动转换。最后在本页中搜索得出的十六进制代码即可。

Retrieves or sets the value of one of the system-wide parameters. This function can also update the user profile while setting a parameter.

Syntax

BOOL WINAPI SystemParametersInfo(  __in     UINT uiAction,  __in     UINT uiParam,  __inout  PVOID pvParam,  __in     UINT fWinIni);

Parameters

uiAction [in]

Type: UINT

The system-wide parameter to be retrieved or set. The possible values are organized in the following tables of related parameters:

• Accessibility parameters
• Desktop parameters
• Icon parameters
• Input parameters
• Menu parameters
• Power parameters
• Screen saver parameters
• Time-out parameters
• UI effect parameters
• Window parameters

The following are the accessibility parameters.

Accessibility parameterMeaning

SPI_GETACCESSTIMEOUT

0x003C

Retrieves information about the time-out period associated with the accessibility features. The pvParam parameter must point to anACCESSTIMEOUT structure that receives the information. Set the cbSize member of this structure and the uiParam parameter tosizeof(ACCESSTIMEOUT).

SPI_GETAUDIODESCRIPTION

0x0074

Determines whether audio descriptions are enabled or disabled. The pvParam parameter is a pointer to an AUDIODESCRIPTION structure. Set the cbSize member of this structure and the uiParam parameter to sizeof(AUDIODESCRIPTION).

While it is possible for users who have visual impairments to hear the audio in video content, there is a lot of action in video that does not have corresponding audio. Specific audio description of what is happening in a video helps these users understand the content better. This flag enables you to determine whether audio descriptions have been enabled and in which language.

Windows Server 2003 and Windows XP/2000:  This parameter is not supported.

SPI_GETCLIENTAREAANIMATION

0x1042

Determines whether animations are enabled or disabled. The pvParam parameter must point to a BOOL variable that receives TRUE if animations are enabled, or FALSE otherwise.

Display features such as flashing, blinking, flickering, and moving content can cause seizures in users with photo-sensitive epilepsy. This flag enables you to determine whether such animations have been disabled in the client area.

Windows Server 2003 and Windows XP/2000:  This parameter is not supported.

SPI_GETDISABLEOVERLAPPEDCONTENT

0x1040

Determines whether overlapped content is enabled or disabled. The pvParam parameter must point to a BOOL variable that receives TRUE if enabled, or FALSE otherwise.

Display features such as background images, textured backgrounds, water marks on documents, alpha blending, and transparency can reduce the contrast between the foreground and background, making it harder for users with low vision to see objects on the screen. This flag enables you to determine whether such overlapped content has been disabled.

Windows Server 2003 and Windows XP/2000:  This parameter is not supported.

SPI_GETFILTERKEYS

0x0032

Retrieves information about the FilterKeys accessibility feature. The pvParam parameter must point to a FILTERKEYS structure that receives the information. Set the cbSize member of this structure and the uiParam parameter to sizeof(FILTERKEYS).

SPI_GETFOCUSBORDERHEIGHT

0x2010

Retrieves the height, in pixels, of the top and bottom edges of the focus rectangle drawn with DrawFocusRect. The pvParam parameter must point to a UINT value.

Windows 2000:  This parameter is not supported.

SPI_GETFOCUSBORDERWIDTH

0x200E

Retrieves the width, in pixels, of the left and right edges of the focus rectangle drawn with DrawFocusRect. The pvParam parameter must point to a UINT.

Windows 2000:  This parameter is not supported.

SPI_GETHIGHCONTRAST

0x0042

Retrieves information about the HighContrast accessibility feature. The pvParam parameter must point to a HIGHCONTRAST structure that receives the information. Set the cbSize member of this structure and the uiParam parameter to sizeof(HIGHCONTRAST).

For a general discussion, see Remarks.

SPI_GETMESSAGEDURATION

0x2016

Retrieves the time that notification pop-ups should be displayed, in seconds. The pvParam parameter must point to a ULONG that receives the message duration.

Users with visual impairments or cognitive conditions such as ADHD and dyslexia might need a longer time to read the text in notification messages. This flag enables you to retrieve the message duration.

Windows Server 2003 and Windows XP/2000:  This parameter is not supported.

SPI_GETMOUSECLICKLOCK

0x101E

Retrieves the state of the Mouse ClickLock feature. The pvParam parameter must point to a BOOL variable that receives TRUE if enabled, or FALSE otherwise. For more information, see About Mouse Input.

Windows 2000:  This parameter is not supported.

SPI_GETMOUSECLICKLOCKTIME

0x2008

Retrieves the time delay before the primary mouse button is locked. The pvParam parameter must point to DWORD that receives the time delay, in milliseconds. This is only enabled if SPI_SETMOUSECLICKLOCK is set to TRUE. For more information, see About Mouse Input.

Windows 2000:  This parameter is not supported.

SPI_GETMOUSEKEYS

0x0036

Retrieves information about the MouseKeys accessibility feature. The pvParam parameter must point to a MOUSEKEYS structure that receives the information. Set the cbSize member of this structure and the uiParam parameter to sizeof(MOUSEKEYS).

SPI_GETMOUSESONAR

0x101C

Retrieves the state of the Mouse Sonar feature. The pvParam parameter must point to a BOOL variable that receives TRUE if enabled or FALSE otherwise. For more information, see About Mouse Input.

Windows 2000:  This parameter is not supported.

SPI_GETMOUSEVANISH

0x1020

Retrieves the state of the Mouse Vanish feature. The pvParam parameter must point to a BOOL variable that receives TRUE if enabled or FALSE otherwise. For more information, see About Mouse Input.

Windows 2000:  This parameter is not supported.

SPI_GETSCREENREADER

0x0046

Determines whether a screen reviewer utility is running. A screen reviewer utility directs textual information to an output device, such as a speech synthesizer or Braille display. When this flag is set, an application should provide textual information in situations where it would otherwise present the information graphically.

The pvParam parameter is a pointer to a BOOL variable that receives TRUE if a screen reviewer utility is running, or FALSE otherwise.

SPI_GETSERIALKEYS

0x003E

This parameter is not supported.

Windows Server 2003 and Windows XP/2000:  The user should control this setting through the Control Panel.

SPI_GETSHOWSOUNDS

0x0038

Determines whether the Show Sounds accessibility flag is on or off. If it is on, the user requires an application to present information visually in situations where it would otherwise present the information only in audible form. The pvParam parameter must point to a BOOL variable that receives TRUE if the feature is on, or FALSE if it is off.

Using this value is equivalent to calling GetSystemMetrics with SM_SHOWSOUNDS. That is the recommended call.

SPI_GETSOUNDSENTRY

0x0040

Retrieves information about the SoundSentry accessibility feature. The pvParam parameter must point to a SOUNDSENTRY structure that receives the information. Set the cbSize member of this structure and the uiParam parameter to sizeof(SOUNDSENTRY).

SPI_GETSTICKYKEYS

0x003A

Retrieves information about the StickyKeys accessibility feature. The pvParam parameter must point to a STICKYKEYS structure that receives the information. Set the cbSize member of this structure and the uiParam parameter to sizeof(STICKYKEYS).

SPI_GETTOGGLEKEYS

0x0034

Retrieves information about the ToggleKeys accessibility feature. The pvParam parameter must point to a TOGGLEKEYS structure that receives the information. Set the cbSize member of this structure and the uiParam parameter to sizeof(TOGGLEKEYS).

SPI_SETACCESSTIMEOUT

0x003D

Sets the time-out period associated with the accessibility features. The pvParam parameter must point to an ACCESSTIMEOUT structure that contains the new parameters. Set the cbSize member of this structure and the uiParam parameter to sizeof(ACCESSTIMEOUT).

SPI_SETAUDIODESCRIPTION

0x0075

Turns the audio descriptions feature on or off. The pvParam parameter is a pointer to an AUDIODESCRIPTION structure.

While it is possible for users who are visually impaired to hear the audio in video content, there is a lot of action in video that does not have corresponding audio. Specific audio description of what is happening in a video helps these users understand the content better. This flag enables you to enable or disable audio descriptions in the languages they are provided in.

Windows Server 2003 and Windows XP/2000:  This parameter is not supported.

SPI_SETCLIENTAREAANIMATION

0x1043

Turns client area animations on or off. The pvParam parameter is a BOOL variable. Set pvParam to TRUE to disable animations and other transient effects in the client area, or FALSE to enable them.

Display features such as flashing, blinking, flickering, and moving content can cause seizures in users with photo-sensitive epilepsy. This flag enables you to enable or disable all such animations.

Windows Server 2003 and Windows XP/2000:  This parameter is not supported.

