求 Socket 异常分析

//创建套接字
        SOCKET sServer;
        sServer= socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);    
        if(INVALID_SOCKET == sServer)
        {
            MessageBox("套接字创建失败！");    
    
        }
        

        DWORD dwIP;   // 获取IP地址
        ((CIPAddressCtrl*)GetDlgItem(IDC_IPADDRESS))->GetAddress(dwIP);

        SOCKADDR_IN addrServ;
        addrServ.sin_family=AF_INET;
        addrServ.sin_port=htons(m_port);
        addrServ.sin_addr.S_un.S_addr=htonl(dwIP);

            //绑定套接字
        int        retVal;    
        retVal = bind(sServer, (SOCKADDR*)&addrServ, sizeof(SOCKADDR_IN));
        if(SOCKET_ERROR == retVal)
        {
            closesocket(sServer);                    //关闭套接字
    //        MessageBox("绑定套接字失败！");    
            CString sMSG;
            sMSG.Format("绑定套接字失败：%d",WSAGetLastError());
            AfxMessageBox(sMSG);
    
        }    */