为什么 socket(AF_INET, SOCK_STREAM, 0) 返回 -1？

Question

I'm writing a socket c++ lib for TCP.
I'm compiling with GCC for x86_64-w64-mingw32.7.3.0 on windows 10.

When I try to build a socket I fail.

 listenSocket = socket(AF_INET, SOCK_STREAM, 0); if (listenSocket < 0) { std::cout << "ERROR: OPEN SOCKET" << listenSocket << std::endl; close(listenSocket); return; }

Getting the error.

ERROR: OPEN SOCKET-1

Seem a really basic operation, I don't really understand why this failed. Unfortunately, I don't have other information to debug it further.

Do you have some suggestions? Thank you in adavance.

Answer 1

If you write any socket based code in Windows , you need to start your application with WSAStartup() . Add it to your program if you have not. In addition, you need to finish your application with WSACleanup() . These 2 functions are windows-specific.

Here is a small sample:

int main() {
    WSADATA wsaData;
    int err = WSAStartup(MAKEWORD(2, 2), &wsaData);
    if (err != 0)
        return 1;

    //...
    
    WSACleanup();
}

Here is MSDN page for WSAStartuo() .