弹出窗口杀手(下)

答案：     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)
      }
  }
   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
  
   
   

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