SPI_SETDISABLEOVERLAPPEDCONTENT

0x1041

Turns overlapped content (such as background images and watermarks) on or off. The pvParam parameter is a BOOL variable. Set pvParamto TRUE to disable overlapped content, or FALSE to enable overlapped content.

Display features such as background images, textured backgrounds, water marks on documents, alpha blending, and transparency can reduce the contrast between the foreground and background, making it harder for users with low vision to see objects on the screen. This flag enables you to enable or disable all such overlapped content.

Windows Server 2003 and Windows XP/2000:  This parameter is not supported.

SPI_SETFILTERKEYS

0x0033

Sets the parameters of the FilterKeys accessibility feature. The pvParam parameter must point to a FILTERKEYS structure that contains the new parameters. Set the cbSize member of this structure and the uiParam parameter to sizeof(FILTERKEYS).

SPI_SETFOCUSBORDERHEIGHT

0x2011

Sets the height of the top and bottom edges of the focus rectangle drawn with DrawFocusRect to the value of the pvParam parameter.

Windows 2000:  This parameter is not supported.

SPI_SETFOCUSBORDERWIDTH

0x200F

Sets the height of the left and right edges of the focus rectangle drawn with DrawFocusRect to the value of the pvParam parameter.

Windows 2000:  This parameter is not supported.

SPI_SETHIGHCONTRAST

0x0043

Sets the parameters of the HighContrast accessibility feature. The pvParam parameter must point to a HIGHCONTRAST structure that contains the new parameters. Set the cbSize member of this structure and the uiParam parameter to sizeof(HIGHCONTRAST).

SPI_SETMESSAGEDURATION

0x2017

Sets the time that notification pop-ups should be displayed, in seconds. The pvParam parameter specifies the message duration.

Users with visual impairments or cognitive conditions such as ADHD and dyslexia might need a longer time to read the text in notification messages. This flag enables you to set the message duration.

Windows Server 2003 and Windows XP/2000:  This parameter is not supported.

SPI_SETMOUSECLICKLOCK

0x101F

Turns the Mouse ClickLock accessibility feature on or off. This feature temporarily locks down the primary mouse button when that button is clicked and held down for the time specified by SPI_SETMOUSECLICKLOCKTIME. The pvParam parameter specifies TRUE for on, or FALSE for off. The default is off. For more information, see Remarks and AboutMouse Input.

Windows 2000:  This parameter is not supported.

SPI_SETMOUSECLICKLOCKTIME

0x2009

Adjusts the time delay before the primary mouse button is locked. The uiParam parameter should be set to 0. The pvParam parameter points to a DWORD that specifies the time delay in milliseconds. For example, specify 1000 for a 1 second delay. The default is 1200. For more information, see About Mouse Input.

Windows 2000:  This parameter is not supported.

SPI_SETMOUSEKEYS

0x0037

Sets the parameters of the MouseKeys accessibility feature. The pvParam parameter must point to a MOUSEKEYS structure that contains the new parameters. Set the cbSize member of this structure and the uiParam parameter to sizeof(MOUSEKEYS).

SPI_SETMOUSESONAR

0x101D

Turns the Sonar accessibility feature on or off. This feature briefly shows several concentric circles around the mouse pointer when the user presses and releases the CTRL key. The pvParam parameter specifies TRUE for on and FALSE for off. The default is off. For more information, see About Mouse Input.

Windows 2000:  This parameter is not supported.

SPI_SETMOUSEVANISH

0x1021

Turns the Vanish feature on or off. This feature hides the mouse pointer when the user types; the pointer reappears when the user moves the mouse. The pvParam parameter specifies TRUE for on and FALSE for off. The default is off. For more information, see About Mouse Input.

Windows 2000:  This parameter is not supported.

SPI_SETSCREENREADER

0x0047

Determines whether a screen review utility is running. The uiParam parameter specifies TRUE for on, or FALSE for off.

SPI_SETSERIALKEYS

0x003F

This parameter is not supported.

Windows Server 2003 and Windows XP/2000:  The user should control this setting through the Control Panel.

SPI_SETSHOWSOUNDS

0x0039

Turns the ShowSounds accessibility feature on or off. The uiParam parameter specifies TRUE for on, or FALSE for off.

SPI_SETSOUNDSENTRY

0x0041

Sets the parameters of the SoundSentry accessibility feature. The pvParam parameter must point to a SOUNDSENTRY structure that contains the new parameters. Set the cbSize member of this structure and the uiParam parameter to sizeof(SOUNDSENTRY).

SPI_SETSTICKYKEYS

0x003B

Sets the parameters of the StickyKeys accessibility feature. The pvParam parameter must point to a STICKYKEYS structure that contains the new parameters. Set the cbSize member of this structure and the uiParam parameter to sizeof(STICKYKEYS).

SPI_SETTOGGLEKEYS

0x0035

Sets the parameters of the ToggleKeys accessibility feature. The pvParam parameter must point to a TOGGLEKEYS structure that contains the new parameters. Set the cbSize member of this structure and the uiParam parameter to sizeof(TOGGLEKEYS).

 

The following are the desktop parameters.

Desktop parameterMeaning

SPI_GETCLEARTYPE

0x1048

Determines whether ClearType is enabled. The pvParam parameter must point to a BOOL variable that receives TRUE if ClearType is enabled, or FALSE otherwise.

ClearType is a software technology that improves the readability of text on liquid crystal display (LCD) monitors.

Windows Server 2003 and Windows XP/2000:  This parameter is not supported.

SPI_GETDESKWALLPAPER

0x0073

Retrieves the full path of the bitmap file for the desktop wallpaper. The pvParam parameter must point to a buffer to receive the null-terminated path string. Set the uiParam parameter to the size, in characters, of the pvParam buffer. The returned string will not exceed MAX_PATH characters. If there is no desktop wallpaper, the returned string is empty.

SPI_GETDROPSHADOW

0x1024

Determines whether the drop shadow effect is enabled. The pvParam parameter must point to a BOOL variable that returns TRUE if enabled or FALSE if disabled.

Windows 2000:  This parameter is not supported.

SPI_GETFLATMENU

0x1022

Determines whether native User menus have flat menu appearance. The pvParam parameter must point to a BOOL variable that returns TRUE if the flat menu appearance is set, or FALSE otherwise.

Windows 2000:  This parameter is not supported.

SPI_GETFONTSMOOTHING

0x004A

Determines whether the font smoothing feature is enabled. This feature uses font antialiasing to make font curves appear smoother by painting pixels at different gray levels.

The pvParam parameter must point to a BOOL variable that receives TRUE if the feature is enabled, or FALSE if it is not.

SPI_GETFONTSMOOTHINGCONTRAST

0x200C

Retrieves a contrast value that is used in ClearType smoothing. The pvParam parameter must point to a UINT that receives the information. Valid contrast values are from 1000 to 2200. The default value is 1400.

Windows 2000:  This parameter is not supported.

SPI_GETFONTSMOOTHINGORIENTATION

0x2012

Retrieves the font smoothing orientation. The pvParam parameter must point to a UINT that receives the information. The possible values are FE_FONTSMOOTHINGORIENTATIONBGR (blue-green-red) and FE_FONTSMOOTHINGORIENTATIONRGB (red-green-blue).

Windows XP/2000:  This parameter is not supported until Windows XP with SP2.

SPI_GETFONTSMOOTHINGTYPE

0x200A

Retrieves the type of font smoothing. The pvParam parameter must point to a UINT that receives the information. The possible values are FE_FONTSMOOTHINGSTANDARD and FE_FONTSMOOTHINGCLEARTYPE.

Windows 2000:  This parameter is not supported.

SPI_GETWORKAREA

0x0030

Retrieves the size of the work area on the primary display monitor. The work area is the portion of the screen not obscured by the system taskbar or by application desktop toolbars. The pvParam parameter must point to a RECT structure that receives the coordinates of the work area, expressed in virtual screen coordinates.

To get the work area of a monitor other than the primary display monitor, call the GetMonitorInfo function.

SPI_SETCLEARTYPE

0x1049

Turns ClearType on or off. The pvParam parameter is a BOOL variable. Set pvParam to TRUE to enable ClearType, or FALSE to disable it.

ClearType is a software technology that improves the readability of text on LCD monitors.

Windows Server 2003 and Windows XP/2000:  This parameter is not supported.

SPI_SETCURSORS

0x0057

Reloads the system cursors. Set the uiParam parameter to zero and the pvParam parameter to NULL.

SPI_SETDESKPATTERN

0x0015

Sets the current desktop pattern by causing Windows to read the Pattern= setting from the WIN.INI file.

