C语言|C语言-socket（客户端-服务端通信） dev|socket通信

C语言基于socket-实现客户端-服务端通信 【C语言|C语言-socket（客户端-服务端通信）】关于socket不多赘述，博主上一篇做过简单介绍，详情请自行百度查询，本次主要做的是基于socket通信的C语言实现

需要使用的头文件：
winsock2.h
操作平台Windows，使用编译器dev(报错缺的文件看文章末尾的补充）
winsock2中数据结构及调用简单说明：
socket的创建使用SOCKET，
socket的的地址空间创建采用socketaddr_in
bind()服务端用来绑定端口
listen()侦听模式
accept()接受服务
send()发送数据
recv()接收数据
connect()客户端连接服务器
socketaddr_in的数据结构如下：

/*struct sockaddr { //地址族，2字节 unsigned short sa_family; //存放地址和端口，14字节 char S_un.S_addr[14]; } struct sockaddr_in { //地址族 short int sin_family; //端口号(使用网络字节序) unsigned short int sin_port; //地址 struct in_addr sin_addr; } */

该数据winsock2，已经定义好无需二次定义，博主给出仅供参考方便编程理解。

服务端代码实现

#include #include #include #pragma comment(lib,"ws2_32.lib")int main(int argc, char* argv[]) { //初始化 WSADATA wsa_data; if(WSAStartup(0x202, &wsa_data)!=0) { return 0; }//创建套接字 SOCKET server_listen = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP); if(server_listen == INVALID_SOCKET) { printf("socket error !"); return 0; }//绑定IP和端口 sockaddr_in server_socket; server_socket.sin_family = AF_INET; server_socket.sin_port = htons(8888); server_socket.sin_addr.S_un.S_addr = INADDR_ANY; if(bind(server_listen, (LPSOCKADDR)&server_socket, sizeof(server_socket)) == SOCKET_ERROR) { printf("bind error !"); }//开始监听 if(listen(server_listen, 5) == SOCKET_ERROR) { printf("listen error !"); }//创建客户端套接字 SOCKET client_socket; sockaddr_in client_addr; int client_addr_len = sizeof(client_addr); char rev_data[255]; //循环接收数据 while (true) { printf("\nWait connect...\n"); client_socket = accept(server_listen, (SOCKADDR *)&client_addr, &client_addr_len); if(client_socket == INVALID_SOCKET) { printf("accept error !"); continue; } printf("\nClient IP: %s\n", inet_ntoa(client_addr.sin_addr)); //接收数据 int ret = recv(client_socket, rev_data, 255, 0); if(ret) { rev_data[ret] = '\0'; printf(rev_data); }//回送数据 const char * send_data = "https://www.it610.com/article/Hello! TCP_CLIENT！/n"; send(client_socket, send_data, strlen(send_data), 0); //关闭套接字 closesocket(client_socket); } //关闭侦听套接字 closesocket(server_listen); //关闭初始化服务 WSACleanup(); return 0; }

4.客户端代码实现

#include #include #include #pragma comment(lib,"ws2_32.lib")int main(int argc, char* argv[]) { //初始化 WSADATA wsa_data; if(WSAStartup(0x202, &wsa_data)!=0) { return 0; }//创建套接字 SOCKET client_socket = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP); if(client_socket == INVALID_SOCKET) { printf("socket error !"); return 0; }//绑定IP和端口 sockaddr_in server_socket; server_socket.sin_family = AF_INET; server_socket.sin_port = htons(8888); server_socket.sin_addr.S_un.S_addr = inet_addr("127.0.0.1"); if(connect(client_socket, (LPSOCKADDR)&server_socket, sizeof(server_socket)) == SOCKET_ERROR) { printf("conect error !"); return 1; } printf("connect suceessfully\n"); char send_buff[255]; char rec_buff[255]; while(true) { printf("input message:"); scanf("%s",send_buff); send(client_socket,send_buff,sizeof(send_buff),0); if (strcmp(send_buff,"exit")==0) break; rec_buff[0] = '\0'; int data_len = recv(client_socket,rec_buff,255,0); rec_buff[data_len]='\0'; printf("\n%s\n",rec_buff); } closesocket(client_socket); WSACleanup(); return 0; }

补充
dev直接运行会报错
需要手动添加配置文件：
“工具”–>“编译选项”–>“编译器”–>添加“-lwsock32”–>勾选，保存
标题
效果演示