Issue with non-blocking socket and getRemoteAddress()

[Romz]

I have an issue with socket::connect() and socket::getRemoteAddres() in non-blocking mode (SFML 2.1 32bits Windows 7).

I'm trying to use a non-blocking socket on my client, because I don't want it to block on connect() when there is no host listening on the chosen port, as it's called every frame.

Basically my update loop is something like this:

while (isRunning)
{
    Update();
    SendData();
}

void SendData()
{
    // try to connect
    // if connected then do some socket.send()
}
 

The problem is that getRemoteAddress doesn't return None, even though it is not connected.
The documentation states: It the socket is not connected, this function returns sf::IpAddress::None.
http://www.sfml-dev.org/documentation/2.1/classsf_1_1TcpSocket.php#a7904ca6ab9e018021e305a3aeb7a1b9a

Here is how to reproduce the problem/bug:

sf::TcpSocket socket;
sf::Socket::Status socketStatus = sf::Socket::Error;
while (true)
{
        if (socketStatus != sf::Socket::Done)
        {
                socket.disconnect();
                socket.setBlocking(false);
                socketStatus = socket.connect(viewerIPAddress, viewerPort);
                sf::IpAddress remoteAddr = socket.getRemoteAddress();
                printf("ip: %s\n", remoteAddr.toString().c_str()); // if it couldn't connect it should be None
        }
}
 

Not that this is not exactly the code I'm running, I don't have a while loop trying to connect again and again, it's done only once per SendData() call, but this simpler example showcases the problem.

I was relying on what documentation says to know if my socket was connected (so I could send the data or try again to connect, without blocking the execution of the program).

Thanks for the help.

[Laurent]

Thanks, I'll test it.

The problem is that getRemoteAddress doesn't return None, even though it is not connected.

So what does it return?

I was relying on what documentation says to know if my socket was connected

Why don't you rely on the return value of the connect function?

[Laurent]

You're right. While the socket is connecting (connection not failed yet), it returns the address and port it's trying to connect to, instead of None and 0.

I should update the documentation.

[Romz]

Thanks for the info.

I am now able to use non-blocking connect and blocking send.
I put my project (a real-time profiler/viewer) on github: https://github.com/shazbits/wiretap

Let me know if you want to list it somewhere. I added your libs (and license) to my repo, I hope that's ok with you.

Finally if you think something's not right with the way I connect/send, I'd appreciate any comments.
https://github.com/shazbits/wiretap/blob/326ef668afb0f434495f1945ee4459fb21a1ab0d/src/src/Profiler/WiretapProfiler.cpp#L57