msgpack的数据序列和还原

msgpack的数据序列和还原

msgpack不仅可以序列一些常规的数据类型的数据，比如：string、datetime、integer。。。。。。

还能序列olevariant、stream

这就非常强大而完美了。

procedure TynTcpMethod.SendPicture(AReceiverID: string; APicture: TMemoryStream);
var
  LMsgPack: TSimpleMsgPack;
  LStream: TMemoryStream;
begin
  LMsgPack := TSimpleMsgPack.Create;
  LStream := TMemoryStream.Create;
  try
    LMsgPack.clear;
    LMsgPack.ForcePathObject('command').AsString := 'picture';
    LMsgPack.ForcePathObject('senderid').AsString := User.UserID;
    LMsgPack.ForcePathObject('sendername').AsString := User.UserName;
    LMsgPack.ForcePathObject('receiverid').AsString := AReceiverID;
    LMsgPack.ForcePathObject('picture').LoadBinaryFromStream(APicture);  // 流序列图片或文件
    LMsgPack.ForcePathObject('time').AsDateTime := Now;
    LMsgPack.EncodeToStream(LStream);
    LStream.Position := 0;
    IdTCPClient1.IOHandler.Write(LStream, LStream.Size, True);
  finally
    LMsgPack.Free;
    LStream.Free;
  end;
end;

procedure TynTcpMethod.RecvPicture;
var
  LUserMsg: TUserMsg;
  LMyMsg: TMyMSG;
begin
  if FMsgDict.TryGetValue(FMsgPack.ForcePathObject('senderid').AsString, LUserMsg) then  // 查字典
  begin
    LMyMsg.IsMSG := False;
    LMyMsg.IsFile := False;
    LMyMsg.IsPicture := True;
    LMyMsg.PictureStream := TMemoryStream.Create;
    FMsgPack.ForcePathObject('picture').SaveBinaryToStream(LMyMsg.PictureStream);

    LMyMsg.Time := FMsgPack.ForcePathObject('time').AsDateTime;
    LMyMsg.Command := FMsgPack.ForcePathObject('command').AsString;
    LMyMsg.SenderId := FMsgPack.ForcePathObject('senderid').AsString;
    LMyMsg.SenderName := FMsgPack.ForcePathObject('sendername').AsString;
    LMyMsg.ReceiverId := FMsgPack.ForcePathObject('receiverid').AsString;
    LUserMsg.EnQueue(LMyMsg);      // 消息入队
  end;
end;