在C ++中解析协议缓冲区

我想将一些协议缓冲区写入套接字，然后从客户端读取回去。事情不起作用，所以我在对服务器进行编码后立即在服务器本身中编写了一些解码部分。您能否看一下下面的代码，然后告诉我我做错了什么？

（我必须使用arraystream和编码流，以便可以编写定界符）

int bytes_written = tData.ByteSize() + sizeof(google::protobuf::uint32);
google::protobuf::uint8 buffer[bytes_written];
memset(buffer, '\0', bytes_written);
google::protobuf::io::ArrayOutputStream aos(buffer,bytes_written);
google::protobuf::io::CodedOutputStream *coded_output = new google::protobuf::io::CodedOutputStream(&aos);
google::protobuf::uint32 size_  = tData.ByteSize();
coded_output->WriteVarint32(size_);

tData.SerializeToCodedStream(coded_output);

int sent_bytes = 0;
std::cout << buffer << std::endl;
if ( (sent_bytes = send(liveConnections.at(i), buffer, bytes_written, MSG_NOSIGNAL)) == -1 )
    liveConnections.erase(liveConnections.begin() + i);
else
    std::cout << "sent "  << sent_bytes << " bytes to " << i << std::endl;

delete coded_output;



////////////////


google::protobuf::uint8 __buffer[sizeof(google::protobuf::uint32)];
memset(__buffer, '\0', sizeof(google::protobuf::uint32));
memcpy (__buffer, buffer, sizeof(google::protobuf::uint32));

google::protobuf::uint32 __size = 0;

google::protobuf::io::ArrayInputStream ais(__buffer,sizeof(google::protobuf::uint32));
google::protobuf::io::CodedInputStream coded_input(&ais);
coded_input. ReadVarint32(&__size);
std::cout <<" size of payload is "<<__size << std::endl;

google::protobuf::uint8 databuffer[__size];
memset(databuffer, '\0', __size);
memcpy (databuffer, buffer+sizeof(google::protobuf::uint32), __size);    

std::cout << "databuffs " << "size " << __size << "  "<< databuffer << std::endl;
google::protobuf::io::ArrayInputStream array_input(databuffer,__size);
google::protobuf::io::CodedInputStream _coded_input(&array_input);
data_model::terminal_data* tData = new data_model::terminal_data();
if (!tData->ParseFromCodedStream(&_coded_input))
{
    std::cout << "data could not be parsed" << std::endl;     
}
else
{
    std::cout <<" SYMBOL --" << tData->symbol_name() << std::endl;
}
delete tData;

程序输出：

size of payload is 55
databuffs size 55  C109"056*    BANKNIFTY0���20140915@�J    145406340
data could not be parsed
C109"056*   BANKNIFTY0���20140915@�J    145406340