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SetWindowsHookEx键盘将不会获取事件

wh-keyboard-ll setwindowshookex c#

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Nippysaurus · 技术社区 · 15 年前

我正在使用SetWindowsHookEx()创建键盘挂钩。创建似乎是成功的,但注册的过程从未被调用。我做错什么了吗?

#region Windows API Functions Declarations

[DllImport("user32.dll", CharSet = CharSet.Auto, CallingConvention = CallingConvention.StdCall)]
private static extern int SetWindowsHookEx(int idHook, HookProc lpfn, IntPtr hInstance, int threadId);

[DllImport("user32.dll", CharSet = CharSet.Auto, CallingConvention = CallingConvention.StdCall)]
private static extern bool UnhookWindowsHookEx(int idHook);

[DllImport("user32.dll", CharSet = CharSet.Auto, CallingConvention = CallingConvention.StdCall)]
private static extern int CallNextHookEx(int idHook, int nCode, IntPtr wParam, IntPtr lParam);

[DllImport("kernel32.dll", CharSet = CharSet.Auto, SetLastError = true)]
private static extern IntPtr GetModuleHandle(string lpModuleName);

#endregion

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private void CreateHook()
{
   int id_hook = (int)HookType.WH_KEYBOARD_LL;
   HookProc lpfn = new HookProc(this.KeyboardHookProc);

   using (ProcessModule curModule = Process.GetCurrentProcess().MainModule)
      hHook = SetWindowsHookEx(id_hook, lpfn, GetModuleHandle(curModule.ModuleName), 0);

   if (hHook == 0)
      throw new Exception("could not start monitoring mouse events");
}

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private int KeyboardHookProc(int code, IntPtr wParam, IntPtr lParam)
{
   if (code >= 0)
      Console.WriteLine((Keys)wParam.ToInt32());
   return CallNextHookEx(0, code, wParam, lParam);
}

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1 回复 | 直到 15 年前

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6

Hans Passant 15 年前

您的P/Invoke声明是错误的,您在需要IntPtr的地方使用int,并且混淆了idHook和hHook。在编辑代码后,这一点起到了作用:

IntPtr hHook;
private delegate IntPtr HookProc(int nCode, IntPtr wp, IntPtr lp);
HookProc lpfn;

private IntPtr KeyboardHookProc(int code, IntPtr wParam, IntPtr lParam) {
  if (code >= 0)
    Console.WriteLine((Keys)wParam.ToInt32());
  return CallNextHookEx(hHook, code, wParam, lParam);
}

private void CreateHook() {
  int id_hook = 13;
  lpfn = new HookProc(this.KeyboardHookProc);
  using (ProcessModule curModule = Process.GetCurrentProcess().MainModule)
    hHook = SetWindowsHookEx(id_hook, lpfn, GetModuleHandle(curModule.ModuleName), 0);
  if (hHook == IntPtr.Zero)
    throw new Exception("could not start monitoring mouse events");
}
[DllImport("user32.dll", CharSet = CharSet.Auto, CallingConvention = CallingConvention.StdCall)]
private static extern IntPtr SetWindowsHookEx(int idHook, HookProc lpfn, IntPtr hInstance, int threadId);
[DllImport("user32.dll", CharSet = CharSet.Auto, CallingConvention = CallingConvention.StdCall)]
private static extern bool UnhookWindowsHookEx(IntPtr hHook);
[DllImport("user32.dll", CharSet = CharSet.Auto, CallingConvention = CallingConvention.StdCall)]
private static extern IntPtr CallNextHookEx(IntPtr hHook, int nCode, IntPtr wParam, IntPtr lParam);
[DllImport("kernel32.dll", CharSet = CharSet.Auto, SetLastError = true)]
private static extern IntPtr GetModuleHandle(string lpModuleName);