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Detect a wheel of mouse

Use GetSystemMetrics function with SM_MOUSEWHEELPRESENT parameter.
Note: for Windows NT only.


procedure TForm1.Button1Click(Sender: TObject);
begin
  if GetSystemMetrics(SM_MOUSEWHEELPRESENT)<>0 then
    Label1.Caption:='You have a wheel'
  else
    Label1.Caption:='You have not a wheel';
end;

Related topics: Detect a mouse in the system
For more: Win32 prorammer's referenfe
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