SPI_SETDESKWALLPAPER

0x0014

Sets the desktop wallpaper. The value of the pvParam parameter determines the new wallpaper. To specify a wallpaper bitmap, set pvParamto point to a null-terminated string containing the full path to the bitmap file. Setting pvParam to "" removes the wallpaper. Setting pvParamto SETWALLPAPER_DEFAULT or NULL reverts to the default wallpaper.

The pvParam parameter can specify a .jpg file.

Windows Server 2003 and Windows XP/2000:  The pvParam parameter cannot specify a .jpg file.

SPI_SETDROPSHADOW

0x1025

Enables or disables the drop shadow effect. Set pvParam to TRUE to enable the drop shadow effect or FALSE to disable it. You must also have CS_DROPSHADOW in the window class style.

Windows 2000:  This parameter is not supported.

SPI_SETFLATMENU

0x1023

Enables or disables flat menu appearance for native User menus. Set pvParam to TRUE to enable flat menu appearance or FALSE to disable it.

When enabled, the menu bar uses COLOR_MENUBAR for the menubar background, COLOR_MENU for the menu-popup background, COLOR_MENUHILIGHT for the fill of the current menu selection, and COLOR_HILIGHT for the outline of the current menu selection. If disabled, menus are drawn using the same metrics and colors as in Windows 2000.

Windows 2000:  This parameter is not supported.

SPI_SETFONTSMOOTHING

0x004B

Enables or disables the font smoothing feature, which uses font antialiasing to make font curves appear smoother by painting pixels at different gray levels.

To enable the feature, set the uiParam parameter to TRUE. To disable the feature, set uiParam to FALSE.

SPI_SETFONTSMOOTHINGCONTRAST

0x200D

Sets the contrast value used in ClearType smoothing. The pvParam parameter is the contrast value. Valid contrast values are from 1000 to 2200. The default value is 1400.

SPI_SETFONTSMOOTHINGTYPE must also be set to FE_FONTSMOOTHINGCLEARTYPE.

Windows 2000:  This parameter is not supported.

SPI_SETFONTSMOOTHINGORIENTATION

0x2013

Sets the font smoothing orientation. The pvParam parameter is either FE_FONTSMOOTHINGORIENTATIONBGR (blue-green-red) or FE_FONTSMOOTHINGORIENTATIONRGB (red-green-blue).

Windows XP/2000:  This parameter is not supported until Windows XP with SP2.

SPI_SETFONTSMOOTHINGTYPE

0x200B

Sets the font smoothing type. The pvParam parameter is either FE_FONTSMOOTHINGSTANDARD, if standard anti-aliasing is used, or FE_FONTSMOOTHINGCLEARTYPE, if ClearType is used. The default is FE_FONTSMOOTHINGSTANDARD.

SPI_SETFONTSMOOTHING must also be set.

Windows 2000:  This parameter is not supported.

SPI_SETWORKAREA

0x002F

Sets the size of the work area. The work area is the portion of the screen not obscured by the system taskbar or by application desktop toolbars. The pvParam parameter is a pointer to a RECT structure that specifies the new work area rectangle, expressed in virtual screen coordinates. In a system with multiple display monitors, the function sets the work area of the monitor that contains the specified rectangle.

 

The following are the icon parameters.

Icon parameterMeaning

SPI_GETICONMETRICS

0x002D

Retrieves the metrics associated with icons. The pvParam parameter must point to an ICONMETRICS structure that receives the information. Set thecbSize member of this structure and the uiParam parameter to sizeof(ICONMETRICS).

SPI_GETICONTITLELOGFONT

0x001F

Retrieves the logical font information for the current icon-title font. The uiParam parameter specifies the size of a LOGFONT structure, and thepvParam parameter must point to the LOGFONT structure to fill in.

SPI_GETICONTITLEWRAP

0x0019

Determines whether icon-title wrapping is enabled. The pvParam parameter must point to a BOOL variable that receives TRUE if enabled, or FALSE otherwise.

SPI_ICONHORIZONTALSPACING

0x000D

Sets or retrieves the width, in pixels, of an icon cell. The system uses this rectangle to arrange icons in large icon view.

To set this value, set uiParam to the new value and set pvParam to NULL. You cannot set this value to less than SM_CXICON.

To retrieve this value, pvParam must point to an integer that receives the current value.

SPI_ICONVERTICALSPACING

0x0018

Sets or retrieves the height, in pixels, of an icon cell.

To set this value, set uiParam to the new value and set pvParam to NULL. You cannot set this value to less than SM_CYICON.

To retrieve this value, pvParam must point to an integer that receives the current value.

SPI_SETICONMETRICS

0x002E

Sets the metrics associated with icons. The pvParam parameter must point to an ICONMETRICS structure that contains the new parameters. Set thecbSize member of this structure and the uiParam parameter to sizeof(ICONMETRICS).

SPI_SETICONS

0x0058

Reloads the system icons. Set the uiParam parameter to zero and the pvParam parameter to NULL.

SPI_SETICONTITLELOGFONT

0x0022

Sets the font that is used for icon titles. The uiParam parameter specifies the size of a LOGFONT structure, and the pvParam parameter must point to a LOGFONT structure.

SPI_SETICONTITLEWRAP

0x001A

Turns icon-title wrapping on or off. The uiParam parameter specifies TRUE for on, or FALSE for off.

 

The following are the input parameters. They include parameters related to the keyboard, mouse, input language, and the warning beeper.

Input parameterMeaning

SPI_GETBEEP

0x0001

Determines whether the warning beeper is on.

The pvParam parameter must point to a BOOL variable that receives TRUE if the beeper is on, or FALSE if it is off.

SPI_GETBLOCKSENDINPUTRESETS

0x1026

Retrieves a BOOL indicating whether an application can reset the screensaver's timer by calling the SendInput function to simulate keyboard or mouse input. The pvParam parameter must point to a BOOL variable that receives TRUE if the simulated input will be blocked, or FALSE otherwise.

SPI_GETDEFAULTINPUTLANG

0x0059

Retrieves the input locale identifier for the system default input language. The pvParam parameter must point to an HKL variable that receives this value. For more information, see Languages, Locales, and Keyboard Layouts.

SPI_GETKEYBOARDCUES

0x100A

Determines whether menu access keys are always underlined. The pvParam parameter must point to a BOOL variable that receives TRUE if menu access keys are always underlined, and FALSE if they are underlined only when the menu is activated by the keyboard.

SPI_GETKEYBOARDDELAY

0x0016

Retrieves the keyboard repeat-delay setting, which is a value in the range from 0 (approximately 250 ms delay) through 3 (approximately 1 second delay). The actual delay associated with each value may vary depending on the hardware. The pvParam parameter must point to an integer variable that receives the setting.

SPI_GETKEYBOARDPREF

0x0044

Determines whether the user relies on the keyboard instead of the mouse, and wants applications to display keyboard interfaces that would otherwise be hidden. The pvParam parameter must point to a BOOL variable that receives TRUE if the user relies on the keyboard; or FALSE otherwise.

SPI_GETKEYBOARDSPEED

0x000A

Retrieves the keyboard repeat-speed setting, which is a value in the range from 0 (approximately 2.5 repetitions per second) through 31 (approximately 30 repetitions per second). The actual repeat rates are hardware-dependent and may vary from a linear scale by as much as 20%. The pvParam parameter must point to a DWORD variable that receives the setting.

SPI_GETMOUSE

0x0003

Retrieves the two mouse threshold values and the mouse acceleration. The pvParam parameter must point to an array of three integers that receives these values. See mouse_event for further information.

SPI_GETMOUSEHOVERHEIGHT

0x0064

Retrieves the height, in pixels, of the rectangle within which the mouse pointer has to stay for TrackMouseEvent to generate a WM_MOUSEHOVERmessage. The pvParam parameter must point to a UINT variable that receives the height.

SPI_GETMOUSEHOVERTIME

0x0066

Retrieves the time, in milliseconds, that the mouse pointer has to stay in the hover rectangle for TrackMouseEvent to generate aWM_MOUSEHOVER message. The pvParam parameter must point to a UINT variable that receives the time.

SPI_GETMOUSEHOVERWIDTH

0x0062

Retrieves the width, in pixels, of the rectangle within which the mouse pointer has to stay for TrackMouseEvent to generate a WM_MOUSEHOVERmessage. The pvParam parameter must point to a UINT variable that receives the width.

SPI_GETMOUSESPEED

0x0070

Retrieves the current mouse speed. The mouse speed determines how far the pointer will move based on the distance the mouse moves. ThepvParam parameter must point to an integer that receives a value which ranges between 1 (slowest) and 20 (fastest). A value of 10 is the default. The value can be set by an end-user using the mouse control panel application or by an application using SPI_SETMOUSESPEED.

