linux下简单的C++ socket编程

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最近时间比较多，把以前了解过得都实际试一试总结一下。。虽然工作中暂时用不到网络编程。

服务端：

/*Refernce:http://www.linuxidc.com/Linux/2011-06/37951.htmhttp://www.oschina.net/code/snippet_153782_16563

*/#include <iostream>#include <stdlib.h>#include <netinet/in.h>#include <unistd.h>#include <sys/socket.h>#include <arpa/inet.h>#include <string.h>using namespace std;

int main(){    struct sockaddr_in s_in;//server address structure    struct sockaddr_in c_in;//client address structure    int l_fd,c_fd;    socklen_t len;    char buf[1024];//content buff area    char addr_p[16];    int port = 8009;    memset((void *)&s_in,0,sizeof(s_in));        //bzero((void *)&s_in,sizeof(s_in));    s_in.sin_family = AF_INET;//IPV4 communication domain    s_in.sin_addr.s_addr = INADDR_ANY;//accept any address    s_in.sin_port = htons(port);//change port to netchar    l_fd = socket(AF_INET,SOCK_STREAM,0);//socket(int domain, int type, int protocol)    /*bind(int sockfd,struct sockaddr *my_addr, int addrlen);　　  sockfd是调用socket函数返回的socket描述符,my_addr是一个指向包含有本机IP地址    及端口号等信息的sockaddr类型的指针；addrlen常被设置为sizeof(struct sockaddr)    */    bind(l_fd,(struct sockaddr *)&s_in,sizeof(s_in));    listen(l_fd,10);//lisiening start    cout<<"begin"<<endl;    while(1){    /*    accept()函数让服务器接收客户的连接请求.    accept(int sockfd, void *addr, int *addrlen);　　  sockfd是被监听的socket描述符，addr通常是一个指向sockaddr_in变量的指针，该变量用    来存放提出连接请求服务的主机的信息（某台主机从某个端口发出该请求）；addrten通常为一    个指向值为sizeof(struct sockaddr_in)的整型指针变量。出现错误时accept函数返回-1    并置相应的errno值。    当accept函数监视的socket收到连接请求时，socket执行体将建立一个新的socket，执行体    将这个新socket和请求连接进程的地址联系起来    */        c_fd = accept(l_fd,(struct sockaddr *)&c_in,&len);        int n = read(c_fd,buf,1024);//read the message send by client        inet_ntop(AF_INET,&c_in.sin_addr,addr_p,16);//“二进制整数” －> “点分十进制  *inet_ntop(int af, const void *src, char *dst, socklen_t cnt);        cout<<"IP: "<<addr_p<<" , Content: "<<buf;        write(c_fd,buf,n);//sent message back to client        close(c_fd);    }    cout<<buf<<endl;    return 0;}

客户端：

#include <stdio.h>#include <unistd.h>#include <sys/types.h>#include <sys/socket.h>#include <arpa/inet.h>#include <string.h>#include <iostream>using namespace std;int main(){    struct sockaddr_in s_in;    char buf[100];    int s_fd;    int port = 8000;    char *str = "socket net program";    char *sip = "127.0.0.1";    memset((void *)&s_in,0,sizeof(s_in));    s_in.sin_family = AF_INET;    s_in.sin_port = htons(port);    inet_pton(AF_INET,sip,(void *)&s_in.sin_addr);    s_fd = socket(AF_INET,SOCK_STREAM,0);    /*    面向连接的客户程序使用connect函数来配置socket并与远端服务器建立一个TCP连接    int connect(int sockfd, struct sockaddr *serv_addr,int addrlen)    sockfd是socket函数返回的socket描述符；serv_addr是包含远端主机IP地址和端口号的指针；    addrlen是远端地址结构的长度    */    connect(s_fd,(struct sockaddr *)&s_in,sizeof(s_in));    cout<<"before: "<<str<<endl;    write(s_fd,str,strlen(str)+1);    read(s_fd,buf,100);    cout<<"after: "<<buf<<endl;    close(s_fd);}

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