Thread: multi-threaded chess using winsock

I've been working on a small network based chess application. I managed to create a server that can handle multiple connections, however I don't know how to send data from one client to another through the server. With this setup, it only send the message to one client.
I can also send you the solution file. Any help would be appreciated. Thanks

Here is the partial Server implementation;
Basically it creates new thread for each new client;

Code:

//function to handle our Socket on its own thread.
//param- SOCKET* that is connected to a client
DWORD WINAPI HandleSocket(void* param)
{
string test;

SOCKET s = (SOCKET)param;
User temp;
temp._socket = (SOCKET)param;
temp._inGame = false;
userlist.add(&temp);

std::cout<<"connection"<<endl;
int bytesread = 0;  
int byteswrite=0;

while(true)
{
    //receive
    bytesread = recv(s, reinterpret_cast<char*>(test.c_str()), BUF_LEN, 0);

    //error check   
    if(bytesread == SOCKET_ERROR)
    {
        std::cout << WSAGetLastError();
        //shutdown and close on error
        shutdown(s, SD_BOTH);
        closesocket(s);
        return 0;
    }


    //check for socket being closed by the client
    if(bytesread == 0)
    {
        //shutdown our socket, it closed
        shutdown(s, SD_BOTH);
        closesocket(s);
        return 0;
    }

    byteswrite = send(s, "test" , 255 , 0);
    if(byteswrite == SOCKET_ERROR)
    {
        std::cout << WSAGetLastError();
        //shutdown and close on error
        shutdown(s, SD_BOTH);
        closesocket(s);
        return 0;
    }

    test.clear();
 }
}

thanks for the answer I corrected those parts, but still don't know how to send a data from one client to another client through the server.

yes I know that, but the problem is recv() blocks the code, so its impossible to loop between different client sockets. it keeps waiting on the first client socket, which makes it impossible to receive data from others.

Originally Posted by akurdas

yes I know that, but the problem is recv() blocks the code, so its impossible to loop between different client sockets. it keeps waiting on the first client socket, which makes it impossible to receive data from others.

Look into either threads or making the socket asynchronous(using select).

I've been working on it since yesterday, but no result.
All the files are inside the attachment maybe someone can point me to the right direction. All I need to do is sending data from one client to another.

I know I have to communicate with all of the other client threads connected. What I don't know and need help with is how to communicate with all of the client threads to send the message out

Each user gets a new thread??