MAC OS X socket 2 ［a simple example］

Xcode->New Workspace

XCode->New Project: C: [Add to : ?]

Server:

code

//
//  main.c
//  s2
//  Server
//  Created by DMD on 4/7/14.
#include <stdio.h>

#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <unistd.h>
#include <string.h>
#include <stdlib.h>
#include <fcntl.h>
#include <sys/shm.h>

#define MYPORT  12345
#define QUEUE   20
#define BUFFER_SIZE 1024

//Sever
int main(int argc, const char * argv[])
{
    printf("\nServer:\n");
    ///定义sockfd
    int server_sockfd = socket(AF_INET,SOCK_STREAM, 0);
    if(-1 == server_sockfd)
    {
        printf("initialize socket fail ! \r\n");
        return -1;
    }
    printf("initialize socket ok !\r\n");

    ///定义sockaddr_in
    struct sockaddr_in server_sockaddr;
    server_sockaddr.sin_family = AF_INET;
    server_sockaddr.sin_port = htons(MYPORT);
    server_sockaddr.sin_addr.s_addr = htonl(INADDR_ANY);

    ///bind，成功返回0，出错返回-1
    if(bind(server_sockfd,(struct sockaddr *)&server_sockaddr,sizeof(server_sockaddr))==-1)
    {
        perror("bind");
        exit(1);
    }
    printf("bind ok !\r\n");  

    ///listen，成功返回0，出错返回-1
    if(listen(server_sockfd,QUEUE) == -1)
    {
        perror("listen");
        exit(1);
    }
    printf("Starting listen......\r\n");
    printf("(Please run Client and input something)\r\n"); 

    ///客户端套接字
    char buffer[BUFFER_SIZE];
    char send_client_buffer[BUFFER_SIZE];
    struct sockaddr_in client_addr;
    socklen_t length = sizeof(client_addr);

    ///成功返回非负描述字，出错返回-1
    int conn = accept(server_sockfd, (struct sockaddr*)&client_addr, &length);
    if(conn<0)
    {
        perror("accept connect failed");
        exit(1);
    }
    printf("start accept data from Client...\r\n");    

    while(1)
    {
        memset(buffer,0,sizeof(buffer));
        memset(send_client_buffer,0,sizeof(send_client_buffer));
        //开始接受来自服务器信息
        int len = recv(conn, buffer, sizeof(buffer),0);
        //printf("Client Said,\"%s\"\n",buffer);
        printf("client said:%s",buffer);
        //如果输入"exit",表示让服务器跳出while,即不再接受来自客户端的数据，并且关闭服务器
        if(strcmp(buffer,"exit\n")==0)
        {
            break;
        }
        else if(strcmp(buffer,"100\n")==0)
        {
          sprintf(send_client_buffer,"hello, this is one handred :%s",buffer);
        }
        else if(strcmp(buffer,"30\n")==0)
        {
          sprintf(send_client_buffer,"hello, this is thirty :%s",buffer);
        }
        else
        {
          sprintf(send_client_buffer,"Server repeat you said that is :%s",buffer);
        //将信息输出到屏幕上
        //fputs(send_client_buffer, stdout);
        }
        //将字符串buffer发送给客户端conn里。
        send(conn, send_client_buffer, strlen(send_client_buffer), 0);
        memset(buffer,0,sizeof(buffer));
        memset(send_client_buffer,0,sizeof(send_client_buffer));

    }

    // 关闭连接
    close(conn);
    close(server_sockfd);
    return 0;
}

// end

XCode->New Project: C:

Client:

code

//
//  main.c
//  c2
//  Client
//  Created by DMD on 4/7/14.

#include <sys/types.h>
#include <sys/socket.h>
#include <stdio.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <unistd.h>
#include <string.h>
#include <stdlib.h>
#include <fcntl.h>
#include <sys/shm.h>

#define MYPORT  12345
#define BUFFER_SIZE 1024

//在main函数里面加入参数,会让第一次输入的时候得到一个未知字符。
//int main(int argc, const char * argv[])
int main()
{
    printf("\nClient:\n");

    ///定义sockfd
    int sock_cli = socket(AF_INET,SOCK_STREAM, 0);
    if(-1 == sock_cli)
    {
        printf("initialize socket fail ! \r\n");
        return -1;
    }
    //printf("initialize socket ok !\r\n");
    ///定义sockaddr_in
    struct sockaddr_in servaddr;
    memset(&servaddr, 0, sizeof(servaddr));
    servaddr.sin_family = AF_INET;
    servaddr.sin_port = htons(MYPORT);  ///服务器端口
    servaddr.sin_addr.s_addr = inet_addr("127.0.0.1");  ///服务器ip

    ///连接服务器，成功返回0，错误返回-1
    if (connect(sock_cli, (struct sockaddr *)&servaddr, sizeof(servaddr)) < 0)
    {
        perror("connect");
        exit(1);
    }
    printf("Success connect Server IP:%d ,port :%d !\r\n",servaddr.sin_addr.s_addr,servaddr.sin_port);
    printf("Please type something to Server: \r\n");

    char sendbuf[BUFFER_SIZE];
    char recvbuf[BUFFER_SIZE];
    memset(sendbuf,0,sizeof(sendbuf));
    memset(recvbuf, 0, sizeof(recvbuf));

    //客户端：输入字符串到sendbuf,用回车结束
   while (fgets(sendbuf, sizeof(sendbuf), stdin) != NULL)
   {
        //将数据发送到服务器端
        send(sock_cli, sendbuf, strlen(sendbuf),0); ///发送
        //如果输入的是exit，就退出
        if(strcmp(sendbuf,"exit\n")==0)
        {
            break;
        }

        //接受来自服务器的反馈信息
        recv(sock_cli, recvbuf, sizeof(recvbuf),0); ///接收
        //将信息输出到屏幕上
        //fputs(recvbuf, stdout);
        printf("%s",recvbuf);

        memset(sendbuf, 0, sizeof(sendbuf));
        memset(recvbuf, 0, sizeof(recvbuf));
  }
    close(sock_cli);
    return 0;
}

Test:

STEP1.Run Server

STEP2.Run Client

in client type:

100 enter

30 enter

hello

Success!

原理图：服务器和客户端通信

END

2014-7-3 by DMD

MAC OS X socket 2 ［a simple example］,布布扣,bubuko.com