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Use GetSystemMetrics WinAPI function with SM_CYHSCROLL and SM_CXVSCROLL parameters.

procedure TForm1.Button1Click(Sender: TObject);
begin
  Label1.Caption:='Height of a horizontal scroll bar = '+
    IntToStr(GetSystemMetrics(SM_CYHSCROLL))+' pixels';
  Label2.Caption:='Width of a vertical scroll bar = '+
    IntToStr(GetSystemMetrics(SM_CXVSCROLL))+' pixels';
end;

Related chapters

Manipulators

Related topics

Detect a mouse in the system
Detect a wheel of mouse

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Win32 programmer's reference

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