C++ ile Monitörü kapatmak

#include <windows.h>

using namespace std;

int main(int argc, char *argv[])
{
sendmessage(hwnd_broadcast, wm_syscommand, sc_monıtorpower, (lparam) 2);
sleep(5000);
sendmessage(hwnd_broadcast, wm_syscommand, sc_monıtorpower, (lparam) -1);
return 0;
}