SPI_GETMOUSETRAILS

0x005E

Determines whether the Mouse Trails feature is enabled. This feature improves the visibility of mouse cursor movements by briefly showing a trail of cursors and quickly erasing them.

The pvParam parameter must point to an integer variable that receives a value. If the value is zero or 1, the feature is disabled. If the value is greater than 1, the feature is enabled and the value indicates the number of cursors drawn in the trail. The uiParam parameter is not used.

Windows 2000:  This parameter is not supported.

SPI_GETSNAPTODEFBUTTON

0x005F

Determines whether the snap-to-default-button feature is enabled. If enabled, the mouse cursor automatically moves to the default button, such asOK or Apply, of a dialog box. The pvParam parameter must point to a BOOL variable that receives TRUE if the feature is on, or FALSE if it is off.

SPI_GETWHEELSCROLLCHARS

0x006C

Retrieves the number of characters to scroll when the horizontal mouse wheel is moved. The pvParam parameter must point to a UINT variable that receives the number of lines. The default value is 3.

SPI_GETWHEELSCROLLLINES

0x0068

Retrieves the number of lines to scroll when the vertical mouse wheel is moved. The pvParam parameter must point to a UINT variable that receives the number of lines. The default value is 3.

SPI_SETBEEP

0x0002

Turns the warning beeper on or off. The uiParam parameter specifies TRUE for on, or FALSE for off.

SPI_SETBLOCKSENDINPUTRESETS

0x1027

Determines whether an application can reset the screensaver's timer by calling the SendInput function to simulate keyboard or mouse input. TheuiParam parameter specifies TRUE if the screensaver will not be deactivated by simulated input, or FALSE if the screensaver will be deactivated by simulated input.

SPI_SETDEFAULTINPUTLANG

0x005A

Sets the default input language for the system shell and applications. The specified language must be displayable using the current system character set. The pvParam parameter must point to an HKL variable that contains the input locale identifier for the default language. For more information, see Languages, Locales, and Keyboard Layouts.

SPI_SETDOUBLECLICKTIME

0x0020

Sets the double-click time for the mouse to the value of the uiParam parameter. The double-click time is the maximum number of milliseconds that can occur between the first and second clicks of a double-click. You can also call the SetDoubleClickTime function to set the double-click time. To get the current double-click time, call the GetDoubleClickTime function.

SPI_SETDOUBLECLKHEIGHT

0x001E

Sets the height of the double-click rectangle to the value of the uiParam parameter.

The double-click rectangle is the rectangle within which the second click of a double-click must fall for it to be registered as a double-click.

To retrieve the height of the double-click rectangle, call GetSystemMetrics with the SM_CYDOUBLECLK flag.

SPI_SETDOUBLECLKWIDTH

0x001D

Sets the width of the double-click rectangle to the value of the uiParam parameter.

The double-click rectangle is the rectangle within which the second click of a double-click must fall for it to be registered as a double-click.

To retrieve the width of the double-click rectangle, call GetSystemMetrics with the SM_CXDOUBLECLK flag.

SPI_SETKEYBOARDCUES

0x100B

Sets the underlining of menu access key letters. The pvParam parameter is a BOOL variable. Set pvParam to TRUE to always underline menu access keys, or FALSE to underline menu access keys only when the menu is activated from the keyboard.

SPI_SETKEYBOARDDELAY

0x0017

Sets the keyboard repeat-delay setting. The uiParam parameter must specify 0, 1, 2, or 3, where zero sets the shortest delay approximately 250 ms) and 3 sets the longest delay (approximately 1 second). The actual delay associated with each value may vary depending on the hardware.

SPI_SETKEYBOARDPREF

0x0045

Sets the keyboard preference. The uiParam parameter specifies TRUE if the user relies on the keyboard instead of the mouse, and wants applications to display keyboard interfaces that would otherwise be hidden; uiParam is FALSE otherwise.

SPI_SETKEYBOARDSPEED

0x000B

Sets the keyboard repeat-speed setting. The uiParam parameter must specify a value in the range from 0 (approximately 2.5 repetitions per second) through 31 (approximately 30 repetitions per second). The actual repeat rates are hardware-dependent and may vary from a linear scale by as much as 20%. If uiParam is greater than 31, the parameter is set to 31.

SPI_SETLANGTOGGLE

0x005B

Sets the hot key set for switching between input languages. The uiParam and pvParam parameters are not used. The value sets the shortcut keys in the keyboard property sheets by reading the registry again. The registry must be set before this flag is used. the path in the registry is

HKEY_CURRENT_USER\Keyboard Layout\Toggle

. Valid values are "1" = ALT+SHIFT, "2" = CTRL+SHIFT, and "3" = none.

SPI_SETMOUSE

0x0004

Sets the two mouse threshold values and the mouse acceleration. The pvParam parameter must point to an array of three integers that specifies these values. See mouse_event for further information.

SPI_SETMOUSEBUTTONSWAP

0x0021

Swaps or restores the meaning of the left and right mouse buttons. The uiParam parameter specifies TRUE to swap the meanings of the buttons, or FALSE to restore their original meanings.

To retrieve the current setting, call GetSystemMetrics with the SM_SWAPBUTTON flag.

SPI_SETMOUSEHOVERHEIGHT

0x0065

Sets the height, in pixels, of the rectangle within which the mouse pointer has to stay for TrackMouseEvent to generate a WM_MOUSEHOVERmessage. Set the uiParam parameter to the new height.

SPI_SETMOUSEHOVERTIME

0x0067

Sets the time, in milliseconds, that the mouse pointer has to stay in the hover rectangle for TrackMouseEvent to generate a WM_MOUSEHOVERmessage. This is used only if you pass HOVER_DEFAULT in the dwHoverTime parameter in the call to TrackMouseEvent. Set the uiParamparameter to the new time.

The time specified should be between USER_TIMER_MAXIMUM and USER_TIMER_MINIMUM. If uiParam is less than USER_TIMER_MINIMUM, the function will use USER_TIMER_MINIMUM. If uiParam is greater than USER_TIMER_MAXIMUM, the function will be USER_TIMER_MAXIMUM.

Windows Server 2003 and Windows XP:  The operating system does not enforce the use of USER_TIMER_MAXIMUM and USER_TIMER_MINIMUM until Windows Server 2003 with SP1 and Windows XP with SP2.

SPI_SETMOUSEHOVERWIDTH

0x0063

Sets the width, in pixels, of the rectangle within which the mouse pointer has to stay for TrackMouseEvent to generate a WM_MOUSEHOVERmessage. Set the uiParam parameter to the new width.

SPI_SETMOUSESPEED

0x0071

Sets the current mouse speed. The pvParam parameter is an integer between 1 (slowest) and 20 (fastest). A value of 10 is the default. This value is typically set using the mouse control panel application.

SPI_SETMOUSETRAILS

0x005D

Enables or disables the Mouse Trails feature, which improves the visibility of mouse cursor movements by briefly showing a trail of cursors and quickly erasing them.

To disable the feature, set the uiParam parameter to zero or 1. To enable the feature, set uiParam to a value greater than 1 to indicate the number of cursors drawn in the trail.

Windows 2000:  This parameter is not supported.

SPI_SETSNAPTODEFBUTTON

0x0060

Enables or disables the snap-to-default-button feature. If enabled, the mouse cursor automatically moves to the default button, such as OK orApply, of a dialog box. Set the uiParam parameter to TRUE to enable the feature, or FALSE to disable it. Applications should use the ShowWindowfunction when displaying a dialog box so the dialog manager can position the mouse cursor.

SPI_SETWHEELSCROLLCHARS

0x006D

Sets the number of characters to scroll when the horizontal mouse wheel is moved. The number of characters is set from the uiParam parameter.

SPI_SETWHEELSCROLLLINES

0x0069

Sets the number of lines to scroll when the vertical mouse wheel is moved. The number of lines is set from the uiParam parameter.

The number of lines is the suggested number of lines to scroll when the mouse wheel is rolled without using modifier keys. If the number is 0, then no scrolling should occur. If the number of lines to scroll is greater than the number of lines viewable, and in particular if it is WHEEL_PAGESCROLL (#defined as UINT_MAX), the scroll operation should be interpreted as clicking once in the page down or page up regions of the scroll bar.

 

The following are the menu parameters.

Menu parameterMeaning

SPI_GETMENUDROPALIGNMENT

0x001B

Determines whether pop-up menus are left-aligned or right-aligned, relative to the corresponding menu-bar item. The pvParam parameter must point to a BOOL variable that receives TRUE if right-aligned, or FALSE otherwise.

