网络编程知识点总结（5）

socket客户端代码实现

相关函数

（1）socket()函数

int socket(int domain, int type, int protocol);

（2）bind()函数: IP号端口号与相应描述字赋值函数

int bind(int sockfd, const struct sockaddr *addr,socklen t addrlen);

（3）listen()函数:监听设置函数

int listen(int sockfd, int backlog);

（4）accept()函数

int accept(int sockfd, struct sockaddr *addr, socklen t *addrlen);

服务端代码实现：

#include 
#include 
#include 
#include 
#include 
#include 
#include 

int main()
{
        int s_fd;
        int n_read;
        char readBuf[128];

        char *msg = "I get your connect";
        struct sockaddr_in s_addr;
        struct sockaddr_in c_addr;

        memset(&s_addr,0,sizeof(struct sockaddr_in));
        memset(&c_addr,0,sizeof(struct sockaddr_in));

        //1.socket
        s_fd = socket(AF_INET,SOCK_STREAM,0);
        if(s_fd == -1)
		{
                perror("socket");
                exit(-1);
        }

        s_addr.sin_family = AF_INET;
        s_addr.sin_port = htons(8989);
        inet_aton("10.100.13.165",&s_addr.sin_addr);

        //2.bind
        bind(s_fd,(struct sockaddr *)&s_addr,sizeof(struct sockaddr_in));

        //3.listen 
        listen(s_fd,10);

        //4.accept
        int clen = sizeof(struct sockaddr_in);
        int c_fd = accept(s_fd,(struct sockaddr *)&c_addr,&clen);
        if(c_fd == -1)
        {
                perror("accept");
        }

        printf("get connect:%s\n",inet_ntoa(c_addr.sin_addr));
        //5.read
        n_read = read(c_fd,readBuf,128);
        if(n_read == -1)
        {
                perror("read");
        }
        else
        {
                printf("get message:%d,%s\n",n_read,readBuf);
        }
        //6.write
        write(c_fd,msg,strlen(msg));

        return 0;

}

客户端代码实现：

#include 
#include 
#include 
#include 
#include 
#include 
#include 

int main()
{
        int c_fd;
        int n_read;
        char readBuf[128];

        char *msg = "msg form client";
        struct sockaddr_in c_addr;

        memset(&c_addr,0,sizeof(struct sockaddr_in));

        //1.socket
        c_fd = socket(AF_INET,SOCK_STREAM,0);
        if(c_fd == -1)
        {
                perror("socket");
                exit(-1);
        }

        c_addr.sin_family = AF_INET;
        c_addr.sin_port = htons(8989);
        inet_aton("10.100.13.165",&c_addr.sin_addr);

        //2.connect
        if(connect(c_fd,(struct sockaddr *)&c_addr,sizeof(struct sockaddr)) == -1)
        {
                perror("connect");
                exit(-1);
        }

        //3.send
        write(c_fd,msg,strlen(msg));

        //4.read
        n_read = read(c_fd,readBuf,128);
        if(n_read == -1)
        {
                perror("read");
		}
        else
        {
                printf("get message from server:%d,%s\n",n_read,readBuf);
        }

        return 0;

}

编译结果：