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. Surface Slim Pen 2 sold separately.Using Farshid T's answer as a base works in every scaling factor, except for 125%. Tactile signals with Surface Slim Pen 2 can be experienced on some applications on Surface Pro 8 running Windows 11. Requires Dolby Atmos® encoded content and audio.Ħ. Requires Dolby Vision® encoded content and video.ĥ. See aka.ms/ Surface Battery Performance for details. Battery life varies significantly based on usage, network and feature configuration, signal strength, settings and other factors. Internet access required, ISP fees may apply.ģ. Please refer to this page for more details. Chatting via SMS is available in limited countries and will be made available to other geos on a rolling basis. Certain features require specific hardware. Pen storage and charging available on select Keyboards.Ģ. Only Surface Pro Signature Keyboard has Surface Slim Pen 2 storage and charging capabilities.ġ. Surface Pro Signature Keyboard and Surface Pro Keyboard are sold separately. † Some accessories and software sold separately.

Surface pro 8 windows 11