VC++ 获取鼠标状态,获取鼠标弹起消息

LRESULT CALLBACK TestProc(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam)
{
switch (msg)
{
case WM_LBUTTONDOWN: //左键按下
{
SetCapture(hwnd);
}
break;
case WM_MOUSEMOVE: //鼠标按下移动
{
if(GetCapture() ==  hwnd)
{
//鼠标按下并移动...
}
}
break;
case WM_LBUTTONUP: //左键弹起
{
if(GetCapture()  ==  hwnd)
ReleaseCapture(); //当前线程中的窗口释放鼠标捕获，并恢复通常的鼠标输入处理。
}
break;

return 0;
}

}