Monitor Default-monitor For Windows 10 X64 May 2026

// Get current DEVMODE for the given monitor (by device name) DEVMODE GetCurrentDevMode(const std::string& deviceName) DEVMODE dm = 0 ; dm.dmSize = sizeof(dm); std::wstring wDevice(deviceName.begin(), deviceName.end()); EnumDisplaySettingsW(wDevice.c_str(), ENUM_CURRENT_SETTINGS, &dm); return dm;

// Get DPI scale (Windows 10 per-monitor DPI) UINT dpiX = 96, dpiY = 96; HMONITOR hMonitor = MonitorFromPoint(pt, MONITOR_DEFAULTTOPRIMARY); if (hMonitor) HMONITOR hPrimary = MonitorFromWindow(GetDesktopWindow(), MONITOR_DEFAULTTOPRIMARY); if (hPrimary) dpiX = GetDpiForMonitor(hPrimary, MDT_EFFECTIVE_DPI); dpiY = dpiX; // usually same monitor default-monitor for windows 10 x64

int main() { std::cout << "Windows Default Monitor Watcher\n"; std::cout << "Monitoring for changes... (Press Ctrl+C to exit)\n\n"; // Get current DEVMODE for the given monitor

// Orientation std::string orientation = "Landscape"; if (dm.dmDisplayOrientation == DMDO_90 dm.dmSize = sizeof(dm)