Dekleration wird nicht erkannt?!?

[Poseidon]

Hallo Delphianer,

mit meiner neuen, selbestgemachten ( ) Komponente soll man die Lautstärke von TMediaplayer verändern können. Hier der Code:

Code:

unit Component1;

interface

uses
  SysUtils, Classes, mmsystem, mplayer, Windows;

   const
   MCI_SETAUDIO = $0873;
   MCI_DGV_SETAUDIO_VOLUME = $4002;
   MCI_DGV_SETAUDIO_ITEM = $00800000;
   MCI_DGV_SETAUDIO_VALUE = $01000000;
   MCI_DGV_STATUS_VOLUME = $4019;

   type
   MCI_DGV_SETAUDIO_PARMS = record
     dwCallback: integer;
     dwItem: integer;
     dwValue: integer;
     dwOver: integer;
     lpstrAlgorithm: PChar;
     lpstrQuality: PChar;
   end;
type
   MCI_STATUS_PARMS = record
     dwCallback: integer;
     dwReturn: integer;
     dwItem: integer;
     dwTrack: integer;
   end;


type
  TMediaplayerVolume = class(TComponent)
  private
 
      FVolume: integer;
  FMediaplayer: TMediaplayer;

  //function MPGetVolume(MP: TMediaPlayer): Integer;
    { Private-Deklarationen }
  protected
    

    { Protected-Deklarationen }
  public
      
  function GetVolume : integer;
    { Public-Deklarationen }
  published
  property Volume : integer  read    FVolume  write FVolume;
  property Mediaplayer: TMediaplayer  read    FMediaplayer  write FMediaplayer;
    { Published-Deklarationen }
  end;

procedure Register;
 procedure MPSetVolume(MP: TMediaPlayer; Volume: Integer) ;
// procedure GetVolume;


implementation

procedure Register;
begin
  RegisterComponents('LPI', [TMediaplayerVolume]);
end;

 function GetVolume : integer;
begin
 MPSetVolume(FMediaPlayer, FVolume) ;
end;

  procedure MPSetVolume(MP: TMediaPlayer; Volume: Integer) ;
var
   p: MCI_DGV_SETAUDIO_PARMS;
begin
   p.dwCallback := 0;
   p.dwItem := MCI_DGV_SETAUDIO_VOLUME;
   p.dwValue := Volume;
   p.dwOver := 0;
   p.lpstrAlgorithm := nil;
   p.lpstrQuality := nil;
   mciSendCommand(MP.DeviceID, MCI_SETAUDIO, MCI_DGV_SETAUDIO_VALUE or MCI_DGV_SETAUDIO_ITEM, Cardinal(@p)) ;
end;

function MPGetVolume(MP: TMediaPlayer): Integer;
var
   p: MCI_STATUS_PARMS;
begin
   p.dwCallback := 0;
   p.dwItem := MCI_DGV_STATUS_VOLUME;
   mciSendCommand(MP.DeviceID, MCI_STATUS, MCI_STATUS_ITEM, Cardinal(@p)) ;
   Result := p.dwReturn;
end;



end.

In der function

Code:

function GetVolume : integer;
begin
 MPSetVolume(FMediaPlayer, FVolume) ;
end;

kennt Delphi FMediaplayer und FVolumen nicht . Dabei habe ich sie hier doch deklerirt

Code:

private
 
      FVolume: integer;
  FMediaplayer: TMediaplayer;

  //function MPGetVolume(MP: TMediaPlayer): Integer;
    { Private-Deklarationen }
  protected
    

    { Protected-Deklarationen }
  public
      
  function GetVolume : integer;
    { Public-Deklarationen }
  published
  property Volume : integer  read    FVolume  write FVolume;
  property Mediaplayer: TMediaplayer  read    FMediaplayer  write FMediaplayer;
    { Published-Deklarationen }
  end;

Hoffe es ist alles einleuchtend. Danke im voraus

mfg Poseidon