GraphicsObject.Microsoft’s Surface Pro X and Surface Pro products are about to merge into a single device upon the launch of the Surface Pro 9, according to reports. Release the Handle and Dispose of the GraphicsObject object If requested as percentage - convert it Divide the Screen Heights to get the scaling factor and round it to two decimalsĭouble ScreenScalingFactor = Math.Round((double)PhysicalScreenHeight / (double)LogicalScreenHeight, 2) Int PhysicalScreenHeight = GetDeviceCaps(DeviceContextHandle, (int)DeviceCap.DESKTOPVERTRES) Int LogicalScreenHeight = GetDeviceCaps(DeviceContextHandle, (int)DeviceCap.VERTRES) Call GetDeviceCaps with the Handle to retrieve the Screen Height IntPtr DeviceContextHandle = GraphicsObject.GetHdc() Get Handle to the device context associated with this Graphics object Graphics GraphicsObject = Graphics.FromHwnd(IntPtr.Zero) Create Graphics object from the current windows handle Static double GetWindowsScreenScalingFactor(bool percentage = true) Public static extern int GetDeviceCaps(IntPtr hDC, int nIndex) Return GetDpiForWindow(windowHandle) / 96f įor this to work correctly on Windows 10 anniversary, you need to add an app.manifest to your C# project: Ī more complete version of Ric Gaudet's answer: Public float GetDisplayScaleFactor(IntPtr windowHandle) Static extern int GetDpiForWindow(IntPtr hWnd)

This is a very old question, but since Windows 8.1, one can use various other functions, like GetDpiForWindow do something nice for people who can't see very well. Int logpixelsy = GetDeviceCaps(desktop, (int)DeviceCap.LOGPIXELSY) įloat screenScalingFactor = (float)PhysicalScreenHeight / (float)LogicalScreenHeight įloat dpiScalingFactor = (float)logpixelsy / (float)96 Int PhysicalScreenHeight = GetDeviceCaps(desktop, (int)DeviceCap.DESKTOPVERTRES) Int LogicalScreenHeight = GetDeviceCaps(desktop, (int)DeviceCap.VERTRES) Static extern int GetDeviceCaps(IntPtr hdc, int nIndex) Īnd usage: Graphics g = Graphics.FromHwnd(IntPtr.Zero) Not sure why this is the case, but this code seems to work for any scale setting. I tested about 20 different scaling factors, and the DPI always returns as 96, except for when set at 125%, which returns a DPI of 120. Using Farshid T's answer as a base works in every scaling factor, except for 125%.

Surface pro x and windows 11