{....} 

  private 
    procedure OpenMedia(WaveFile : string); 
    function GetStatus(StatusRequested : DWord) : longint; 
    procedure CloseMedia; 

{....} 

var 
  MyError, dwFlags: Longint; 
  FDeviceID : Word; 

{....} 

uses 
  MMSystem; 

{....} 

procedure TForm1.OpenMedia(WaveFile: string); 
var 
  MyOpenParms: TMCI_Open_Parms; 
begin 
  with MyOpenParms do 
  begin 
    dwCallback       := Handle; // TForm1.Handle 
    lpstrDeviceType  := PChar('WaveAudio'); 
    lpstrElementName := PChar(WaveFile); 
  end; {with MyOpenParms} 
  dwFlags := MCI_WAIT or MCI_OPEN_ELEMENT or MCI_OPEN_TYPE; 
  MyError := mciSendCommand(0, MCI_OPEN, dwFlags, Longint(@MyOpenParms)); 
  // one could use mciSendCommand(DevId, here to specify a particular device 
  if MyError = 0 then 
    FDeviceID := MyOpenParms.wDeviceID 
  else 
    raise Exception.Create('Open Failed'); 
end; 

function TForm1.GetStatus(StatusRequested: DWORD): Longint; 
var 
  MyStatusParms: TMCI_Status_Parms; 
begin 
  dwFlags := MCI_WAIT or MCI_STATUS_ITEM; 
  with MyStatusParms do 
  begin 
    dwCallback := Handle; 
    dwItem     := StatusRequested; 
  end; 
  MyError := mciSendCommand(FDeviceID, 
    MCI_STATUS, 
    MCI_WAIT or MCI_STATUS_ITEM, 
    Longint(@MyStatusParms)); 
  if MyError = 0 then 
    Result := MyStatusParms.dwReturn 
  else 
    raise Exception.Create('Status call to get status of ' + 
      IntToStr(StatusRequested) + ' Failed'); 
end; 

procedure TForm1.CloseMedia; 
var 
  MyGenParms: TMCI_Generic_Parms; 
begin 
  if FDeviceID > 0 then 
  begin 
    dwFlags := 0; 
    MyGenParms.dwCallback := Handle; // TForm1.Handle 
    MyError := mciSendCommand(FDeviceID, MCI_CLOSE, dwFlags, Longint(@MyGenParms)); 
    if MyError = 0 then 
      FDeviceID := 0 
    else 
    begin 
      raise Exception.Create('Close Failed'); 
    end; 
  end; 
end; 


//Example: 
procedure TForm1.Button1Click(Sender: TObject); 
begin 
  if OpenDialog1.Execute then 
  begin 
    OpenMedia(OpenDialog1.FileName); 
    with ListBox1.Items do 
    begin 
      Add('Average Bytes / Sec : ' + IntToStr(GetStatus(MCI_WAVE_STATUS_AVGBYTESPERSEC))); 
      Add('Bits / Sample : ' + IntToStr(GetStatus(MCI_WAVE_STATUS_BITSPERSAMPLE))); 
      Add('Samples / Sec : ' + IntToStr(GetStatus(MCI_WAVE_STATUS_SAMPLESPERSEC))); 
      Add('Channels : ' + IntToStr(GetStatus(MCI_WAVE_STATUS_CHANNELS))); 
    end; 
    CloseMedia; 
  end; 
end;