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POC++ stl-based sending of binary serialized data for network transmission using sockets: Please, no Boost or Protobuf or such sw enthusiasts
 

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    <p>I need to send a number of complex objects over the network to a peer. I have written the code to serialize them using ostream and the operator&lt;&lt; for each class member in the objects that need to be serialized. The code I have written works successfully for serialization and network sending (htonl(), htons() etc. correctly used--I checked the aforementioned by writing to an ofstream (local file) in binary format (std::ios::bin). My next task, writing this binary data over the network socket, is where I am having issues.</p> <p>I have Socket class which translates std::string objects into C-style strings before sending them over the socket like so: </p> <pre><code>int Socket::send (const std::string goodies) const { status = ::send (socket, goodies.c_str(), goodies.size(), 0); return status; } </code></pre> <p>the same Socket class, which I use in the receiver, uses the recv() to place the incoming message into a std::string before passing it to the deserializing application:</p> <pre><code>int Socket::recv (std::string&amp; goodies) { char buf [1024]; goodies = ""; memset (buf, 0, 1025); int status = ::recv (socket, buf, 1024, 0); if (status &lt; 0) { return -1; } else if (status == 0) { return 0; } else { goodies = buf; return status; } } </code></pre> <p>I do the sending using the following code:</p> <pre><code>ostringstream os (std::ios::binary); GiantObject giantComplexObjectWithWholeLoadOfOtherObjects; // Initialize and set up // giantComplexObjectWithWholeLoadOfOtherObjects. // The following call works well--I tested it by writing to ofstream locally (file) // and checked it out using a hex dump. // Now, of course, my intent is to send it over the network, so I write to // ostream&amp;: giantComplexObjectWithWholeLoadOfOtherObjects.serialize (os); std::string someStr = os.str(); // Get me the stream in std::string format mySocket.send(someStr); // Does not work--send sent correctly, but recv received 0 bytes </code></pre> <p>However, if I try:</p> <pre><code>std::string someStr ("Some silly string"); mySocket.send (someStr); // received by receiver (receiver is similar arch). </code></pre> <p>Thereby, something is not right about my call to send binary std::string to the socket. Any help is greatly appreciated. Once again, I do not want to use Boost, protobuf etc.</p> <p>PS: I have spent a considerable amount of time looking over the old posts here, and the first response these types of questions receive is to use Boost. Please--there are other non-Boost, non-Protobuf ways, and I want to understand those other ways. I do appreciate what Boost and Protobuf bring to the table, I just want to do this in the manner I have set up the code. Thanks for your understanding.</p> <p>Thanks for reading my long post.</p>
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