SPI_GETMENUFADE

0x1012

Determines whether menu fade animation is enabled. The pvParam parameter must point to a BOOL variable that receives TRUE when fade animation is enabled and FALSE when it isdisabled. If fade animation is disabled, menus use slide animation. This flag is ignored unless menu animation is enabled, which you can do using the SPI_SETMENUANIMATION flag. For more information, see AnimateWindow.

SPI_GETMENUSHOWDELAY

0x006A

Retrieves the time, in milliseconds, that the system waits before displaying a shortcut menu when the mouse cursor is over a submenu item. ThepvParam parameter must point to a DWORD variable that receives the time of the delay.

SPI_SETMENUDROPALIGNMENT

0x001C

Sets the alignment value of pop-up menus. The uiParam parameter specifies TRUE for right alignment, or FALSE for left alignment.

SPI_SETMENUFADE

0x1013

Enables or disables menu fade animation. Set pvParam to TRUE to enable the menu fade effect or FALSE to disable it. If fade animation is disabled, menus use slide animation. he The menu fade effect is possible only if the system has a color depth of more than 256 colors. This flag is ignored unless SPI_MENUANIMATION is also set. For more information, see AnimateWindow.

SPI_SETMENUSHOWDELAY

0x006B

Sets uiParam to the time, in milliseconds, that the system waits before displaying a shortcut menu when the mouse cursor is over a submenu item.

 

The following are the power parameters.

Beginning with Windows Server 2008 and Windows Vista, these power parameters are not supported. Instead, to determine the current display power state, an application should register for GUID_MONITOR_POWER_STATE notifications. To determine the current display power down time-out, an application should register for notification of changes to the GUID_VIDEO_POWERDOWN_TIMEOUT power setting. For more information, see Registering for Power Events.

Windows Server 2003 and Windows XP/2000:  To determine the current display power state, use the following power parameters.

Power parameterMeaning

SPI_GETLOWPOWERACTIVE

0x0053

This parameter is not supported.

Windows Server 2003 and Windows XP/2000:  Determines whether the low-power phase of screen saving is enabled. The pvParam parameter must point to a BOOL variable that receives TRUE if enabled, or FALSE if disabled. This flag is supported for 32-bit applications only.

SPI_GETLOWPOWERTIMEOUT

0x004F

This parameter is not supported.

Windows Server 2003 and Windows XP/2000:  Retrieves the time-out value for the low-power phase of screen saving. The pvParam parameter must point to an integer variable that receives the value. This flag is supported for 32-bit applications only.

SPI_GETPOWEROFFACTIVE

0x0054

This parameter is not supported. When the power-off phase of screen saving is enabled, the GUID_VIDEO_POWERDOWN_TIMEOUT power setting is greater than zero.

Windows Server 2003 and Windows XP/2000:  Determines whether the power-off phase of screen saving is enabled. The pvParam parameter must point to a BOOL variable that receives TRUE if enabled, or FALSE if disabled. This flag is supported for 32-bit applications only.

SPI_GETPOWEROFFTIMEOUT

0x0050

This parameter is not supported. Instead, check the GUID_VIDEO_POWERDOWN_TIMEOUT power setting.

Windows Server 2003 and Windows XP/2000:  Retrieves the time-out value for the power-off phase of screen saving. The pvParam parameter must point to an integer variable that receives the value. This flag is supported for 32-bit applications only.

SPI_SETLOWPOWERACTIVE

0x0055

This parameter is not supported.

Windows Server 2003 and Windows XP/2000:  Activates or deactivates the low-power phase of screen saving. Set uiParam to 1 to activate, or zero to deactivate. The pvParam parameter must be NULL. This flag is supported for 32-bit applications only.

SPI_SETLOWPOWERTIMEOUT

0x0051

This parameter is not supported.

Windows Server 2003 and Windows XP/2000:  Sets the time-out value, in seconds, for the low-power phase of screen saving. The uiParam parameter specifies the new value. The pvParam parameter must be NULL. This flag is supported for 32-bit applications only.

SPI_SETPOWEROFFACTIVE

0x0056

This parameter is not supported. Instead, set the GUID_VIDEO_POWERDOWN_TIMEOUT power setting.

Windows Server 2003 and Windows XP/2000:  Activates or deactivates the power-off phase of screen saving. Set uiParam to 1 to activate, or zero to deactivate. The pvParam parameter must be NULL. This flag is supported for 32-bit applications only.

SPI_SETPOWEROFFTIMEOUT

0x0052

This parameter is not supported. Instead, set the GUID_VIDEO_POWERDOWN_TIMEOUT power setting to a time-out value.

Windows Server 2003 and Windows XP/2000:  Sets the time-out value, in seconds, for the power-off phase of screen saving. The uiParam parameter specifies the new value. The pvParam parameter must be NULL. This flag is supported for 32-bit applications only.

 

The following are the screen saver parameters.

Screen saver parameterMeaning

SPI_GETSCREENSAVEACTIVE

0x0010

Determines whether screen saving is enabled. The pvParam parameter must point to a BOOL variable that receives TRUE if screen saving is enabled, or FALSE otherwise.

Windows 7, Windows Server 2008 R2, and Windows 2000:  The function returns TRUE even when screen saving is not enabled. For more information and a workaround, see KB318781.

SPI_GETSCREENSAVERRUNNING

0x0072

Determines whether a screen saver is currently running on the window station of the calling process. The pvParam parameter must point to a BOOLvariable that receives TRUE if a screen saver is currently running, or FALSE otherwise. Note that only the interactive window station, WinSta0, can have a screen saver running.

SPI_GETSCREENSAVESECURE

0x0076

Determines whether the screen saver requires a password to display the Windows desktop. The pvParam parameter must point to a BOOL variable that receives TRUE if the screen saver requires a password, or FALSE otherwise. The uiParam parameter is ignored.

Windows Server 2003 and Windows XP/2000:  This parameter is not supported.

SPI_GETSCREENSAVETIMEOUT

0x000E

Retrieves the screen saver time-out value, in seconds. The pvParam parameter must point to an integer variable that receives the value.

SPI_SETSCREENSAVEACTIVE

0x0011

Sets the state of the screen saver. The uiParam parameter specifies TRUE to activate screen saving, or FALSE to deactivate it.

SPI_SETSCREENSAVESECURE

0x0077

Sets whether the screen saver requires the user to enter a password to display the Windows desktop. The uiParam parameter is a BOOL variable. The pvParam parameter is ignored. Set uiParam to TRUE to require a password, or FALSE to not require a password.

Windows Server 2003 and Windows XP/2000:  This parameter is not supported.

SPI_SETSCREENSAVETIMEOUT

0x000F

Sets the screen saver time-out value to the value of the uiParam parameter. This value is the amount of time, in seconds, that the system must be idle before the screen saver activates.

 

The following are the time-out parameters for applications and services.

Time-out parameterMeaning

SPI_GETHUNGAPPTIMEOUT

0x0078

Retrieves the number of milliseconds that a thread can go without dispatching a message before the system considers it unresponsive. ThepvParam parameter must point to an integer variable that receives the value.

Windows Server 2008, Windows Vista, Windows Server 2003, and Windows XP/2000:  This parameter is not supported.

SPI_GETWAITTOKILLTIMEOUT

0x007A

Retrieves the number of milliseconds that the system waits before terminating an application that does not respond to a shutdown request. ThepvParam parameter must point to an integer variable that receives the value.

Windows Server 2008, Windows Vista, Windows Server 2003, and Windows XP/2000:  This parameter is not supported.

SPI_GETWAITTOKILLSERVICETIMEOUT

0x007C

Retrieves the number of milliseconds that the service control manager waits before terminating a service that does not respond to a shutdown request. The pvParam parameter must point to an integer variable that receives the value.

Windows Server 2008, Windows Vista, Windows Server 2003, and Windows XP/2000:  This parameter is not supported.

SPI_SETHUNGAPPTIMEOUT

0x0079

Sets the hung application time-out to the value of the uiParam parameter. This value is the number of milliseconds that a thread can go without dispatching a message before the system considers it unresponsive.

Windows Server 2008, Windows Vista, Windows Server 2003, and Windows XP/2000:  This parameter is not supported.

SPI_SETWAITTOKILLTIMEOUT

0x007B

Sets the application shutdown request time-out to the value of the uiParam parameter. This value is the number of milliseconds that the system waits before terminating an application that does not respond to a shutdown request.

Windows Server 2008, Windows Vista, Windows Server 2003, and Windows XP/2000:  This parameter is not supported.

