1、简要

从前用的网络编程函数现在又做了一定的改动，报了这么3个错误。

error C4996: ‘inet_ntoa‘: Use inet_ntop() or InetNtop() instead or define _WINSOCK_DEPRECATED_NO_WARNINGS to disable deprecated API warnings
error C4996: ‘gethostbyaddr‘: Use getnameinfo() or GetNameInfoW() instead or define _WINSOCK_DEPRECATED_NO_WARNINGS to disable deprecated API warnings
error C4996: ‘inet_ntoa‘: Use inet_ntop() or InetNtop() instead or define _WINSOCK_DEPRECATED_NO_WARNINGS to disable deprecated API warnings


2、解决方法1

右键属性-属性页选择【C/C++】->【常规】->【SDL检查】 选择为否。

3、代码解决

既然已经明确提示需要换更安全的函数，那就按照要求来就好了。

serverAddr.sin_addr.S_un.S_addr = inet_addr("127.0.0.1");//自己的IP或者127.0.0.1

改为：

//新改进代码
InetPton(AF_INET, _T("127.0.0.1"), &serverAddr.sin_addr.s_addr);

gethostbyaddr()改用getnameinfo()；

inet_ntop()改用getaddrinfo();

修改后的代码：

#include "stdafx.h"
#include
#pragma comment(lib,"ws2_32.lib")
#include
/*
1. 初始化环境 wsastartup
2. 创建套接字 socket
3. 绑定套接字 bind
4. 监听套接字 listen
5. 处理套接字连接 accept
6. 发送接收数据 send/recv
7. 关闭套接字 closesocket
8. 清理环境 wsacleanup
*/
int main()
{
// 1. 初始化环境 wsastartup
WSADATA wsd = { 0 };
int re = WSAStartup(MAKEWORD(2, 2), &wsd);
if (re != 0) { return 0; }
if (LOBYTE(wsd.wVersion) != 2 ||
HIBYTE(wsd.wVersion) != 2)
{
return 0;
}
// 2. 创建套接字 socket
SOCKET listenSock = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
if (listenSock == INVALID_SOCKET)
{
return 0;
}
// 3. 绑定套接字 bind
sockaddr_in serverAddr;
serverAddr.sin_family = AF_INET;
serverAddr.sin_port = htons(0x5566);
//旧代码
//serverAddr.sin_addr.S_un.S_addr = inet_addr("127.0.0.1");//自己的IP或者127.0.0.1
//新改进代码
InetPton(AF_INET, _T("127.0.0.1"), &serverAddr.sin_addr.s_addr);
re = bind(listenSock, (sockaddr *)&serverAddr, sizeof(serverAddr));
// 4. 监听套接字 listen
re = listen(listenSock, SOMAXCONN);
// 5. 处理套接字连接 accept
sockaddr_in clientAddr;
int size = sizeof(clientAddr);
SOCKET sToClientSock = accept(
listenSock, (sockaddr *)&clientAddr, &size);
//测试获取的结果
//更换为新函数查看使用结果
//旧 主机名
hostent * pHost = gethostbyaddr((char *)&serverAddr.sin_addr, 4, AF_INET);
//旧 IP地址
char * p = inet_ntoa(*(struct in_addr *) (*pHost->h_addr_list));

//新代码测试
///////////////////////////////////////////////////////////////////
struct addrinfo *ptr = NULL;
struct addrinfo hints;
struct addrinfo *result = NULL;
struct sockaddr_in *sockaddr_ipv4;
char hostname[NI_MAXHOST]; //主机名称
char servInfo[NI_MAXSERV]; //具体连接成功的端口
getnameinfo((struct sockaddr *) &serverAddr,
sizeof(struct sockaddr),
hostname,
NI_MAXHOST, servInfo, NI_MAXSERV, NI_NUMERICSERV);
ZeroMemory(&hints, sizeof(hints));
hints.ai_family = AF_UNSPEC;
hints.ai_socktype = SOCK_STREAM;
hints.ai_protocol = IPPROTO_TCP;
getaddrinfo(hostname, servInfo, &hints, &result);
for (ptr = result; ptr != NULL; ptr = ptr->ai_next) {

switch (ptr->ai_family) {
case AF_UNSPEC:
printf("Unspecified\n");
break;
case AF_INET:
printf("AF_INET (IPv4)\n");
sockaddr_ipv4 = (struct sockaddr_in *) ptr->ai_addr;
printf("\tIPv4 address %s\n",
inet_ntoa(sockaddr_ipv4->sin_addr));
break;
}

}
///////////////////////////////////////////////////////////////////
// 6.1 发送数据 send
char buf[100] = "hello socket client,from server!";
re = send(sToClientSock, buf, strlen(buf), 0);
if (re == SOCKET_ERROR)
{
goto over;
}
// 6.2 接收数据 recv
re = recv(sToClientSock, buf, sizeof(buf), 0);
if (re == INVALID_SOCKET)
{
goto over;
}
over:
// 7. 关闭套接字 closesocket
closesocket(listenSock);
closesocket(sToClientSock);
// 8. 清理环境 wsacleanup
WSACleanup();
return 0;
}