#include <stdio.h>
#include <winsock2.h> // winsock接口
#pragma comment(lib, "ws2_32.lib") // winsock实现int main()
{WORD wVersionRequested;  // 双字节，winsock库的版本WSADATA wsaData;         // winsock库版本的相关信息
    wVersionRequested = MAKEWORD(1, 1); // 0x0101 即:257// 加载winsock库并确定winsock版本，系统会把数据填入wsaData中WSAStartup( wVersionRequested, &wsaData );// AF_INET 表示采用TCP/IP协议族// SOCK_STREAM 表示采用TCP协议// 0是通常的默认情况unsigned int sockSrv = socket(AF_INET, SOCK_STREAM, 0);SOCKADDR_IN addrSrv;addrSrv.sin_family = AF_INET; // TCP/IP协议族addrSrv.sin_addr.S_un.S_addr = INADDR_ANY; //inet_addr("0.0.0.0"); addrSrv.sin_port = htons(8888); // socket对应的端口// 将socket绑定到某个IP和端口（IP标识主机，端口标识通信进程）bind(sockSrv,(SOCKADDR*)&addrSrv, sizeof(SOCKADDR));// 将socket设置为监听模式，5表示等待连接队列的最大长度listen(sockSrv, 5);SOCKADDR_IN addrClient;int len = sizeof(SOCKADDR);while(1){// sockSrv为监听状态下的socket// &addrClient是缓冲区地址，保存了客户端的IP和端口等信息// len是包含地址信息的长度// 如果客户端没有启动，那么程序一直停留在该函数处unsigned int sockConn = accept(sockSrv,(SOCKADDR*)&addrClient, &len);char sendBuf[100] = {0};sprintf(sendBuf,"%s", inet_ntoa(addrClient.sin_addr)); // 将客户端的IP地址保存下来send(sockConn, sendBuf, strlen(sendBuf) + 1, 0); // 发送数据到客户端，最后一个参数一般设置为0char recvBuf[100] = {0};recv(sockConn, recvBuf, 100, 0); // 接收客户端数据，最后一个参数一般设置为0printf("%s\n", recvBuf);closesocket(sockConn);}closesocket(sockSrv);WSACleanup();return 0;
}

#include <winsock2.h>
#include <stdio.h>
#pragma comment(lib, "ws2_32.lib")int main()
{WORD wVersionRequested;WSADATA wsaData;wVersionRequested = MAKEWORD(1, 1);WSAStartup( wVersionRequested, &wsaData );SOCKET sockClient = socket(AF_INET, SOCK_STREAM, 0);SOCKADDR_IN addrSrv;addrSrv.sin_addr.S_un.S_addr = inet_addr("192.168.1.102");addrSrv.sin_family = AF_INET;addrSrv.sin_port = htons(8888);int ret = connect(sockClient, (SOCKADDR*)&addrSrv, sizeof(SOCKADDR));char recvBuf[100] = {0};recv(sockClient, recvBuf, 100, 0);printf("%s\n", recvBuf);send(sockClient, "hello world", strlen("hello world") + 1, 0);closesocket(sockClient);WSACleanup();return 0;
}

#include <winsock2.h>
#include <stdio.h>
#pragma comment(lib, "ws2_32.lib")int main()
{WORD wVersionRequested;WSADATA wsaData;wVersionRequested = MAKEWORD(1, 1);WSAStartup( wVersionRequested, &wsaData );SOCKET sockClient = socket(AF_INET, SOCK_STREAM, 0);SOCKADDR_IN addrSrv;addrSrv.sin_addr.S_un.S_addr = inet_addr("127.0.0.1");addrSrv.sin_family = AF_INET;addrSrv.sin_port = htons(8888);int ret = connect(sockClient, (SOCKADDR*)&addrSrv, sizeof(SOCKADDR));char recvBuf[100] = {0};recv(sockClient, recvBuf, 100, 0);printf("%s\n", recvBuf);send(sockClient, "hello world", strlen("hello world") + 1, 0);closesocket(sockClient);WSACleanup();return 0;
}