SPI_SETWAITTOKILLSERVICETIMEOUT

0x007D

Sets the service shutdown request time-out to the value of the uiParam parameter. This value is the number of milliseconds that the system waits before terminating a service that does not respond to a shutdown request.

Windows Server 2008, Windows Vista, Windows Server 2003, and Windows XP/2000:  This parameter is not supported.

 

The following are the UI effects. The SPI_SETUIEFFECTS value is used to enable or disable all UI effects at once. This table contains the complete list of UI effect values.

UI effects parameterMeaning

SPI_GETCOMBOBOXANIMATION

0x1004

Determines whether the slide-open effect for combo boxes is enabled. The pvParam parameter must point to a BOOL variable that receives TRUE for enabled, or FALSE for disabled.

SPI_GETCURSORSHADOW

0x101A

Determines whether the cursor has a shadow around it. The pvParam parameter must point to a BOOL variable that receives TRUE if the shadow is enabled, FALSE if it is disabled. This effect appears only if the system has a color depth of more than 256 colors.

SPI_GETGRADIENTCAPTIONS

0x1008

Determines whether the gradient effect for window title bars is enabled. The pvParam parameter must point to a BOOL variable that receives TRUE for enabled, or FALSE for disabled. For more information about the gradient effect, see the GetSysColor function.

SPI_GETHOTTRACKING

0x100E

Determines whether hot tracking of user-interface elements, such as menu names on menu bars, is enabled. The pvParam parameter must point to a BOOL variable that receives TRUE for enabled, or FALSE for disabled.

Hot tracking means that when the cursor moves over an item, it is highlighted but not selected. You can query this value to decide whether to use hot tracking in the user interface of your application.

SPI_GETLISTBOXSMOOTHSCROLLING

0x1006

Determines whether the smooth-scrolling effect for list boxes is enabled. The pvParam parameter must point to a BOOL variable that receives TRUE for enabled, or FALSE for disabled.

SPI_GETMENUANIMATION

0x1002

Determines whether the menu animation feature is enabled. This master switch must be on to enable menu animation effects. The pvParamparameter must point to a BOOL variable that receives TRUE if animation is enabled and FALSE if it is disabled.

If animation is enabled, SPI_GETMENUFADE indicates whether menus use fade or slide animation.

SPI_GETMENUUNDERLINES

0x100A

Same as SPI_GETKEYBOARDCUES.

SPI_GETSELECTIONFADE

0x1014

Determines whether the selection fade effect is enabled. The pvParam parameter must point to a BOOL variable that receives TRUE if enabled or FALSE if disabled.

The selection fade effect causes the menu item selected by the user to remain on the screen briefly while fading out after the menu is dismissed.

SPI_GETTOOLTIPANIMATION

0x1016

Determines whether ToolTip animation is enabled. The pvParam parameter must point to a BOOL variable that receives TRUE if enabled or FALSE if disabled. If ToolTip animation is enabled, SPI_GETTOOLTIPFADE indicates whether ToolTips use fade or slide animation.

SPI_GETTOOLTIPFADE

0x1018

If SPI_SETTOOLTIPANIMATION is enabled, SPI_GETTOOLTIPFADE indicates whether ToolTip animation uses a fade effect or a slide effect. ThepvParam parameter must point to a BOOL variable that receives TRUE for fade animation or FALSE for slide animation. For more information on slide and fade effects, see AnimateWindow.

SPI_GETUIEFFECTS

0x103E

Determines whether UI effects are enabled or disabled. The pvParam parameter must point to a BOOL variable that receives TRUE if all UI effects are enabled, or FALSE if they are disabled.

SPI_SETCOMBOBOXANIMATION

0x1005

Enables or disables the slide-open effect for combo boxes. Set the pvParam parameter to TRUE to enable the gradient effect, or FALSE to disable it.

SPI_SETCURSORSHADOW

0x101B

Enables or disables a shadow around the cursor. The pvParam parameter is a BOOL variable. Set pvParam to TRUE to enable the shadow or FALSE to disable the shadow. This effect appears only if the system has a color depth of more than 256 colors.

SPI_SETGRADIENTCAPTIONS

0x1009

Enables or disables the gradient effect for window title bars. Set the pvParam parameter to TRUE to enable it, or FALSE to disable it. The gradient effect is possible only if the system has a color depth of more than 256 colors. For more information about the gradient effect, see theGetSysColor function.

SPI_SETHOTTRACKING

0x100F

Enables or disables hot tracking of user-interface elements such as menu names on menu bars. Set the pvParam parameter to TRUE to enable it, or FALSE to disable it.

Hot-tracking means that when the cursor moves over an item, it is highlighted but not selected.

SPI_SETLISTBOXSMOOTHSCROLLING

0x1007

Enables or disables the smooth-scrolling effect for list boxes. Set the pvParam parameter to TRUE to enable the smooth-scrolling effect, or FALSE to disable it.

SPI_SETMENUANIMATION

0x1003

Enables or disables menu animation. This master switch must be on for any menu animation to occur. The pvParam parameter is a BOOLvariable; set pvParam to TRUE to enable animation and FALSE to disable animation.

If animation is enabled, SPI_GETMENUFADE indicates whether menus use fade or slide animation.

SPI_SETMENUUNDERLINES

0x100B

Same as SPI_SETKEYBOARDCUES.

SPI_SETSELECTIONFADE

0x1015

Set pvParam to TRUE to enable the selection fade effect or FALSE to disable it.

The selection fade effect causes the menu item selected by the user to remain on the screen briefly while fading out after the menu is dismissed. The selection fade effect is possible only if the system has a color depth of more than 256 colors.

SPI_SETTOOLTIPANIMATION

0x1017

Set pvParam to TRUE to enable ToolTip animation or FALSE to disable it. If enabled, you can use SPI_SETTOOLTIPFADE to specify fade or slide animation.

SPI_SETTOOLTIPFADE

0x1019

If the SPI_SETTOOLTIPANIMATION flag is enabled, use SPI_SETTOOLTIPFADE to indicate whether ToolTip animation uses a fade effect or a slide effect. Set pvParam to TRUE for fade animation or FALSE for slide animation. The tooltip fade effect is possible only if the system has a color depth of more than 256 colors. For more information on the slide and fade effects, see the AnimateWindowfunction.

SPI_SETUIEFFECTS

0x103F

Enables or disables UI effects. Set the pvParam parameter to TRUE to enable all UI effects or FALSE to disable all UI effects.

 

The following are the window parameters.

Window parameterMeaning

SPI_GETACTIVEWINDOWTRACKING

0x1000

Determines whether active window tracking (activating the window the mouse is on) is on or off. The pvParam parameter must point to aBOOL variable that receives TRUE for on, or FALSE for off.

SPI_GETACTIVEWNDTRKZORDER

0x100C

Determines whether windows activated through active window tracking will be brought to the top. The pvParam parameter must point to aBOOL variable that receives TRUE for on, or FALSE for off.

SPI_GETACTIVEWNDTRKTIMEOUT

0x2002

Retrieves the active window tracking delay, in milliseconds. The pvParam parameter must point to a DWORD variable that receives the time.

SPI_GETANIMATION

0x0048

Retrieves the animation effects associated with user actions. The pvParam parameter must point to an ANIMATIONINFO structure that receives the information. Set the cbSize member of this structure and the uiParam parameter to sizeof(ANIMATIONINFO).

SPI_GETBORDER

0x0005

Retrieves the border multiplier factor that determines the width of a window's sizing border. The pvParam parameter must point to an integer variable that receives this value.

SPI_GETCARETWIDTH

0x2006

Retrieves the caret width in edit controls, in pixels. The pvParam parameter must point to a DWORD variable that receives this value.

SPI_GETDOCKMOVING

0x0090

Determines whether a window is docked when it is moved to the top, left, or right edges of a monitor or monitor array. The pvParamparameter must point to a BOOL variable that receives TRUE if enabled, or FALSE otherwise.

Use SPI_GETWINARRANGING to determine whether this behavior is enabled.

Windows Server 2008, Windows Vista, Windows Server 2003, and Windows XP/2000:  This parameter is not supported.

SPI_GETDRAGFROMMAXIMIZE

0x008C

Determines whether a maximized window is restored when its caption bar is dragged. The pvParam parameter must point to a BOOL variable that receives TRUE if enabled, or FALSE otherwise.

Use SPI_GETWINARRANGING to determine whether this behavior is enabled.

Windows Server 2008, Windows Vista, Windows Server 2003, and Windows XP/2000:  This parameter is not supported.

SPI_GETDRAGFULLWINDOWS

0x0026

Determines whether dragging of full windows is enabled. The pvParam parameter must point to a BOOL variable that receives TRUE if enabled, or FALSE otherwise.

