socket通信之 udp协议2

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服务端

步骤：1. 创建套接字2. 绑定ip3. 读取数据#include <stdio.h>#include <sys/types.h>          /* See NOTES */#include <sys/socket.h>#include <unistd.h>#include <stdlib.h>#include <linux/in.h>#define SRV_PORT 9999int main(int argc, char *argv[]){    // create a socket    int srv_fd;    int ret;    char buf[128];    srv_fd = socket(AF_INET, SOCK_DGRAM, 0);   //创建套接字    if(srv_fd < 0)    {    perror("socket");    exit(1);    }    // bind addr    struct sockaddr_in  self;                 //描述本地ip和端口的信息    self.sin_family = AF_INET;    self.sin_port = htons(SRV_PORT);    //self.sin_addr.s_addr = inet_addr("192.168.7.5"); //本机器的ip    self.sin_addr.s_addr = htonl(INADDR_ANY); //本机器的所有ip    ret = bind(srv_fd, (const struct sockaddr *)&self, sizeof(self));  //绑定ip    if(ret < 0)    {    perror("bind");    exit(1);    }    struct sockaddr_in info;    socklen_t len = sizeof(info);    while(1)    {    //直接读取数据    ret = recvfrom(srv_fd, buf, 128, 0, (struct sockaddr *)&info, &len);   //读取信息    if(ret < 0)    {        perror("read");        exit(1);    }    buf[ret] = '\0';    printf("from client %s (port %d) : %s\n", inet_ntoa(info.sin_addr), ntohs(info.sin_port), buf);  }    close(srv_fd);    return 0;}

客户端

步骤：1. 创建套接字2. 发送信息#include <stdio.h>#include <string.h>#include <sys/types.h>          /* See NOTES */#include <sys/socket.h>#include <unistd.h>#include <stdlib.h>#include <linux/in.h>#define SRV_PORT 9999#define SRV_IP  "192.168.7.5"int main(int argc, char *argv[]){    // create socket    int ret;    int count = 5;    //char *content = "hello server, come on baby";    char wbuf[128];    if(argc < 2)    {    printf("usage :  ./client  serverip\n");      exit(1);    }    int fd = socket(AF_INET, SOCK_DGRAM, 0);    //创建套接字    if(fd < 0)    {    perror("socket");    exit(1);    }    struct sockaddr_in peer;    peer.sin_family = AF_INET;    peer.sin_port = htons(SRV_PORT);    //inet_aton(SRV_IP, &peer.sin_addr);        inet_aton(argv[1], &peer.sin_addr);        while(1)    {    printf("dear, pls input your words : \n");    fgets(wbuf, 128, stdin);    ret = sendto(fd, wbuf, 128, 0, (struct sockaddr *)&peer, sizeof(peer));    //发送信息    if(ret < 0)    {        perror("sendto");        exit(1);    }    }     close(fd);    return 0;}

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