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Article #17756: Does my CD-ROM Drive contain an Audio CD?

 Question and Answer Database

FAQ2756D.txt   Does my CD-ROM Drive contain an Audio CD?
Category   :VCL
Platform    :All
Product    :All 32 bit  

Question:
How can I tell if a given CD-ROM Drive contains an 
Audio CD?


Answer:
You can use the Windows API function GetDriveType() to 
test if the drive is a CD-ROM drive then use the Windows 
API function GetVolumeInformation() to test if the 
VolumeName is 'Audio CD'.

Example:

function IsAudioCD(Drive : char) : bool;
var
  DrivePath : string;
  MaximumComponentLength : DWORD;
  FileSystemFlags : DWORD;
  VolumeName : string;
begin
  Result := false;
  DrivePath := Drive + ':\';
  if GetDriveType(PChar(DrivePath)) <> 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;

function PlayAudioCD(Drive : char) : bool;
var
  mp : TMediaPlayer;
begin
  result := false;
  Application.ProcessMessages;
  if not IsAudioCD(Drive) then exit;
  mp := TMediaPlayer.Create(nil);
  mp.Visible := false;
  mp.Parent := Application.MainForm;
  mp.Shareable := true;
  mp.DeviceType := dtCDAudio;
  mp.FileName := Drive + ':';
  mp.Shareable := true;
  mp.Open;
  Application.ProcessMessages;
  mp.Play;
  Application.ProcessMessages;
  mp.Close;
  Application.ProcessMessages;
  mp.free;
  result := true;
end;

procedure TForm1.Button1Click(Sender: TObject);
begin
  if not PlayAudioCD('D') then
    ShowMessage('Not an Audio CD');
end;

7/16/98 4:31:28 PM
 

Last Modified: 01-SEP-99