struct _TBBUTTON 结构；在win32和win64下进行条件编译

struct _TBBUTTON 结构

struct _TBBUTTON 结构是一个定义按钮相关信息的结构；具体原型为：

typedef struct _TBBUTTON {int iBitmap;// zero-based index of button image 从0开始的按钮图标索引int idCommand;  // command to be sent when button pressed 按钮按下时发送的命令BYTE fsState;   // button state--see below 按钮状态BYTE fsStyle;   // button style--see below 按钮风格DWORD dwData;   // application-defined value 用户自定义数据int iString;// zero-based index of button label string 从0开始的按钮标签索引} TBBUTTON;

The members are as follows:

iBitmap

Zero-based index of button image. NULL if no image for this button.

idCommand

Command identifier associated with the button. This identifier is sent in aWM_COMMAND message when the button is chosen. If the fsStyle member has theTBSTYLE_SEP value, this member must be zero.

fsState

Button state flags. It can be a combination of the values listed below:

• TBSTATE_CHECKED   The button has theTBSTYLE_CHECKED style and is being pressed.
  
  
• TBSTATE_ENABLED   The button accepts user input. A button that does not have this state does not accept user input and is grayed.
  
  
• TBSTATE_HIDDEN   The button is not visible and cannot receive user input.
  
  
• TBSTATE_INDETERMINATE   The button is grayed.
  
  
• TBSTATE_PRESSED   The button is being pressed.
  
  
• TBSTATE_WRAP   A line break follows the button. The button must also have theTBSTATE_ENABLED state.

fsStyle

Button style. It can be a combination of the values listed below:

• TBSTYLE_BUTTON   Creates a standard push button.
  
  
• TBSTYLE_CHECK   Creates a button that toggles between the pressed and unpressed states each time the user clicks it. The button has a different background color when it is in the pressed state. 
  
  
• TBSTYLE_CHECKGROUP   Creates a check button that stays pressed until another button in the group is pressed.
  
  
• TBSTYLE_GROUP   Creates a button that stays pressed until another button in the group is pressed.
  
  
• TBSTYLE_SEP   Creates a separator, providing a small gap between button groups. A button that has this style does not receive user input.

dwData

User-defined data.

iString

Zero-based index of the string to use as the button’s label.NULL if there is no string for this button.

在win32和win64下进行条件编译

  typedef struct _TBBUTTON {

        int iBitmap;

        int idCommand;

        BYTE fsState;

        BYTE fsStyle;

#ifdef _WIN64

        BYTE bReserved[6];          // padding for alignment

#elif defined(_WIN32)

        BYTE bReserved[2];          // padding for alignment

#endif

        DWORD_PTR dwData;

        INT_PTR iString;

    } TBBUTTON, NEAR* PTBBUTTON, *LPTBBUTTON;

从_TBBUTTON结构中我们可以看到不同的编译风格。