Problem wegen/mit ID3Tags

[Nils_13]

Hi,

ich arbeite an meiner Playlist von dAmp. Ich habe jetzt ID3 Tags noch eingebaut. Wenn ich normal auf hinzufügen klicke und daraufhin auf die Playlist klicke, kommt der Fehler
'Mp3File
...
does not exist!'. Warum ? Ich habe diese Meldung eingebaut falls es Fehler gibt. Hier der Code.(wenn ich alle MP3 Dateien eines Ordners einfüge und auf eine Datei drauf klicke, kommt kein Fehler)

Delphi-Quellcode:

procedure FillID3TagInformation(mp3File:string; Title,Artist,Album,Year,Genre,Comment:TEdit);
var //fMP3: file of Byte;
    ID3 : TID3Rec;
    fmp3: TFileStream;
begin
  fmp3:=TFileStream.Create(mp3File, fmOpenRead);
  try
    fmp3.position:=fmp3.size-128;
    fmp3.Read(ID3,SizeOf(ID3));
  finally
    fmp3.free;
  end;

 { or the non Stream approach - as in ChangeID3Tag procedure
 try
   AssignFile(fMP3, mp3File);
   Reset(fMP3);
   try
     Seek(fMP3, FileSize(fMP3) - 128);
     BlockRead(fMP3, ID3, SizeOf(ID3));
   finally
   end;
 finally
   CloseFile(fMP3);
 end;
 }
 if ID3.Tag <> 'TAG' then begin
   Title.Text:='Wrong or no ID3 tag information';
   Artist.Text:='Wrong or no ID3 tag information';
   Album.Text:='Wrong or no ID3 tag information';
   Year.Text:='Wrong or no ID3 tag information';
   Genre.Text:='Wrong or no ID3 tag information';
   Comment.Text:='Wrong or no ID3 tag information';
 end else begin
   Title.Text:=ID3.Title;
   Artist.Text:=ID3.Artist;
   Album.Text:=ID3.Album;
   Year.Text:=ID3.Year;
   if ID3.Genre in [0..MaxID3Genre] then
     Genre.Text:=ID3Genre[ID3.Genre]
   else
     Genre.Text:=IntToStr(ID3.Genre);
   Comment.Text:=ID3.Comment
 end;
end;

procedure ChangeID3Tag(NewID3: TID3Rec; mp3FileName: string);
var
  fMP3: file of Byte;
  OldID3 : TID3Rec;
begin
  try
    AssignFile(fMP3, mp3FileName);
    Reset(fMP3);
    try
      Seek(fMP3, FileSize(fMP3) - 128);
      BlockRead(fMP3, OldID3, SizeOf(OldID3));
      if OldID3.Tag = 'TAG' then
        { Replace old tag }
        Seek(fMP3, FileSize(fMP3) - 128)
      else
        { Append tag to file because it doesn't exist }
        Seek(fMP3, FileSize(fMP3));
      BlockWrite(fMP3, NewID3, SizeOf(NewID3));
    finally
    end;
  finally
    CloseFile(fMP3);
  end;
end;

procedure FillMP3FileList(Folder: string; sl: TStrings);
var Rec : TSearchRec;
begin
 sl.Clear;
 if SysUtils.FindFirst(Folder + '*.mp3', faAnyFile, Rec) = 0 then
  try
    repeat
      sl.Add(Rec.Name);
    until SysUtils.FindNext(Rec) <> 0;
  finally
    SysUtils.FindClose(Rec);
  end;
end;

procedure TForm1.Label13Click(Sender: TObject); //importieren der Dateien aus einem Ordner 
var mp3Folder : string;
begin

 mp3Folder := BrowseDialog('Choose a folder with mp3 files', BIF_RETURNONLYFSDIRS);
 if mp3Folder = '' then Exit;

 txtFolder.Caption := mp3Folder;

 //fill the list box with mp3 files
 FillMP3FileList(mp3Folder, playlist.Items);
end;

function TForm1.BrowseDialog(const Title: string; const Flag: integer): string;
var
  lpItemID : PItemIDList;
  BrowseInfo : TBrowseInfo;
  DisplayName : array[0..MAX_PATH] of char;
  TempPath : array[0..MAX_PATH] of char;
begin
  Result:='';
  FillChar(BrowseInfo, sizeof(TBrowseInfo), #0);
  with BrowseInfo do begin
    hwndOwner := Application.Handle;
    pszDisplayName := @DisplayName;
    lpszTitle := PChar(Title);
    ulFlags := Flag;
  end;
  lpItemID := SHBrowseForFolder(BrowseInfo);
  if lpItemId <> nil then begin
    SHGetPathFromIDList(lpItemID, TempPath);
    Result := IncludeTrailingBackslash(TempPath);
    GlobalFreePtr(lpItemID);

end;

end;

procedure TForm1.playlistClick(Sender: TObject);
 var mp3File:string;
begin
if playlist.Items.Count=0 then exit;
  mp3File := Concat(txtFolder.Caption, playlist.Items.Strings[playlist.ItemIndex]);
  if not FileExists(mp3File) then begin
   ShowMessage('MP3 file '+#13#10+ mp3File +#13#10+'does not exist!');
   exit;
  end;
 FillID3TagInformation(mp3File, form2.edTitle, form2.edArtist, form2.edAlbum, form2.edYear, form2.edGenre, form2.edComment);
end;