Как выдвинуть дверцу CD-ROM?

Code:

// 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.