TCP Server Socket Opening Fail in C++ - c++

Question

I am currently creating a program where I require a TCP server for communication with an android application. I have written and tested the TCP server as an individual project and it runs completely fine. When including this into a larger project, where I have other processes, it no longer opens the socket for listening.
My project is being created in Visual Studio 2017 and the libraries I am using are:
WS2_32.lib for the TCP
OpenCV for image processing
Libcurl for sending files to a database
ACTi SDK for pulling image feed from a camera
The TCP server code I have written is (taken from https://www.youtube.com/watch?v=WDn-htpBlnU&t=162s):
void TCPServer()
{
//Initalize winsock
WSADATA wsData;
WORD ver = MAKEWORD(2, 2);
int wsOk = WSAStartup(ver, &wsData);
if (wsOk != 0)
{
cerr << "Can't init winsock" << endl;
return;
}
//Create a socket
SOCKET listening = socket(AF_INET, SOCK_STREAM, 0);
if (listening == INVALID_SOCKET)
{
cerr << "Can't create socket" << endl;
return;
}
//Bind the socket to an ip address and port
sockaddr_in hint;
hint.sin_family = AF_INET;
hint.sin_port = htons(100);
hint.sin_addr.S_un.S_addr = INADDR_ANY; //Could use inet_pton()
bind(listening, (sockaddr*)&hint, sizeof(hint));
//Tell Winsock the socket is for listening
listen(listening, SOMAXCONN);
//Wait for a connection
sockaddr_in client;
int clientSize = sizeof(client);
SOCKET clientsocket = accept(listening, (sockaddr*)&client, &clientSize);
char host[NI_MAXHOST]; //Clients remote name
char service[NI_MAXHOST]; //Service the client is on
ZeroMemory(host, NI_MAXHOST);
ZeroMemory(service, NI_MAXHOST);
if (getnameinfo((sockaddr*)&client, sizeof(client), host, NI_MAXHOST, service, NI_MAXSERV, 0) == 0)
{
cout << host << "connected on port " << service << endl;
}
else {
inet_ntop(AF_INET, &client.sin_addr, host, NI_MAXHOST);
cout << host << " connected on port " << ntohs(client.sin_port) << endl;
}
//Close listening socket
closesocket(listening);
//While loop:accept and echo message back to client
char buf[4096];
while (true)
{
ZeroMemory(buf, 4096);
//Wait for client to send data
int bytesReceived = recv(clientsocket, buf, 4096, 0);
if (bytesReceived == SOCKET_ERROR)
{
cerr << "Error in recv()" << endl;
break;
}
if (bytesReceived == 0)
{
cout << "Client disconnected" << endl;
break;
}
cout << buf << endl;
}
//Close the socket
closesocket(clientsocket);
//cleanup windsock
WSACleanup();
}
As I said, this code works as an individual project however, when I include this into my overall project the socket fails to open and a connection to 204.204.204.204 is instantly made. This was checked in both situations by viewing all open sockets with netstat. I feel this may be a library conflict, maybe between WS2_32 and libcurl, however I am unsure.
I am currently testing this by calling TCPServer() in my main, however I plan to run the server threaded along with my other processes.
Any suggestions as to why the socket may be failing to open would be much appreciated.

Answer 1

After carrying out checks on the function it was possible to narrow the failure down to the bind(...) function. It seems the error is down to having using namespace std;
The solution was to call bind from the global namespace by doing ::bind(...). This solution was found here: Compilation errors with socket bind function