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