TCP
server端：
#include <stdio.h>#include <stdlib.h>#include <unistd.h>#include <string.h>#include <arpa/inet.h>#define SERVER_PORT 8888#define SERVER_IP "192.168.1.100"int main( {
// 1. 创建监听套接字
int fd = socket(AF_INET, SOCK_STREAM, 0;if (fd == -1 { perror("fail fo socket!";return -1; } printf("create socket fd[%d] success!\n";
// 2. 绑定监听套接字到本地IP和port
struct sockaddr_in addr; addr.sin_family = AF_INET; addr.sin_port = htons(SERVER_PORT; inet_pton(AF_INET, SERVER_IP, &addr.sin_addr;int ret = bind(fd, (struct sockaddr*&addr, sizeof(addr;if (ret == -1 { perror("fail to bind!";return -2; } printf("bind success!\n";
// 3. 设置监听ret = listen(fd, 128;if (ret == -1 { perror("fail to listen!";return -3; } printf("listen success!\n";
// 4. 阻塞等待，等待连接到达，连接成功后返回通信用的套接字
struct sockaddr_in c_addr;int c_addr_len = 0;int c_fd = accept(fd, (struct sockaddr*&c_addr, &c_addr_len;if (c_fd == -1 { perror("fail to accept!";return -4; } printf("accept success!\n";
// 5. 开始通信
char buff[1024];char ip[32]; memset(buff, 0, sizeof(buff; memset(ip, 0, sizeof(ip;int len = read(c_fd, buff, sizeof(buff;if (len > 0 { printf("client %s:%d >> %s\n", inet_ntop(AF_INET, &c_addr.sin_addr, ip , sizeof(ip, ntohs(c_addr.sin_port, buff; write(c_fd, buff, len; }else if (len == 0 { printf("connect close!";}else{ printf("connect fail!"; }
// 6. 关闭套接字
close(fd; close(c_fd;return 0; }
client端：
#include <stdio.h>#include <stdlib.h>#include <unistd.h>#include <string.h>#include <arpa/inet.h>#define SERVER_PORT 8888#define SERVER_IP "192.168.1.100"int main( {
// 1. 创建通信套接字
int fd = socket(AF_INET, SOCK_STREAM, 0;if (fd == -1 { perror("fail fo socket!";return -1; } printf("create socket success!\n";
// 2. 连接服务器
struct sockaddr_in addr; addr.sin_family = AF_INET; addr.sin_port = htons(SERVER_PORT; inet_pton(AF_INET, SERVER_IP, &addr.sin_addr;int ret = connect(fd, (struct sockaddr*&addr, sizeof(addr;if (fd == -1 { perror("fail to connect!";return -2; } printf("connect success!\n";
// 3. 通信
char buff[1024];char ip[32]; sprintf(buff, "Hello, this is a test connection with the server!";int len = send(fd, buff, strlen(buff + 1, 0; memset(buff, 0, sizeof(buff; memset(ip, 0, sizeof(ip; len = recv(fd, buff, sizeof(buff, 0;if (len > 0 { printf("server %s:%d >> %s\n", inet_ntop(AF_INET, &addr.sin_addr, ip , sizeof(ip, ntohs(addr.sin_port, buff; }else if (len == 0 { printf("connect close!\n"; }else{ perror("recv fail!\n"; }
// 4. 关闭套接字
close(fd;return 0; }