本代码可直接使用 根据TCP/IP三次握手，实验时可使用两台电脑，或者打开两个终端模拟通信。

服务器端：

#include <stdio.h>  
#include <iostream>
#include <winsock2.h>  #include <WS2tcpip.h>
#pragma comment(lib,"ws2_32.lib")  int main(int argc, char* argv[])  
{  //初始化WSA  WORD sockVersion = MAKEWORD(2,2);  WSADATA wsaData;  if(WSAStartup(sockVersion, &wsaData)!=0)  {  return 0;  }  //创建套接字  SOCKET slisten = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);  if(slisten == INVALID_SOCKET)  {  printf("socket error !");  return 0;  }  //绑定IP和端口  sockaddr_in sin;  sin.sin_family = AF_INET;  sin.sin_port = htons(8888);  sin.sin_addr.S_un.S_addr = INADDR_ANY;   if(bind(slisten, (LPSOCKADDR)&sin, sizeof(sin)) == SOCKET_ERROR)  {  printf("bind error !");  }  //开始监听  if(listen(slisten, 5) == SOCKET_ERROR)  {  printf("listen error !");  return 0;  }  //循环接收数据  SOCKET sClient;  sockaddr_in remoteAddr;  int nAddrlen = sizeof(remoteAddr);  char revData[255];   while (true)  {  printf("等待连接...\n");  sClient = accept(slisten, (SOCKADDR *)&remoteAddr, &nAddrlen);  if(sClient == INVALID_SOCKET)  {  printf("accept error !");  continue;  }  printf("接受到一个连接：%s \r\n", inet_ntop(AF_INET, (void*)&remoteAddr.sin_addr, revData, 16));// printf("接受到一个连接：%s \r\n", inet_ntoa(remoteAddr.sin_addr));  //inet_ntoa老函数在新版本VS+64位计算机上使用会报错//接收数据  int ret = recv(sClient, revData, 255, 0);         if(ret > 0)  {  revData[ret] = 0x00;  printf(revData);  }  //发送数据  const char * sendData = "你好，TCP客户端！\n";  send(sClient, sendData, strlen(sendData), 0);  closesocket(sClient);  }  closesocket(slisten);  WSACleanup();  return 0;  
} 

用户端：

#include<WINSOCK2.H>
#include<STDIO.H>
#include<iostream>
#include<cstring>
#include <WS2tcpip.h>
using namespace std;
#pragma comment(lib, "ws2_32.lib")
#pragma warning(disable:4996) //如果你有inet_addr函数的报错，加上这个就解决了
int main()
{WORD sockVersion = MAKEWORD(2, 2);WSADATA data;if(WSAStartup(sockVersion, &data)!=0){return 0;}while(true){SOCKET sclient = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);if(sclient == INVALID_SOCKET){printf("invalid socket!");return 0;}sockaddr_in serAddr;serAddr.sin_family = AF_INET;serAddr.sin_port = htons(8888);//serAddr.sin_addr.S_un.S_addr = inet_pton(AF_INET, "127.0.0.1", &serAddr);serAddr.sin_addr.S_un.S_addr = inet_addr("127.0.0.1");//如果你有inet_addr函数的报错，看上文if(connect(sclient, (sockaddr *)&serAddr, sizeof(serAddr)) == SOCKET_ERROR){  //连接失败 printf("connect error !");closesocket(sclient);return 0;}string data;cin>>data;const char * sendData;sendData = data.c_str();   //string转const char* //char * sendData = "你好，TCP服务端，我是客户端\n";send(sclient, sendData, strlen(sendData), 0);//send()用来将数据由指定的socket传给对方主机//int send(int s, const void * msg, int len, unsigned int flags)//s为已建立好连接的socket，msg指向数据内容，len则为数据长度，参数flags一般设0//成功则返回实际传送出去的字符数，失败返回-1，错误原因存于error char recData[255];int ret = recv(sclient, recData, 255, 0);if(ret>0){recData[ret] = 0x00;printf(recData);} closesocket(sclient);}WSACleanup();return 0;}

工具->编译选项->在连接器命令行加入如下命令里面添加-lwsock32 即可

两个程序的原理本质是一样的网上有很多类似的原理介绍，这里不再赘述，只需要按照这个原理图，一步步实现代码即可。

此外遇到的一些新版本VS编译的问题，在代码注释中已经给出答案了，完美运行哦~