使用RegisterHotKey检测Ctrl + V但不拦截它

Question

我需要检测用户何时按下Ctrl+ V(无论窗口焦点如何 - 我的应用程序可能会被最小化)但我不能停止实际的粘贴操作.

我尝试了一些事情:(我成功绑定了RegisterHotKey的键击)

我有:

protected override void WndProc(ref Message m)
{
  if (m.Msg == 0x312)
    hotKey();
  base.WndProc(ref m);
}

我尝试过以下方法:

void hotKey()
{
  SendKeys.SendWait("^v"); //just puts 'v' instead of clipboard contents
}

和

void hotKey()
{
  SendKeys.SendWait(ClipBoard.GetText());
  /* This works, but since Ctrl is still down, it triggers
   * all the shortcut keys for the app, e.g. if the keyboard
   * contains 's' then instead of putting 's' in the app, it
   * calls Ctrl+S which makes the app think the user wants
   * to save.
   */
}

目前我唯一可行的解​​决方案是绑定不同的东西,例如Ctrl+ B然后调用,SendKeys.SendWait("^v");但这并不理想.

一个理想的解决方案是,如果我的窗口首先没有拦截击键,只是做出反应.

Answer 1

您可以通过使用SetWindowsHookEx()来利用钩子来实现此目的.

HHOOK WINAPI SetWindowsHookEx(
  __in  int idHook,
  __in  HOOKPROC lpfn,
  __in  HINSTANCE hMod,
  __in  DWORD dwThreadId
);

基本上,您可以设置一个低级键盘钩子:

_hookHandle = SetWindowsHookEx(
    WH_KEYBOARD_LL,
    KbHookProc,                   // Your keyboard handler
    (IntPtr)0,
    0);                           // Set up system-wide hook.

捕获系统范围的键盘事件.但它也允许您将这些键盘事件传递给其他应用程序.对于您的特定情况,您可以定义KbHookProc为:

private static int KbHookProc(int nCode, IntPtr wParam, IntPtr lParam)
{
    if (nCode >= 0) // This means we can intercept the event.
    {
        var hookStruct = (KbLLHookStruct)Marshal.PtrToStructure(
                lParam,
                typeof(KbLLHookStruct));

        // Quick check if Ctrl key is down. 
        // See GetKeyState() doco for more info about the flags.
        bool ctrlDown = 
                GetKeyState(VK_LCONTROL) != 0 ||
                GetKeyState(VK_RCONTROL) != 0;

        if (ctrlDown && hookStruct.vkCode == 0x56) // Ctrl+V
        {
            // Replace this with your custom action.
            Clipboard.SetText("Hi");
        }
    }

    // Pass to other keyboard handlers. Makes the Ctrl+V pass through.
    return CallNextHookEx(_hookHandle, nCode, wParam, lParam);
} 

我编写了一个快速而又脏的WinForms应用程序来说明这一点.有关完整的代码清单,请参阅http://pastebin.com/uCSvqwb4.