通过windows API获取本机IP

    //获取本机ip
    CString getIP()
    {
        SOCKET sd = WSASocket(AF_INET, SOCK_DGRAM, 0, 0, 0, 0);
        CString strIP;
        
        if (sd == SOCKET_ERROR)
        {
            closesocket(sd);
            return _T("");
        }     
        else
        {
            INTERFACE_INFO InterfaceList[20];
            unsigned long nBytesReturned;

            if (WSAIoctl(sd, SIO_GET_INTERFACE_LIST, 0, 0, &InterfaceList, sizeof(InterfaceList), &nBytesReturned, 0, 0) == SOCKET_ERROR)
            {
                closesocket(sd);
                return _T("");
            }
            else
            {
                int nNumInterfaces = nBytesReturned / sizeof(INTERFACE_INFO);

                for (int i = 0; i < nNumInterfaces; i++)
                {
                    sockaddr_in* pAddress;
                    pAddress = (sockaddr_in*)&(InterfaceList[i].iiAddress);
                    strIP = inet_ntoa(pAddress->sin_addr);
                    if (strIP == _T("127.0.0.1"))
                    {
                        continue;
                    }
                    else
                    {
                            closesocket(sd);
                            return strIP;
                    }
                }
                closesocket(sd);
                return _T("");
            }
        }
    }

记得包含头文件

#include <WinSock2.h>
#include <WS2tcpip.h>

参考自 https://bbs.csdn.net/topics/360237856