How to open a specific drive when you have two CD-ROM drives

Problem/Question/Abstract:

How to open a specific drive when you have two CD-ROM drives

Answer:

function IsDriveCD(Drive: Char): boolean;
var
  DrivePath: string;
begin
  DrivePath := Drive + ':\';
  Result := (GetDriveType(PChar(DrivePath)) = DRIVE_CDROM);
end;

function EjectCD(Drive: Char): boolean;
var
  mp: TMediaPlayer;
begin
  Result := false;
  if not IsDriveCD(Drive) then
    exit;
  mp := TMediaPlayer.Create(nil);
  try
    mp.Visible := false;
    mp.Parent := Application.Mainform;
    mp.Shareable := true;
    mp.DeviceType := dtCDAudio;
    mp.FileName := Drive + ':';
    mp.Open;
    mp.Eject;
    mp.Close;
  finally
    mp.Free;
  end;
end;