C++暂时关闭显示器

在VS2010新建win32空工程，加入C++代码：

#include <windows.h>

int APIENTRY WinMain(HINSTANCE hInstance,
                     HINSTANCE hPrevInstance,
                     LPSTR     lpCmdLine,
                     int       nCmdShow)
{
    SendMessage(FindWindow(0,0),WM_SYSCOMMAND,SC_MONITORPOWER,2);
    Sleep(5000);
    SendMessage(FindWindow(0,0),WM_SYSCOMMAND,SC_MONITORPOWER,-1);
    return 0;
}

#include <windows.h>

int APIENTRY WinMain(HINSTANCE hInstance,
                     HINSTANCE hPrevInstance,
                     LPSTR     lpCmdLine,
                     int       nCmdShow)
{
	SendMessage(FindWindow(0,0),WM_SYSCOMMAND,SC_MONITORPOWER,2);
	Sleep(5000);
	SendMessage(FindWindow(0,0),WM_SYSCOMMAND,SC_MONITORPOWER,-1);
	return 0;
}

显示器关闭5秒后自动打开。