linux - Parsing protocol buffers in c++ -


i wanted write protocol buffers socket , read client side. things didn't work wrote decoding part in server right after encoded it. can please take @ code below , tell me doing wrong ?

(i had use arraystream , coded stream can write delimiter)

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 " << << 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 "<<__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 not parsed" << std::endl;      } else {     std::cout <<" symbol --" << tdata->symbol_name() << std::endl; } delete tdata;

out put of program:

size of payload 55 databuffs size 55  c109"056*    banknifty0���20140915@�j    145406340 data not parsed c109"056*   banknifty0���20140915@�j    145406340

writevarint32 doesn't write 4 bytes, , readvarint32 doesn't read 4 bytes. "var" stands "variable", in "variable length encoding".

when encoding, write size (which can take little 1 byte), proto. when decoding, read size, advance 4 bytes, read proto. so, parsing starting wrong offset.

use currentposition() after readvarint32 figure out how many bytes size indicator consumed. advance number of bytes.


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