socker编程实现一个server收到client的信息

1. 列表内容

IDE: Clion 2017.01
OS：Ubuntu 16.04 xenial
Main reference: http://blog.chinaunix.net/uid-27007072-id-3390521.html
先打开server.cpp, 连接client收到对方的消息，点到点连接，一对一。

server.cpp 共7步，开头结尾为建立与关闭socket

***#include <iostream>#include <stdio.h> #include <stdlib.h> #include <string.h> #include <errno.h> #include <sys/socket.h> #include <arpa/inet.h> #include <netinet/in.h> #include <sys/types.h> #include <unistd.h> #include <sys/time.h> using namespace std;#define BUFLEN 1024  //缓冲区长度#define PORT 6666#define LISTNUM 20 //等待连接队列的最大长度int main() {     int sockfd, newfd;     struct sockaddr_in s_addr, c_addr;     char buf[BUFLEN];     socklen_t len;     unsigned int port, listnum;     fd_set rfds;  //Local variable is never used    struct timeval tv;     int retval,maxfd;  //Local variable is never used    /*1.建立socket*/     if((sockfd = socket(PF_INET, SOCK_STREAM, 0)) == -1){                 //PF 表示PROTOCL FAMILY 协议族                // SOCK_STREAM 表示采用TCP协议                // 0是通常的默认情况        perror("socket");         exit(errno);     }else         printf("socket create success!\n");         /*2.准备通信地址*/    memset(&s_addr,0,sizeof(s_addr));     s_addr.sin_family = AF_INET;  //sin_family协议族，AF_INET采用TCP/IP协议    s_addr.sin_port = htons(PORT);  // socket对应的端口    s_addr.sin_addr.s_addr = htons(INADDR_ANY);  //INADDR_ANY对本机所有IP有效，INADDR_ANY相当                                                       于inet_addr("0.0.0.0");***    //1.2两步与client相同          /*3.绑定socket与通信地址 */    if((bind(sockfd, (struct sockaddr*) &s_addr,sizeof(struct sockaddr))) == -1){        perror("bind");        exit(errno);    }else        printf("bind success!\n"); //绑定成功    /*4.监听（等待连接）*/    if(listen(sockfd,listnum) == -1){        perror("listen");        exit(errno);    }else        printf("the server is listening!\n");    socklen_t _size = sizeof(struct sockaddr);    /*5.accept函数（连接）*/    newfd = accept(sockfd,(sockaddr*)&c_addr,&_size);    /*6.连接成功，把accept返回的socket描述符当做文件描述符进行操作，可以用四个函数，write,read,send,recv,*/    if(newfd < 0){        cout<<"accept failed."<<endl;    }    while(1){        cout<<"recv"<<endl;        len = recv(newfd,buf,BUFLEN,0);        buf[len] = '\0';        cout<<buf<<endl;    }    /*7.关闭socket描述符*/    close(sockfd);    return 0;}

client.cpp 共五步,开头结尾为建立与关闭socket

***#include <iostream>#include <stdio.h> #include <stdlib.h> #include <string.h> #include <errno.h> #include <sys/socket.h> #include <arpa/inet.h> #include <netinet/in.h> #include <sys/types.h> #include <unistd.h> #include <sys/time.h> using namespace std;#define BUFLEN 1024  //缓冲区长度#define PORT 6666#define LISTNUM 20 //等待连接队列的最大长度int main() {     int sockfd, newfd;     struct sockaddr_in s_addr, c_addr;     char buf[BUFLEN];     socklen_t len;     unsigned int port, listnum;     fd_set rfds;  //Local variable is never used    struct timeval tv;     int retval,maxfd;  //Local variable is never used    /*1.建立socket*/     if((sockfd = socket(PF_INET, SOCK_STREAM, 0)) == -1){                 //PF 表示PROTOCL FAMILY 协议族                // SOCK_STREAM 表示采用TCP协议                // 0是通常的默认情况        perror("socket");         exit(errno);     }else         printf("socket create success!\n");         /*2.准备通信地址*/    memset(&s_addr,0,sizeof(s_addr));     s_addr.sin_family = AF_INET;  //sin_family协议族，AF_INET采用TCP/IP协议    s_addr.sin_port = htons(PORT);  // socket对应的端口    s_addr.sin_addr.s_addr = htons(INADDR_ANY);  //INADDR_ANY对本机所有IP有效，INADDR_ANY相当                                                       于inet_addr("0.0.0.0");***//上面1.2与server相同    /*3.建立连接connect*/    if(connect(sockfd,(struct sockaddr*)&s_addr,sizeof(struct sockaddr)) == -1){          perror("connect");        exit(errno);    }else        printf("conncet success!\n");/*4.类似于server中的第六步，连接成功，把accept返回的socket描述符当做文件描述符进行操作*/    while(1){        int ret = send(sockfd,"hello",strlen("hello"),0);        if(ret < 0){            cout<<"send failed."<<endl;        } else            cout<<"send successful! "<<endl;        sleep(1); //暂停1秒    }    /*4.关闭连接*/    close(sockfd); //关闭socket    return 0;}