Turn On / Off display monitor

SetMonitorPower.c

/* dependencies */
#pragma comment(lib, "dxva2")
#pragma comment(lib, "user32")
#include <lowlevelmonitorconfigurationapi.h>

typedef struct _MONITORPOWERPARAM
{
	LPCWSTR szPhysicalMonitorDescription;
	BOOL bPowerOn;
} MONITOR_POWER_PARAM, *PMONITOR_POWER_PARAM;

BOOL CALLBACK _MonitorEnumProc(HMONITOR hMonitor, HDC hdcMonitor, LPRECT lprcMonitor, LPARAM lParam)
{
	UNREFERENCED_PARAMETER(hdcMonitor);
	UNREFERENCED_PARAMETER(lprcMonitor);

	DWORD dwMonitorCount;
	if (GetNumberOfPhysicalMonitorsFromHMONITOR(hMonitor, &dwMonitorCount))
	{
		PHYSICAL_MONITOR* pMons;

		if (pMons = HeapAlloc(GetProcessHeap(), 0, sizeof(PHYSICAL_MONITOR) * dwMonitorCount))
		{
			if (GetPhysicalMonitorsFromHMONITOR(hMonitor, dwMonitorCount, pMons))
			{
				for (DWORD i = 0; i < dwMonitorCount; i++)
				{
					if (lstrcmpiW(((PMONITOR_POWER_PARAM)lParam)->szPhysicalMonitorDescription, pMons[i].szPhysicalMonitorDescription) == 0)
					{
						SetVCPFeature(pMons[i].hPhysicalMonitor, 0xd6, ((PMONITOR_POWER_PARAM)lParam)->bPowerOn ? 1 : 4);
					}
					DestroyPhysicalMonitor(pMons[i].hPhysicalMonitor);
				}
			}

			HeapFree(GetProcessHeap(), 0, pMons);
		}
	}

	return TRUE;
}

VOID SetMonitorPower(LPCWSTR lpszPhysicalMonitorDescription, BOOL bPowerOn)
{
	MONITOR_POWER_PARAM lparam;
	lparam.szPhysicalMonitorDescription = lpszPhysicalMonitorDescription;
	lparam.bPowerOn = bPowerOn;
	EnumDisplayMonitors(NULL, NULL, _MonitorEnumProc, (LPARAM)&lparam);
}

void main()
{
	SetMonitorPower(L"Generic PnP Monitor", FALSE);
	Sleep(1000);
	SetMonitorPower(L"Generic PnP Monitor", TRUE);
}