MFC-获取本地IP地址并返回cstring

CString CAddStdDlg::GetLocalIP()
{
	WSADATA wsaData;
	int err = WSAStartup(MAKEWORD(2, 0), &wsaData);
	if (err != 0)
	{
		return _T("");
	}

	char szHostName[MAX_PATH] = { 0 };
	int nRetCode;
	nRetCode = gethostname(szHostName, sizeof(szHostName));

	char* lpLocalIP;
	PHOSTENT hostinfo;

	if (nRetCode != 0)
	{
		WSACleanup();
		return _T("");
	}

	hostinfo = gethostbyname(szHostName);
	lpLocalIP = inet_ntoa(*(struct in_addr*) * hostinfo->h_addr_list);

	CString aa(lpLocalIP);

	WSACleanup();

	return aa;
}

void CMyDlg::GetHostAddress(CString &strIPAddr)
{
char    HostName[100];
gethostname(HostName, sizeof(HostName));// 获得本机主机名.

hostent* hn;
hn = gethostbyname(HostName);//根据本机主机名得到本机ip

strIPAddr=inet_ntoa(*(struct in_addr *)hn->h_addr_list[0]);//把ip换成字符串形式
}

//摘自 https://blog.csdn.net/imxiangzi/article/details/38264563