private int KeyboardHookProc(int nCode, Int32 wParam, IntPtr lParam)
{
// 侦听键盘事件
if ((nCode >= 0) && (KeyDownEvent != null || KeyUpEvent != null || KeyPressEvent != null))
{
KeyboardHookStruct MyKeyboardHookStruct = (KeyboardHookStruct)Marshal.PtrToStructure(lParam, typeof(KeyboardHookStruct));
// raise KeyDown
if (KeyDownEvent != null && (wParam == WM_KEYDOWN || wParam == WM_SYSKEYDOWN))
{
Keys keyData = (Keys)MyKeyboardHookStruct.vkCode;
System.Windows.Forms.KeyEventArgs e = new System.Windows.Forms.KeyEventArgs(keyData);
KeyDownEvent(this, e);
}
//键盘按下
if (KeyPressEvent != null && wParam == WM_KEYDOWN)
{
byte[] keyState = new byte[256];
GetKeyboardState(keyState);
byte[] inBuffer = new byte[2];
if (ToAscii(MyKeyboardHookStruct.vkCode, MyKeyboardHookStruct.scanCode, keyState, inBuffer, MyKeyboardHookStruct.flags) == 1)
{
KeyPressEventArgs e = new KeyPressEventArgs((char)inBuffer[0]);
KeyPressEvent(this, e);
}
}
// 键盘抬起
if (KeyUpEvent != null && (wParam == WM_KEYUP || wParam == WM_SYSKEYUP))
{
Keys keyData = (Keys)MyKeyboardHookStruct.vkCode;
System.Windows.Forms.KeyEventArgs e = new System.Windows.Forms.KeyEventArgs(keyData);
KeyUpEvent(this, e);
}
}
//如果返回1,则结束消息,这个消息到此为止,不再传递。
//如果返回0或调用CallNextHookEx函数则消息出了这个钩子继续往下传递,也就是传给消息真正的接受者
//return CallNextHookEx(hKeyboardHook, nCode, wParam, lParam);
return 0;
}
消息不放行,拦截消息后其他的程序就得不到消息了。