// 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
return DefWindowProc(hwnd, msg, wParam, lParam);
RECT rcMonitor = mi.rcMonitor; int width = rcMonitor.right - rcMonitor.left; int height = rcMonitor.bottom - rcMonitor.top; monitor default-monitor for windows 10 x64
return "Unknown";
// 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)
// Message loop to process system events MSG msg; while (true) // Wait for messages (with timeout to allow periodic rechecks) DWORD ret = MsgWaitForMultipleObjects(0, NULL, FALSE, 200, QS_ALLINPUT); if (ret == WAIT_OBJECT_0) while (PeekMessage(&msg, NULL, 0, 0, PM_REMOVE)) TranslateMessage(&msg); DispatchMessage(&msg);
// Callback for display settings changes LRESULT CALLBACK WndProc(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam) switch (msg) case WM_DISPLAYCHANGE: g_bChanged = TRUE; break; case WM_SETTINGCHANGE: if (wParam == SPI_SETWORKAREA) g_bChanged = TRUE; break; dpiY = 96
DEVMODE dm = GetCurrentDevMode(deviceName);