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Help => Network => Topic started by: D on January 17, 2011, 05:15:49 pm

Title: Usage of sf::Socket::Status in non-blocking sockets?
Post by: D on January 17, 2011, 05:15:49 pm

Hi. I'm using SFML2 in my project and non-blocking UDP socket. According to the API (http://www.sfml-dev.org/documentation/2.0/classsf_1_1Socket.htm#a51bf0fd51057b98a10fbb866246176dc), I should get enum code 1 (NotReady), when I send data when the previous data hasn't been completely sent yet, do I understand this correctly?

When I run the code (just sending data in a loop), on OS X, I get enum code 3 (Error) when the previous data hasn't been sent yet. On Windows, I get 0 (Done) all the time. Either there's a bug in the library, or I'm just understanding the whole thing wrong. Receiving works correctly afaik.

Title: Usage of sf::Socket::Status in non-blocking sockets?
Post by: Laurent on January 18, 2011, 08:04:22 am

Can you show a complete and minimal piece of code that reproduces this problem?

Title: Usage of sf::Socket::Status in non-blocking sockets?
Post by: D on January 18, 2011, 09:54:57 am

The following code:

Code: [Select]

#include <SFML/Network.hpp>
#include <iostream>

int main() {
  sf::IpAddress ip("localhost");
  sf::UdpSocket socket;
  sf::Packet packet;
  sf::Socket::Status socket_status = sf::Socket::Done;
  sf::Socket::Status receive_status = sf::Socket::Done;
  unsigned short port = 55555;

  socket.Bind(sf::UdpSocket::Socket::AnyPort);
  socket.SetBlocking(false);

  while (true) {
    socket_status = socket.Send(packet, ip, port);

    if (receive_status==0) {
      receive_status = socket.Receive(packet,ip,port);
      std::cout << "Received." << std::endl;
    }

    std::cout << "Socket status is: " << socket_status << std::endl;
    std::cout << "Receive status is: " << receive_status << std::endl;

    if (!socket_status==0)
      return 1;

    packet.Clear();
  }

}


Produces following output (on Mac OS X 10.6.6):

Code: [Select]

Socket status is: 0
Receive status is: 1
Socket status is: 3
Receive status is: 1


Strangely, I found out that if I comment out the receive part (even if it is not called even once), both statuses are always 0. I don't know how what output Windows does, because I don't have a Windows computer around, but I'll post it too later on, if needed. I didn't have any server running when doing this test, but it shouldn't affect the outcome, should it?

Is this a bug or is it my code? :) Thanks for your help.

Title: Usage of sf::Socket::Status in non-blocking sockets?
Post by: Laurent on January 18, 2011, 10:22:54 am

Ok I'll test that, thanks for the code. I'll try it on Linux, the network code is the same as on Mac OS X.

Title: Usage of sf::Socket::Status in non-blocking sockets?
Post by: D on January 31, 2011, 10:07:04 pm

Any news regarding to the issue?

Title: Usage of sf::Socket::Status in non-blocking sockets?
Post by: Laurent on February 01, 2011, 07:56:40 am

Not yet, sorry. There are so many things that I have to test... :cry: