...check if an audio-cd is in the cd drive?

function IsAudioCD(Drive: Char): Boolean;
var
  DrivePath: string;
  MaximumComponentLength: DWORD;
  FileSystemFlags: DWORD;
  VolumeName: string;
  OldErrorMode: UINT;
  DriveType: UINT;
begin
  Result := False;
  DrivePath := Drive + ':\';
  OldErrorMode := SetErrorMode(SEM_FAILCRITICALERRORS);
  try
    DriveType := GetDriveType(PChar(DrivePath));
  finally
    SetErrorMode(OldErrorMode);
  end;
  if DriveType <> DRIVE_CDROM then
    Exit;
  SetLength(VolumeName, 64);
  GetVolumeInformation(PChar(DrivePath),
    PChar(VolumeName),
    Length(VolumeName),
    nil,
    MaximumComponentLength,
    FileSystemFlags,
    nil,
    0);
  if lStrCmp(PChar(VolumeName), 'Audio-CD') = 0 then Result := True;
end;


procedure TForm1.Button1Click(Sender: TObject);
begin
  if IsAudioCD('D') then
    ShowMessage('Audio-CD found in drive D.')
  else
    ShowMessage('No Audio-CD found in drive D.');
end;

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