全局键盘钩子中如何判断CTRL+ALT+F12组合键被按下和弹起？

Question

LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam
{
//这里怎么判断？return CallNextHookEx(NULL,nCode, wParam, lParam );
}

Answer 1

可以这样：
当前键是ctrl时，检测atl  f12状态

Answer 2

LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
{
    if (wParam==VK_F12 && GetAsyncKeyState(
        VK_CONTROL)<0 && GetAsyncKeyState(
        VK_MENU)<0) {
        if (lParam & 0x80000000) {
            //CTRL+ALT+F12组合键弹起
        }
        else {
            //CTRL+ALT+F12组合键被按下
        }
    }    return CallNextHookEx(NULL,nCode, wParam, lParam );
}

Answer 3

http://msdn.microsoft.com/code/default.asp?url=/msdn-files/026/001/226/Source%20Files/DisableLowLevelKeys_cpp.asp