Got a bit of confusion with using stringstream and the CodedOutputStream of
protobuf. Essentially, for each packet i put in a packetid that is stored
inside a protobuf message, then i put in the actual contents which is also
a protobuf message.
This code used to work when i was creating an std::stringstream just like
you see below, and passing a pointer to it into this method and having it
use that. Now that I removed that functionality, for some reason the stream
is just entirely empty. The only thing I could think of is maybe the
protobuf stream doesn't flush itself out until the destructor is hit and
since that never happens until after the fact, it never gets flushed?
That was the only theory I could grab. Some tips would be great.
std::string serialize(google::protobuf::Message* message, uint32_t
packetType)
{
std::stringstream ss(std::stringstream::out |
std::stringstream::binary);
google::protobuf::io::OstreamOutputStream raw_out(&ss);
google::protobuf::io::CodedOutputStream coded_out(&raw_out);
std::string headerString;
// write packet header, containing type of message we're sending
PacketBuf::Packet p;
p.set_type(packetType);
p.SerializeToString(&headerString);
coded_out.WriteVarint32(headerString.size());
coded_out.WriteRaw(headerString.data(), headerString.size());
std::string contentsString;
// write actual contents
message->SerializeToString(&contentsString);
coded_out.WriteVarint32(contentsString.size());
coded_out.WriteString(contentsString);
assert(ss.str().size() > 0); // assertion is triggered :-(
return ss.str();
}
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