You're trying to send the raw C++ memory representation of a protocol object
  send(socket, &data_snd, sizeof(data_snd), 0)
That doesn't work. And is the reason why protocol buffers are there in
the first place: they provide serialization techniques.

You need to use the serialization methods that SerializeToStream or
SerializeToString that generate a platform independent string
serialization from the content of the protocol buffer. On the other
side deserialize with ParseFromString/ParseFromStream

  http://code.google.com/apis/protocolbuffers/docs/overview.html

-h
On Fri, Mar 12, 2010 at 09:29, mk <apollo...@gmail.com> wrote:
> Hi,
>
> I am trying to send a proto over a socket, but i am getting
> segmentation error.  Could someone please help and tell me what is
> wrong with this?
>
> file.proto
> message data{
>        required string x1 = 1;
>        required uint32 x2 = 2;
>        required float x3 = 3;
> }
>
> client.cpp
> ...
>    // class defined in proto
>    data data_snd;
>    data data_rec;
>
>    char *y1 = "operation1";
>    uint32_t y2 = 123 ;
>    float y3 = 3.14;
>
>    // assigning data to send()
>    data_snd.set_x1(y1);
>    data_snd.set_x2(y2);
>    data_snd.set_x3(y3);
>
>    //sending data to the server
>    if (send(socket, &data_snd, sizeof(data_snd), 0) < 0) {
>       cerr << "send() failed" ;
>       exit(1);
>     }
>
>     //receiving data from the client
>     if (recv(socket, &data_rcv, sizeof(data_rcv), 0) < 0) {
>        cerr << "recv() failed";
>        exit(1);
>     }
>
>     //printing received data
>     cout << data_rec.x1() << "\n";
>     cout << data_rec.x2() << "\n";
>     cout << data_rec.x3() << "\n";
> ...
>
> server.cpp
>  ...
>
>     //receiving data from the client
>     if (recv(socket, &data_rcv, sizeof(data_rcv), 0) < 0) {
>        cerr << "recv() failed";
>        exit(1);
>     }
>
>     //printing received data
>     cout << data_rec.x1() << "\n";
>     cout << data_rec.x2() << "\n";
>     cout << data_rec.x3() << "\n";
>
>   // assigning data to send()
>    data_snd.set_x1(data_rec.x1());
>    data_snd.set_x2(data_rec.x2());
>    data_snd.set_x3(data_rec.x3());
>
>    //sending data to the server
>    if (send(socket, &data_snd, sizeof(data_snd), 0) < 0) {
>       cerr << "send() failed" ;
>       exit(1);
>     }
> ...
>
> Thanks for help and replies-
>
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