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等待客户端的连接
#include#include #include #include #include #include #include int main(){ int sfp,nfp; //定义两个描述符struct sockaddr_in s_add,c_add;int sin_size;unsigned short portnum=0x8888; //服务端使用端口printf("Hello,welcome to my server !\r\n");sfp = socket(AF_INET,SOCK_STREAM, 0);if(-1 == sfp){ printf("socket fail ! \r\n");return -1;}printf("socket ok !\r\n");//填充服务器端口地址信息,以便下面使用此地址和端口监听bzero(&s_add,sizeof(struct sockaddr_in));s_add.sin_family=AF_INET;s_add.sin_addr.s_addr=htonl(INADDR_ANY);//地址使用全0,即所有s_add.sin_port=htons(portnum);//使用bind进行端口绑定if(-1 == bind(sfp,(struct sockaddr *)(&s_add), sizeof(struct sockaddr))){ printf("bind fail !\r\n");return -1;}printf("bind ok !\r\n");//开始监听相应的端口if(-1 == listen(sfp,5)){ printf("listen fail !\r\n");return -1;}printf("listen ok\r\n");while(1){ sin_size = sizeof(struct sockaddr_in);/*accept服务端使用函数,调用时即进入阻塞状态,等待用户进行连接,在没有客户端进行连接时,程序停止在此处, 不会看到后面的打印,当有客户端进行连接时,程序马上执行一次,然后再次循环到此处继续等待。 此处accept的第二个参数用于获取客户端的端口和地址信息。*/nfp = accept(sfp, (struct sockaddr *)(&c_add), &sin_size);if(-1 == nfp){ printf("accept fail !\r\n");return -1;}printf("accept ok!\r\nServer start get connect from %s : %#x\r\n",inet_ntoa(c_add.sin_addr),c_add.sin_port);if(-1 == send(nfp,"hello,welcome to my server \r\n",32,0)){ printf("write fail!\r\n");return -1;}printf("write ok!\r\n");close(nfp);}close(sfp);return 0;}
#include#include #include #include #include #include #include #include int main(){ int cfd; //客户端套接字int recbytes;int sin_size;char buffer[1024]={ 0};struct sockaddr_in s_add,c_add;unsigned short portnum=0x8888;char *s=NULL;printf("Hello,welcome to client !\r\n");cfd = socket(AF_INET, SOCK_STREAM, 0);if(-1 == cfd){ printf("socket fail ! \r\n");return -1;}printf("socket ok !\r\n");bzero(&s_add,sizeof(struct sockaddr_in));s_add.sin_family=AF_INET;s_add.sin_addr.s_addr= inet_addr("127.0.0.1");s_add.sin_port=htons(portnum);s=inet_ntoa(*(struct in_addr*)&s_add.sin_addr.s_addr);printf("server ip is:%s,port is:%#x\r\n",s,s_add.sin_port);if(-1 == connect(cfd,(struct sockaddr *)(&s_add), sizeof(struct sockaddr))){ printf("connect fail !\r\n");return -1;}printf("connect ok !\r\n");if(-1 == (recbytes = recv(cfd,buffer,1024,0))){ printf("read data fail !\r\n");return -1;}printf("read ok\r\nREC:\r\n");buffer[recbytes]='\0';printf("%s\r\n",buffer);getchar();close(cfd);return 0;}
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