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#61: How can I read the vertical refresh rate of the display?

If you need retrieve the value of the vertical refresh rate of the your monitor, you can call the GetDeviceCaps API's function with VREFRESH parameter.

This feature are available on Windows NT platform only, so before using you must check the Windows version. For example,

var ov: TOSVersionInfo;
     vr: Integer;
  ov.dwOSVersionInfoSize := SizeOf(ov);
  if OV.dwPlatformID = VER_PLATFORM_WIN32_NT then
    vr := GetDeviceCaps(Form1.Canvas.Handle, VREFRESH);
    Label.Caption := 'Frequence: ' + IntToStr(vr) + ' Hz';

Published: January 19, 2000

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