HOOK 底层键盘消息---WH_KEYBOARD_LL

LRESULT CALLBACK LowLevelKeyboardProc (INT nCode, WPARAM wParam, LPARAM lParam)
{
	// By returning a non-zero value from the hook procedure, the
	// message does not get passed to the target window
	KBDLLHOOKSTRUCT *pkbhs = (KBDLLHOOKSTRUCT *)lParam;
	BOOL bControlKeyDown = 0;

	HWND hWnd = GetForegroundWindow();
	WCHAR szClassName[MAX_PATH] = {0};
	::GetClassName(hWnd, szClassName, MAX_PATH);

		switch (nCode)
		{
		case HC_ACTION:
			{
				// Check to see if the CTRL key is pressed
				bControlKeyDown = GetAsyncKeyState (VK_CONTROL) >> ((sizeof(SHORT) * 8) - 1);

				 //Disable CTRL+ESC
				if (pkbhs->vkCode == VK_ESCAPE && bControlKeyDown)
					return 1;

				 //Disable ALT+TAB
				if (pkbhs->vkCode == VK_TAB && pkbhs->flags & LLKHF_ALTDOWN)
					return 1;

				 //Disable ALT+ESC
				if (pkbhs->vkCode == VK_ESCAPE && pkbhs->flags & LLKHF_ALTDOWN)
					return 1;

				break;
			}

		default:
			break;
		}
		//MessageBoxA(NULL, "aaa", NULL, MB_OK);
		return 1;

}

void ChookKeyboardllDlg::OnBnClickedOk()
{
	// TODO: 在此添加控件通知处理程序代码
	Hook=(HHOOK)SetWindowsHookEx(WH_KEYBOARD_LL,(HOOKPROC)LowLevelKeyboardProc, theApp.m_hInstance,0); 
	//CDialogEx::OnOK();
}

void ChookKeyboardllDlg::OnBnClickedCancel()
{
	// TODO: 在此添加控件通知处理程序代码
	if(Hook)
	{
		BOOL result = UnhookWindowsHookEx((HHOOK)Hook); // 卸载钩子
		if (result) Hook = NULL;
	}
	//CDialogEx::OnCancel();
}