Sleep(3000); //暂停3000ms
keybd_event('A', 0, 0, 0);//按下a键
//参数1:虚拟键码
//参数2:定义该键的硬件扫描码
//参数3:KEYEVENTF_KEYUP:若指定该值,该键将被释放;若未指定该值,该键将被按下
keybd_event('A', 0, KEYEVENTF_KEYUP, 0);//松开a键
//按组合键 shift+a
keybd_event(16, 0, 0, 0);//按下Shift键
keybd_event('A', 0, 0, 0);//按下a键
keybd_event('A', 0, KEYEVENTF_KEYUP, 0);//松开a键
keybd_event(16, 0, KEYEVENTF_KEYUP, 0);//松开Shift键