To turn off monitor in Windows, SendMessage(HWND_BROADCAST, WM_SYSCOMMAND, SC_MONITORPOWER, (LPARAM)2) is most widely used.
Instead, we can use low-level monitor configuration functions.
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| /* 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); | |
| } |
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