按照上面的方法,我们每n妙使用KillPopup()来检查.比较遗憾的是我们无法使用安全代码来完成所有的工作. 我们可以使用 System.Diagnostics.Proces来检查所有的IE进程,然后得到主窗体.但是每一个IE进程可以打开好几个窗口,虽然每一个窗体都于一个进程相关,但是还没有办法来使每一个窗体于进程对应起来.
一个可行的办法使用System.Diagnostics.Process列举出所有的运行的进程,然后System.Diagnostics.ProcessThreadCollection 来得到他们的.Threads属性,为了得到thread Id,我们使用Win32 API EnumThreadWindows(DWORD threadId, WNDENUMPROC lpfn, LPARAM lParam) 来实现,这是一个回调(call back)函数,他可以列举出于进程相关的窗体. 当我们得到了窗体的句柄以后,我们可以使用另一个API函数 GetWindowText(HWND hwnd, /*out*/LPTSTR lpString, int nMaxCount)来得到窗体的标题,然后根据已经有的窗体,调用API函数SendMessage(HWND hWnd, int msg, int wParam, int lParam)来关闭窗口. 下面使演示代码
Process[] myProcesses = Process.GetProcessesByName("IEXPLORE");
foreach(Process myProcess in myProcesses)
{
FindPopupToKill(myProcess);
}
protected void FindPopupToKill(Process p)
{
// traverse all threads and enum all windows attached to the thread
foreach (ProcessThread t in p.Threads)
{
int threadId = t.Id;
NativeWIN32.EnumThreadProc callbackProc =
new NativeWIN32.EnumThreadProc(MyEnumThreadWindowsProc);
NativeWIN32.EnumThreadWindows(threadId, callbackProc, IntPtr.Zero /*lParam*/);
}
}
// callback used to enumerate Windows attached to one of the threads
bool MyEnumThreadWindowsProc(IntPtr hwnd, IntPtr lParam)
{
public const int WM_SYSCOMMAND = 0x0112;
public const int SC_CLOSE = 0xF060;
// get window caption
NativeWIN32.STRINGBUFFER sLimitedLengthWindowTitle;
NativeWIN32.GetWindowText(hwnd, out sLimitedLengthWindowTitle, 256);
String sWindowTitle = sLimitedLengthWindowTitle.szText;
if (sWindowTitle.Length==0) return true;
// find this caption in the list of banned captions
foreach (ListViewItem item in listView1.Items)
{
if ( sWindowTitle.StartsWith(item.Text) )
NativeWIN32.SendMessage(hwnd, NativeWIN32.WM_SYSCOMMAND,
NativeWIN32.SC_CLOSE,
IntPtr.Zero); // try soft kill
}
return true;
}
public class NativeWIN32
{
public delegate bool EnumThreadProc(IntPtr hwnd, IntPtr lParam);
[DllImport("user32.dll", CharSet=CharSet.Auto)]
public static extern bool EnumThreadWindows(int threadId, EnumThreadProc pfnEnum, IntPtr lParam);
// used for an output LPCTSTR parameter on a method call
[StructLayout(LayoutKind.Sequential, CharSet=CharSet.Auto)]
public struct STRINGBUFFER
{
[MarshalAs(UnmanagedType.ByValTStr, SizeConst=256)]
public string szText;
}
[DllImport("user32.dll", CharSet=CharSet.Auto)]
public static extern int GetWindowText(IntPtr hWnd, out STRINGBUFFER ClassName, int nMaxCount);
[DllImport("user32.dll", CharSet=CharSet.Auto)]
public static extern int SendMessage(IntPtr hWnd, int msg, int wParam, int lParam);
}
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);
}
代码下载: http://www.codeproject.com/useritems/popupkiller/popupkiller_src_update.zip
演示程序: http://www.codeproject.com/useritems/popupkiller/popupkiller_demo_update.zip
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)
}
}
