peekmessage 产生重复消息，必然按下一次按键，两个消息

//handleMsg()
ExMessage msg;
while (peekmessage(&msg, EX_KEY,true)) {
     #控制台打印了两次，多次测试都是两次。加sleep 还是2次。是否重复分发了消息？
	std::cout << "PeekMessageA" << std::endl;
	unsigned char vkcode = msg.vkcode;



//main函数
hwnd = initgraph(WIDTH, HEIGHT, EX_SHOWCONSOLE);
while (1) {
	handleMsg();
	Sleep(1000);

}
system("pause");