socket简单应用客户端代码

client.c

#include <stdio.h>

#include <stdlib.h>

#include <errno.h>

#include <string.h>

#include <netdb.h>

#include <sys/types.h>

#include <netinet/in.h>

#include <sys/un.h>

#include <sys/socket.h>

#include <sys/unistd.h>

#define PORT 8999

#define DESIP "127.0.0.1"

#define MAXSIZE (8 * 4096)

int main(int argc, char *argv[])

{

int sockfd;

struct sockaddr_in des_addr;

char sendmsg[MAXSIZE], recvmsg[MAXSIZE];

sockfd = socket(AF_INET, SOCK_STREAM, 0);//创建socket

if (sockfd < 0) {

perror("socket error");

return -1;

}

/* 设置连接目的地址 */

des_addr.sin_family = AF_INET;

des_addr.sin_port = htons(PORT);

des_addr.sin_addr.s_addr = inet_addr(DESIP);

bzero(&(des_addr.sin_zero), 8);

/* 发送连接请求 */

if (connect(sockfd, (struct sockaddr *)&des_addr, sizeof(struct sockaddr)) < 0) {

perror("connect failed");

return -1;

}

printf("enter the msg you want to send, enter \"quit\" to quit!\n");

while (1) {

memset(sendmsg, 0, MAXSIZE);

memset(recvmsg, 0, MAXSIZE);

printf("client:\n");

gets(sendmsg);

if (send(sockfd, sendmsg, strlen(sendmsg) + 1, 0) < 0) {//发送信息

printf("send msg failed!");

close(sockfd);

return -1;

}

if (!strcmp(sendmsg, "quit")) {

printf("quit success!\n");

break;

}

memset(recvmsg, 0, MAXSIZE);

if (recv(sockfd, recvmsg, MAXSIZE, 0) < 0) {//接收信息

printf("\nserver has no reply!\n");

close(sockfd);

}

printf("server:\n%s\n", recvmsg);

}

close(sockfd); //关闭套接字

return 0;

}