Linux 树莓派上简单的网络编程程序实现

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客户端程序，向服务器发送helloworld消息

#include<stdio.h>#include <stdio.h> #include <string.h>#include <unistd.h>#include <sys/types.h>  #include <sys/socket.h>  #include <netinet/in.h>  #include <arpa/inet.h> #include <stdlib.h>#include <stdint.h>int main(){    int client_sockfd = -1;                           //创建套接字struct sockaddr_in server_addr;  //服务器端网络地址结构体  memset(&server_addr,0,sizeof(server_addr));  //数据初始化--清零  server_addr.sin_family = AF_INET; server_addr.sin_addr.s_addr = inet_addr("127.0.0.1");   //服务器IP地址 server_addr.sin_port = htons(8000);if(-1 == (client_sockfd = socket(AF_INET,SOCK_STREAM,0)))  {    return -1;  }  if(-1 == (connect(client_sockfd,(struct sockaddr *)&server_addr,sizeof(struct sockaddr)))){return -1;}send(client_sockfd,"helloworld",sizeof("helloworld"),0);close(client_sockfd);//关闭套接字}

服务端接收程序

#include <stdio.h>#include <sys/socket.h>#include <sys/types.h>#include <string.h>#include <netinet/in.h>#include <stdlib.h>#include <errno.h>#include <unistd.h>#include <arpa/inet.h>#define BUFFERSIZE 1024int main(int argc,char **argv){int listenfd,connfd;struct sockaddr_in sockaddr;char buff[BUFFERSIZE];int n;memset(&sockaddr,0,sizeof(sockaddr));sockaddr.sin_family = AF_INET;sockaddr.sin_addr.s_addr = htonl(INADDR_ANY);   //绑定本机网卡sockaddr.sin_port = htons(8000);listenfd = socket(AF_INET,SOCK_STREAM,0);if(-1 == bind(listenfd,(struct sockaddr *) &sockaddr,sizeof(sockaddr))){printf("bind error");}listen(listenfd,1024);while(1){ if((connfd = accept(listenfd,(struct sockaddr*)NULL,NULL))==-1) { printf("accpet socket error: %s errno :%d\n",strerror(errno),errno); continue; }  n = recv(connfd,buff,BUFFERSIZE,0); buff[n] = '\0'; printf("recv msg from client:%s\n",buff); close(connfd);} close(listenfd);}

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