// Данная прога извлекает и закравет CD-ROM выбранные в Combobox1
// На форме разместите Button1, Button2 и Combobox1

uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, StdCtrls, ComCtrls, MMSystem;

type
  TForm1 = class(TForm)
    Button1: TButton;
    Button2: TButton;
    ComboBox1: TComboBox;
    procedure Button1Click(Sender: TObject);
    function CloseCD(Drive : string) : Boolean;
    function OpenCD(Drive : string) : Boolean;
    procedure FormCreate(Sender: TObject);
    procedure Button2Click(Sender: TObject);
  private
  public
end;

var
  Form1: TForm1;
  Driv: array [1..25] of string;

implementation

{$R *.dfm}

procedure TForm1.Button1Click(Sender: TObject);
begin
  OpenCD(ComboBox1.Text);
end;

function TForm1.OpenCD(Drive: string): Boolean;
var
  Res : MciError;
  OpenParm: TMCI_Open_Parms;
  Flags : DWord;
  S : string;
  DeviceID : Word;
begin
  Result:=false;
  S:=Drive;
  Flags:=mci_Open_Type or mci_Open_Element;
  with OpenParm do
  begin
    dwCallback := 0;
    lpstrDeviceType := 'CDAudio';
    lpstrElementName := PChar(S);
  end;
  Res := mciSendCommand(0, mci_Open, Flags, Longint(@OpenParm));
  if Res<>0 then
    exit;
  DeviceID:=OpenParm.wDeviceID;
  try
    Res:=mciSendCommand(DeviceID, MCI_SET, MCI_SET_DOOR_OPEN, 0);
    if Res=0 then
      exit;
    Result:=True;
  finally
    mciSendCommand(DeviceID, mci_Close, Flags, Longint(@OpenParm));
  end;
end;

function TForm1.CloseCD(Drive: string): Boolean;
var
  Res : MciError;
  OpenParm: TMCI_Open_Parms;
  Flags : DWord;
  S : string;
  DeviceID : Word;
begin
  Result:=false;
  S:=Drive;
  Flags:=mci_Open_Type or mci_Open_Element;
  with OpenParm do
  begin
    dwCallback := 0;
    lpstrDeviceType := 'CDAudio';
    lpstrElementName := PChar(S);
  end;
  Res := mciSendCommand(0, mci_Open, Flags, Longint(@OpenParm));
  if Res<>0 then
    exit;
  DeviceID:=OpenParm.wDeviceID;
  try
    Res:=mciSendCommand(DeviceID, MCI_SET, MCI_SET_DOOR_CLOSED, 0);
    if Res=0 then
      exit;
    Result:=True;
  finally
    mciSendCommand(DeviceID, mci_Close, Flags, Longint(@OpenParm));
  end;
end;

procedure TForm1.FormCreate(Sender: TObject);
var
  w:dword;
  Root:string;
  I, K:integer;
begin
  k:=0;
  w:=GetLogicalDrives;
  Root := '#:';
  for i := 0 to 25 do
  begin
    Root[1] := Char(Ord('A')+i);
    if (W and (1 shl i))>0 then
      if GetDriveType(Pchar(Root)) = DRIVE_CDROM then
      begin
        k:=k+1;
        Driv[k] := Root;
        ComboBox1.Items.Add(Driv[k]);
        ComboBox1.Text := Driv[1];
      end;
  end;
end;

procedure TForm1.Button2Click(Sender: TObject);
begin
  CloseCD(ComboBox1.Text);
end;

end.