linux下网络通信客户端（普通）

#include <stdio.h>#include <stdlib.h>#include <sys/socket.h>#include <sys/types.h>#include <string.h>#include <arpa/inet.h>//定义sockaddr_in#include <unistd.h>#include <signal.h>#define PORT 3333#define MAX_SIZE 1024int main(int argc,char ** argv){if(argc != 2){printf("please input server ip\n");exit(1);}int sockfd;//创建通信节点的：文件描述符struct sockaddr_in server_addr;char buffer[MAX_SIZE];int n_write;if((sockfd = socket(AF_INET,SOCK_STREAM,0)) < 0){perror("socket success!\n");exit(1);}printf("socket success!\n");bzero(&server_addr,0);server_addr.sin_family = AF_INET;server_addr.sin_port = htons(PORT);server_addr.sin_addr.s_addr = inet_addr(argv[1]);//在套接字上启动连接//int connect(int sockfd, const struct sockaddr *addr,socklen_t addrlen);//成功返回0，失败返回-1//包含第一，三次握手if(connect(sockfd,(struct sockaddr *)&server_addr,(socklen_t)sizeof(server_addr)) < 0){perror("connect server error!\n");exit(1);}printf("connect success!\n");while(1){memset(buffer,0,sizeof(buffer));printf("please input send msg:\n");scanf("%s",buffer);n_write = write(sockfd,buffer,(size_t)sizeof(buffer));if(n_write < 0){perror("send to server msg error!\n");exit(1);}}return 0;}