SPI_GETFOREGROUNDFLASHCOUNT

0x2004

Retrieves the number of times SetForegroundWindow will flash the taskbar button when rejecting a foreground switch request. The pvParamparameter must point to a DWORD variable that receives the value.

SPI_GETFOREGROUNDLOCKTIMEOUT

0x2000

Retrieves the amount of time following user input, in milliseconds, during which the system will not allow applications to force themselves into the foreground. The pvParam parameter must point to a DWORD variable that receives the time.

SPI_GETMINIMIZEDMETRICS

0x002B

Retrieves the metrics associated with minimized windows. The pvParam parameter must point to a MINIMIZEDMETRICS structure that receives the information. Set the cbSize member of this structure and the uiParam parameter to sizeof(MINIMIZEDMETRICS).

SPI_GETMOUSEDOCKTHRESHOLD

0x007E

Retrieves the threshold in pixels where docking behavior is triggered by using a mouse to drag a window to the edge of a monitor or monitor array. The default threshold is 1. The pvParam parameter must point to a DWORD variable that receives the value.

Use SPI_GETWINARRANGING to determine whether this behavior is enabled.

Windows Server 2008, Windows Vista, Windows Server 2003, and Windows XP/2000:  This parameter is not supported.

SPI_GETMOUSEDRAGOUTTHRESHOLD

0x0084

Retrieves the threshold in pixels where undocking behavior is triggered by using a mouse to drag a window from the edge of a monitor or a monitor array toward the center. The default threshold is 20.

Use SPI_GETWINARRANGING to determine whether this behavior is enabled.

Windows Server 2008, Windows Vista, Windows Server 2003, and Windows XP/2000:  This parameter is not supported.

SPI_GETMOUSESIDEMOVETHRESHOLD

0x0088

Retrieves the threshold in pixels from the top of a monitor or a monitor array where a vertically maximized window is restored when dragged with the mouse. The default threshold is 50.

Use SPI_GETWINARRANGING to determine whether this behavior is enabled.

Windows Server 2008, Windows Vista, Windows Server 2003, and Windows XP/2000:  This parameter is not supported.

SPI_GETNONCLIENTMETRICS

0x0029

Retrieves the metrics associated with the nonclient area of nonminimized windows. The pvParam parameter must point to aNONCLIENTMETRICS structure that receives the information. Set the cbSize member of this structure and the uiParam parameter tosizeof(NONCLIENTMETRICS).

SPI_GETPENDOCKTHRESHOLD

0x0080

Retrieves the threshold in pixels where docking behavior is triggered by using a pen to drag a window to the edge of a monitor or monitor array. The default is 30.

Use SPI_GETWINARRANGING to determine whether this behavior is enabled.

Windows Server 2008, Windows Vista, Windows Server 2003, and Windows XP/2000:  This parameter is not supported.

SPI_GETPENDRAGOUTTHRESHOLD

0x0086

Retrieves the threshold in pixels where undocking behavior is triggered by using a pen to drag a window from the edge of a monitor or monitor array toward its center. The default threshold is 30.

Use SPI_GETWINARRANGING to determine whether this behavior is enabled.

Windows Server 2008, Windows Vista, Windows Server 2003, and Windows XP/2000:  This parameter is not supported.

SPI_GETPENSIDEMOVETHRESHOLD

0x008A

Retrieves the threshold in pixels from the top of a monitor or monitor array where a vertically maximized window is restored when dragged with the mouse. The default threshold is 50.

Use SPI_GETWINARRANGING to determine whether this behavior is enabled.

Windows Server 2008, Windows Vista, Windows Server 2003, and Windows XP/2000:  This parameter is not supported.

SPI_GETSHOWIMEUI

0x006E

Determines whether the IME status window is visible (on a per-user basis). The pvParam parameter must point to a BOOL variable that receives TRUE if the status window is visible, or FALSE if it is not.

SPI_GETSNAPSIZING

0x008E

Determines whether a window is vertically maximized when it is sized to the top or bottom of a monitor or monitor array. The pvParamparameter must point to a BOOL variable that receives TRUE if enabled, or FALSE otherwise.

Use SPI_GETWINARRANGING to determine whether this behavior is enabled.

Windows Server 2008, Windows Vista, Windows Server 2003, and Windows XP/2000:  This parameter is not supported.

SPI_GETWINARRANGING

0x0082

Determines whether window arrangement is enabled. The pvParam parameter must point to a BOOL variable that receives TRUE if enabled, or FALSE otherwise.

Window arrangement reduces the number of mouse, pen, or touch interactions needed to move and size top-level windows by simplifying the default behavior of a window when it is dragged or sized.

The following parameters retrieve individual window arrangement settings:

SPI_GETDOCKMOVING

SPI_GETMOUSEDOCKTHRESHOLD

SPI_GETMOUSEDRAGOUTTHRESHOLD

SPI_GETMOUSESIDEMOVETHRESHOLD

SPI_GETPENDOCKTHRESHOLD

SPI_GETPENDRAGOUTTHRESHOLD

SPI_GETPENSIDEMOVETHRESHOLD

SPI_GETSNAPSIZING

Windows Server 2008, Windows Vista, Windows Server 2003, and Windows XP/2000:  This parameter is not supported.

SPI_SETACTIVEWINDOWTRACKING

0x1001

Sets active window tracking (activating the window the mouse is on) either on or off. Set pvParam to TRUE for on or FALSE for off.

SPI_SETACTIVEWNDTRKZORDER

0x100D

Determines whether or not windows activated through active window tracking should be brought to the top. Set pvParam to TRUE for on or FALSE for off.

SPI_SETACTIVEWNDTRKTIMEOUT

0x2003

Sets the active window tracking delay. Set pvParam to the number of milliseconds to delay before activating the window under the mouse pointer.

SPI_SETANIMATION

0x0049

Sets the animation effects associated with user actions. The pvParam parameter must point to an ANIMATIONINFO structure that contains the new parameters. Set the cbSize member of this structure and the uiParam parameter to sizeof(ANIMATIONINFO).

SPI_SETBORDER

0x0006

Sets the border multiplier factor that determines the width of a window's sizing border. The uiParam parameter specifies the new value.

SPI_SETCARETWIDTH

0x2007

Sets the caret width in edit controls. Set pvParam to the desired width, in pixels. The default and minimum value is 1.

SPI_SETDOCKMOVING

0x0091

Sets whether a window is docked when it is moved to the top, left, or right docking targets on a monitor or monitor array. Set pvParam to TRUE for on or FALSE for off.

SPI_GETWINARRANGING must be TRUE to enable this behavior.

Windows Server 2008, Windows Vista, Windows Server 2003, and Windows XP/2000:  This parameter is not supported.

SPI_SETDRAGFROMMAXIMIZE

0x008D

Sets whether a maximized window is restored when its caption bar is dragged. Set pvParam to TRUE for on or FALSE for off.

SPI_GETWINARRANGING must be TRUE to enable this behavior.

Windows Server 2008, Windows Vista, Windows Server 2003, and Windows XP/2000:  This parameter is not supported.

SPI_SETDRAGFULLWINDOWS

0x0025

Sets dragging of full windows either on or off. The uiParam parameter specifies TRUE for on, or FALSE for off.

SPI_SETDRAGHEIGHT

0x004D

Sets the height, in pixels, of the rectangle used to detect the start of a drag operation. Set uiParam to the new value. To retrieve the drag height, call GetSystemMetrics with the SM_CYDRAG flag.

SPI_SETDRAGWIDTH

0x004C

Sets the width, in pixels, of the rectangle used to detect the start of a drag operation. Set uiParam to the new value. To retrieve the drag width, call GetSystemMetrics with the SM_CXDRAG flag.

SPI_SETFOREGROUNDFLASHCOUNT

0x2005

Sets the number of times SetForegroundWindow will flash the taskbar button when rejecting a foreground switch request. Set pvParam to the number of times to flash.

SPI_SETFOREGROUNDLOCKTIMEOUT

0x2001

Sets the amount of time following user input, in milliseconds, during which the system does not allow applications to force themselves into the foreground. Set pvParam to the new time-out value.

The calling thread must be able to change the foreground window, otherwise the call fails.

SPI_SETMINIMIZEDMETRICS

0x002C

Sets the metrics associated with minimized windows. The pvParam parameter must point to a MINIMIZEDMETRICS structure that contains the new parameters. Set the cbSize member of this structure and the uiParam parameter to sizeof(MINIMIZEDMETRICS).

