How to obtain the correct physical size of the monitor?

Question

How can I get the size of the display in centimeters or inches?

This code does not always works correctly:

HDC hdc = CreateDC(_T(\"DISPLAY\"),dd.Devi         


        

Answer 1

You can request LOGPIXELSX from GetDeviceCaps to get the DPI for the display, though it will generally return 96. See also this MSDN article on writing DPI-aware apps.