Visual C#弹出窗口杀手(2)

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上面的方法在性能上是不错的,因为他过滤了其他非IE的窗口.但是我们可以用一个更简单的方法来实现,就是调用API FindWindowEx(HWND hWndParent, HWND hWndNext, /*in*/LPCTSTR szClassName, /*in*/LPCTSTR szWindowTitle)方法.比较有用的是这句,我们可以使用registered window class name来找到IE窗口(IEFrame是所有打开的IE的标识).

 

protected void FindPopupToKill()

{

IntPtr hParent = IntPtr.Zero;

IntPtr hNext = IntPtr.Zero;

String sClassNameFilter = "IEFrame"; // 所有IE窗口的类

do

{ hNext = NativeWIN32.FindWindowEx(hParent,hNext,sClassNameFilter,IntPtr.Zero);

// we've got a hwnd to play with

if ( !hNext.Equals(IntPtr.Zero) )

{

// get window caption

NativeWIN32.STRINGBUFFER sLimitedLengthWindowTitle;

NativeWIN32.GetWindowText(hNext, out sLimitedLengthWindowTitle, 256);

String sWindowTitle = sLimitedLengthWindowTitle.szText;

if (sWindowTitle.Length>0)

{

// find this caption in the list of banned captions

foreach (ListViewItem item in listView1.Items)

{

if ( sWindowTitle.StartsWith(item.Text) )

NativeWIN32.SendMessage(hNext, NativeWIN32.WM_SYSCOMMAND,

NativeWIN32.SC_CLOSE,

IntPtr.Zero); // try soft kill

} }

} }

while (!hNext.Equals(IntPtr.Zero));

}

public class NativeWIN32

{ [DllImport("user32.dll", CharSet=CharSet.Auto)]

public static extern IntPtr FindWindowEx(IntPtr parent /*HWND*/,

IntPtr next /*HWND*/,

string sClassName,

IntPtr sWindowTitle);

}

注册系统热键

系统热键用在像弹出窗口杀手这种应用程序非常有用, Ctrl+Shift+J是缺省热键。

说道实现,我们继续用RegisterHotkey(HWND hWnd, int id, UINT fsModifiers, UINT vkey)。完成,代码如下:

public void SetHotKey(Keys c, bool bCtrl, bool bShift, bool bAlt, bool bWindows)

{

m_hotkey = c;

m_ctrlhotkey = bCtrl;

m_shifthotkey = bShift;

m_althotkey = bAlt;

m_winhotkey = bWindows;

// update hotkey

NativeWIN32.KeyModifiers modifiers = NativeWIN32.KeyModifiers.None;

if (m_ctrlhotkey)

modifiers |= NativeWIN32.KeyModifiers.Control;

if (m_shifthotkey)

modifiers |= NativeWIN32.KeyModifiers.Shift;

if (m_althotkey)

modifiers |= NativeWIN32.KeyModifiers.Alt;

if (m_winhotkey)

modifiers |= NativeWIN32.KeyModifiers.Windows;

NativeWIN32.RegisterHotKey(Handle, 100, modifiers, m_hotkey); //Keys.J);

}

一般的,注册热键要一下几步

/* ------- using HOTKEYs in a C# application -------

-- code snippet by James J Thompson --

在Form的load 中 : Ctrl+Shift+J

bool success = RegisterHotKey(Handle,

100,

KeyModifiers.Control | KeyModifiers.Shift,

Keys.J);

在 form的closing中 : UnregisterHotKey(Handle, 100); 

如何处理热键 :

protected override void WndProc( ref Message m )

{ const int WM_HOTKEY = 0x0312;

switch(m.Msg)

{ case WM_HOTKEY:

MessageBox.Show("Hotkey pressed");

ProcessHotkey();

break;

} base.WndProc(ref m );

}

public class NativeWIN32

{

[DllImport("user32.dll", SetLastError=true)]

public static extern bool RegisterHotKey( IntPtr hWnd, // handle to window

int id, // hot key identifier

KeyModifiers fsModifiers, // key-modifier options

Keys vk // virtual-key code

);

[DllImport("user32.dll", SetLastError=true)]

public static extern bool UnregisterHotKey( IntPtr hWnd, // handle to window

int id // hot key identifier

);

[Flags()]

public enum KeyModifiers

{

None = 0,

Alt = 1,

Control = 2,

Shift = 4,

Windows = 8

}

}

------- using HOTKEYs in a C# application ------- */

当我们按下热键以后,流程是这样:首先用HWND GetForegroundWindow()来得到窗体,然后要抓出窗体的标题, GetWindowText(HWND hwnd, /*out*/LPTSTR lpString, int nMaxCount). 具体如下:

protected void ProcessHotkey()

{ IntPtr hwnd = NativeWIN32.GetForegroundWindow();

if (!hwnd.Equals(IntPtr.Zero))

{ NativeWIN32.STRINGBUFFER sWindowTitle;

NativeWIN32.GetWindowText(hwnd, out sWindowTitle, 256);

if (sWindowTitle.szText.Length>0)

AddWindowTitle( sWindowTitle.szText ); // add to the ListView (Form)

} }
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