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const ID_JPG = 0;
const ID_TEXT = 1;

procedure JPGSenden(Filename:String);
var Stream:TMemoryStream;
var FileStream:TFileStream;
var ID:Integer;
begin
  Stream:=TMemoryStream.Create;
  try
    //Identifikationsmerkmal in Stream schreiben
    ID:=ID_JPG;
    Stream.WriteBuffer(ID,SizeOf(ID));

    //Daten des Bildes in Memorystream speisen
    FileStream:=TFileStream.Create(FileName, fmOpenRead);
    try
      Stream.CopyFrom(FileStream,FileStream.Size);
    finally
      FileStream.Free;
    end;

    //Senden
    Client.SendStream(Stream);
  finally
    Stream.Free;
  end;
end;