在后台捕获键盘按键

您想要的是 全局热键 。

1. 在类的顶部导入所需的库：

   // DLL libraries used to manage hotkeys

   [Dllimport(“user32.dll”)]
   public static extern bool RegisterHotKey(IntPtr hWnd, int id, int fsModifiers, int vlc);
   [Dllimport(“user32.dll”)]
   public static extern bool UnregisterHotKey(IntPtr hWnd, int id);
   
   
   

2. 在类中添加一个字段，该字段将作为代码中热键的引用：

   const int MYACTION_HOTKEY_ID = 1;

3. 注册热键（例如，在Windows窗体的构造函数中）：

   // Modifier keys pres: Alt = 1, Ctrl = 2, Shift = 4, Win = 8

   // Compute the addition of each combination of the keys you want to be pressed
   // ALT+CTRL = 1 + 2 = 3 , CTRL+SHIFT = 2 + 4 = 6…
   RegisterHotKey(this.Handle, MYACTION_HOTKEY_ID, 6, (int) Keys.F12);

4. 通过在类中添加以下方法来处理键入的键：

   protected override void WndProc(ref Message m) {if (m.Msg == 0x0312 && m.WParam.ToInt32() == MYACTION_HOTKEY_ID) {    // My hotkey has been typed    // Do what you want here    // ...}base.WndProc(ref m);

   }