Retrieving the active version of Windows or DOS

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Retrieving the active version of Windows or DOS

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Call the GetVersion Windows API function to return version information for Windows and DOS.
The function returns a LongInt which contains this information:

Byte #1 - Windows Version (Integer part)
Byte #2 - Windows Version (Fractional part)
Byte #3 - DOS Version (Fractional part)
Byte #4 - DOS Version (Integer part)

To display the versions in a Delphi form, create two Labels and add the following OnCreate event-handler:

procedure TForm1.FormCreate(Sender: TObject);
var
  Version : LongInt;
begin
  Version := GetVersion;
  Label1.Caption := 'Windows ' +
    IntToStr(LoByte(LoWord(Version))) + '.' +
    IntToStr(HiByte(LoWord(Version)));
  Label2.Caption := 'DOS ' +
    IntToStr(HiByte(HiWord(Version))) + '.' +
    IntToStr(LoByte(HiWord(Version)));
end;

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