C# 实现窗口"绑架"

所谓"绑架"就是把其他Win32程序的窗体嵌入到我们托管的WinForm中.网上已经用很多java版和Delphi版还有WPF的.我在这里补充C#版的.
定义需要的Win32 API

[DllImport( " user32.dll " )]
private   static   extern   int  SetParent(IntPtr hWndChild,IntPtr hWndParent);

[DllImport( " user32.dll " )]
private   static   extern   bool  ShowWindowAsync(IntPtr hWnd, int  nCmdShow);

[DllImport( " user32.dll " , SetLastError  =   true )]
private   static   extern   bool  PostMessage(IntPtr hWnd, uint  Msg, int  wParam, int  lParam);

[DllImport( " user32.dll " , EntryPoint  =   " SetWindowPos " )]
private   static   extern   bool  SetWindowPos(IntPtr hWnd, int  hWndInsertAfter,
             int  X, int  Y, int  cx, int  cy, uint  uFlags);

[DllImport( " user32.dll " )]
private   static   extern   int  SendMessage(IntPtr hWnd, uint  Msg, int  wParam, int  lParam);

[DllImport( " user32.dll " , SetLastError  =   true , CharSet  =  CharSet.Auto)]
private   static   extern   uint  SetWindowLong(IntPtr hwnd,  int  nIndex,  uint  newLong);

[DllImport( " user32.dll " , SetLastError  =   true , CharSet  =  CharSet.Auto)]
private   static   extern   uint  GetWindowLong(IntPtr hwnd,  int  nIndex);

[DllImport( " user32.dll " , CharSet  =  CharSet.Auto)]
private   static   public   extern   bool  ShowWindow(IntPtr hWnd,  short  State);


private   const   int  HWND_TOP  =   0x0 ;
private   const   int  WM_COMMAND  =   0x0112 ;
private   const   int  WM_QT_PAINT  =   0xC2DC ;
private   const   int  WM_PAINT  =   0x000F ;
private   const   int  WM_SIZE  =   0x0005 ;
private   const   int  SWP_FRAMECHANGED  =   0x0020 ;

启动我们需要绑架的程序

private   void  Form1_Load( object  sender, EventArgs e)
{
    p  =   new  Process();
     // 需要启动的程序
    p.StartInfo.FileName  =   @" c:\windows\system32\notepad.exe " ;
     // 为了美观,启动的时候最小化程序
    p.StartInfo.WindowStyle  =  ProcessWindowStyle.Minimized;
     // 启动
    p.Start();

     // 这里必须等待,否则启动程序的句柄还没有创建,不能控制程序
    Thread.Sleep( 1000 );
     // 最大化启动的程序
    ShowWindow(p.MainWindowHandle, ( short )ShowWindowStyles.SW_MAXIMIZE);
     // 设置被绑架程序的父窗口
    SetParent(p.MainWindowHandle,  this .Handle);
     // 改变尺寸
    ResizeControl();
}
// 控制嵌入程序的位置和尺寸
private   void  ResizeControl()
{
    SendMessage(p.MainWindowHandle, WM_COMMAND, WM_PAINT,  0 );
    PostMessage(p.MainWindowHandle, WM_QT_PAINT,  0 ,  0 );

    SetWindowPos(
    p.MainWindowHandle,
      HWND_TOP,
       0 - 5 , // 设置偏移量,把原来窗口的菜单遮住
        0   -   41 ,
      ( int ) this .Width,
      ( int ) this .Height + 36 ,
      SWP_FRAMECHANGED);

    SendMessage(p.MainWindowHandle, WM_COMMAND, WM_SIZE,  0 );
}

private   void  Form1_SizeChanged( object  sender, EventArgs e)
{
    ResizeControl();

} 

需要注意的是:ResizeControl()方法很重要,否则达不到我们预期的效果.