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Article #17740: How can I eject a CD-ROM in code?

 Question and Answer Database

FAQ2740D.txt   How can I eject a CD-ROM in code?
Category   :VCL
Platform    :All
Product    :All 32 bit  

Question:
How can I eject a CD-ROM in code?


Answer:
You can use the Windows API function GetDriveType() to test
if the drive is a CD-ROM  drive then use the TMediaPlayer 
(even if the CD is not an Audio CD) to eject the CD.

Example:

function IsDriveCD(Drive : char) : longbool;
var
  DrivePath : string;
begin
  DrivePath := Drive + ':\';
  result := LongBool(GetDriveType(PChar(DrivePath)) and DRIVE_CDROM);
end;

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

procedure TForm1.Button1Click(Sender: TObject);
begin
  if not EjectCD('D') then
    ShowMessage('Not A CD Drive');
end;


7/16/98 4:31:28 PM
 

Last Modified: 01-SEP-99