SPI_SETMOUSEDOCKTHRESHOLD

0x007F

Sets the threshold in pixels where docking behavior is triggered by using a mouse to drag a window to the edge of a monitor or monitor array. The default threshold is 1. The pvParam parameter must point to a DWORD variable that contains the new value.

SPI_GETWINARRANGING must be TRUE to enable this behavior.

Windows Server 2008, Windows Vista, Windows Server 2003, and Windows XP/2000:  This parameter is not supported.

SPI_SETMOUSEDRAGOUTTHRESHOLD

0x0085

Sets the threshold in pixels where undocking behavior is triggered by using a mouse to drag a window from the edge of a monitor or monitor array to its center. The default threshold is 20. The pvParam parameter must point to a DWORD variable that contains the new value.

SPI_GETWINARRANGING must be TRUE to enable this behavior.

Windows Server 2008, Windows Vista, Windows Server 2003, and Windows XP/2000:  This parameter is not supported.

SPI_SETMOUSESIDEMOVETHRESHOLD

0x0089

Sets the threshold in pixels from the top of the monitor where a vertically maximized window is restored when dragged with the mouse. The default threshold is 50. The pvParam parameter must point to a DWORD variable that contains the new value.

SPI_GETWINARRANGING must be TRUE to enable this behavior.

Windows Server 2008, Windows Vista, Windows Server 2003, and Windows XP/2000:  This parameter is not supported.

SPI_SETNONCLIENTMETRICS

0x002A

Sets the metrics associated with the nonclient area of nonminimized windows. The pvParam parameter must point to a NONCLIENTMETRICSstructure that contains the new parameters. Set the cbSize member of this structure and the uiParam parameter to sizeof(NONCLIENTMETRICS). Also, the lfHeight member of the LOGFONT structure must be a negative value.

SPI_SETPENDOCKTHRESHOLD

0x0081

Sets the threshold in pixels where docking behavior is triggered by using a pen to drag a window to the edge of a monitor or monitor array. The default threshold is 30. The pvParam parameter must point to a DWORD variable that contains the new value.

SPI_GETWINARRANGING must be TRUE to enable this behavior.

Windows Server 2008, Windows Vista, Windows Server 2003, and Windows XP/2000:  This parameter is not supported.

SPI_SETPENDRAGOUTTHRESHOLD

0x0087

Sets the threshold in pixels where undocking behavior is triggered by using a pen to drag a window from the edge of a monitor or monitor array to its center. The default threshold is 30. The pvParam parameter must point to a DWORD variable that contains the new value.

SPI_GETWINARRANGING must be TRUE to enable this behavior.

Windows Server 2008, Windows Vista, Windows Server 2003, and Windows XP/2000:  This parameter is not supported.

SPI_SETPENSIDEMOVETHRESHOLD

0x008B

Sets the threshold in pixels from the top of the monitor where a vertically maximized window is restored when dragged with a pen. The default threshold is 50. The pvParam parameter must point to a DWORD variable that contains the new value.

SPI_GETWINARRANGING must be TRUE to enable this behavior.

Windows Server 2008, Windows Vista, Windows Server 2003, and Windows XP/2000:  This parameter is not supported.

SPI_SETSHOWIMEUI

0x006F

Sets whether the IME status window is visible or not on a per-user basis. The uiParam parameter specifies TRUE for on or FALSE for off.

SPI_SETSNAPSIZING

0x008F

Sets whether a window is vertically maximized when it is sized to the top or bottom of the monitor. Set pvParam to TRUE for on or FALSE for off.

SPI_GETWINARRANGING must be TRUE to enable this behavior.

Windows Server 2008, Windows Vista, Windows Server 2003, and Windows XP/2000:  This parameter is not supported.

SPI_SETWINARRANGING

0x0083

Sets whether window arrangement is enabled. Set pvParam to TRUE for on or FALSE for off.

Window arrangement reduces the number of mouse, pen, or touch interactions needed to move and size top-level windows by simplifying the default behavior of a window when it is dragged or sized.

The following parameters set individual window arrangement settings:

SPI_SETDOCKMOVING

SPI_SETMOUSEDOCKTHRESHOLD

SPI_SETMOUSEDRAGOUTTHRESHOLD

SPI_SETMOUSESIDEMOVETHRESHOLD

SPI_SETPENDOCKTHRESHOLD

SPI_SETPENDRAGOUTTHRESHOLD

SPI_SETPENSIDEMOVETHRESHOLD

SPI_SETSNAPSIZING

Windows Server 2008, Windows Vista, Windows Server 2003, and Windows XP/2000:  This parameter is not supported.

 

uiParam [in]

Type: UINT

A parameter whose usage and format depends on the system parameter being queried or set. For more information about system-wide parameters, see the uiAction parameter. If not otherwise indicated, you must specify zero for this parameter.

pvParam [in, out]

Type: PVOID

A parameter whose usage and format depends on the system parameter being queried or set. For more information about system-wide parameters, see the uiAction parameter. If not otherwise indicated, you must specify NULL for this parameter.

fWinIni [in]

Type: UINT

If a system parameter is being set, specifies whether the user profile is to be updated, and if so, whether the WM_SETTINGCHANGE message is to be broadcast to all top-level windows to notify them of the change.

This parameter can be zero if you do not want to update the user profile or broadcast the WM_SETTINGCHANGE message, or it can be one or more of the following values.

ValueMeaning

SPIF_UPDATEINIFILE

Writes the new system-wide parameter setting to the user profile.

SPIF_SENDCHANGE

Broadcasts the WM_SETTINGCHANGE message after updating the user profile.

SPIF_SENDWININICHANGE

Same as SPIF_SENDCHANGE.

 

Return Value

Type: BOOL

If the function succeeds, the return value is a nonzero value.

If the function fails, the return value is zero. To get extended error information, call GetLastError.

Remarks

This function is intended for use with applications that allow the user to customize the environment.

A keyboard layout name should be derived from the hexadecimal value of the language identifier corresponding to the layout. For example, U.S. English has a language identifier of 0x0409, so the primary U.S. English layout is named "00000409". Variants of U.S. English layout, such as the Dvorak layout, are named "00010409", "00020409" and so on. For a list of the primary language identifiers and sublanguage identifiers that make up a language identifier, see the MAKELANGID macro.

There is a difference between the High Contrast color scheme and the High Contrast Mode. The High Contrast color scheme changes the system colors to colors that have obvious contrast; you switch to this color scheme by using the Display Options in the control panel. The High Contrast Mode, which uses SPI_GETHIGHCONTRAST and SPI_SETHIGHCONTRAST, advises applications to modify their appearance for visually-impaired users. It involves such things as audible warning to users and customized color scheme (using the Accessibility Options in the control panel). For more information, see HIGHCONTRAST. For more information on general accessibility features, see Accessibility.

During the time that the primary button is held down to activate the Mouse ClickLock feature, the user can move the mouse. After the primary button is locked down, releasing the primary button does not result in a WM_LBUTTONUP message. Thus, it will appear to an application that the primary button is still down. Any subsequent button message releases the primary button, sending a WM_LBUTTONUP message to the application, thus the button can be unlocked programmatically or through the user clicking any button.

Examples

The following example uses SystemParametersInfo to double the mouse speed.

#include <windows.h>#include <stdio.h>#pragma comment(lib, "user32.lib")void main(){   BOOL fResult;   int aMouseInfo[3];       // array for mouse information    // Get the current mouse speed.     fResult = SystemParametersInfo(      SPI_GETMOUSE,   // get mouse information       0,              // not used       &aMouseInfo,    // holds mouse information      0);             // not used       // Double it.     if( fResult )   {      aMouseInfo[2] = 2 * aMouseInfo[2];        // Change the mouse speed to the new value.        SystemParametersInfo(         SPI_SETMOUSE,      // set mouse information         0,                 // not used          aMouseInfo,        // mouse information          SPIF_SENDCHANGE);  // update win.ini    }}

Requirements

Minimum supported client

Windows 2000 Professional

Minimum supported server

Windows 2000 Server

Header

Winuser.h (include Windows.h)

Library

User32.lib

DLL

User32.dll

Unicode and ANSI names

SystemParametersInfoW (Unicode) and SystemParametersInfoA (ANSI)

See Also

ACCESSTIMEOUT

ANIMATIONINFO

AUDIODESCRIPTION

FILTERKEYS

HIGHCONTRAST

ICONMETRICS

LOGFONT

MAKELANGID

MINIMIZEDMETRICS

MOUSEKEYS

NONCLIENTMETRICS

RECT

SERIALKEYS

SOUNDSENTRY

STICKYKEYS

TOGGLEKEYS

WM_SETTINGCHANGE

 

 

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Build date: 5/3/2011