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1、将TCP的CS模型再敲一遍
服务器
#include myhead.h
#define PORT 8888
#define IP 192.168.124.123
int main(int argc, const char *argv[])
{//创建套接字//绑定本机IP和端口号//监听客户端请求//接收客户端连接请求//收发消息//创建套接字int…作业
1、将TCP的CS模型再敲一遍
服务器
#include myhead.h
#define PORT 8888
#define IP 192.168.124.123
int main(int argc, const char *argv[])
{//创建套接字//绑定本机IP和端口号//监听客户端请求//接收客户端连接请求//收发消息//创建套接字int oldfd ;if((oldfd socket(AF_INET,SOCK_STREAM,0))-1) //创建套接字{perror(socket);return -1;}//端口号快速复用int n 2;if(setsockopt(oldfd,SOL_SOCKET,SO_REUSEADDR,n,sizeof(n))-1){perror(setsockopt);return -1;}//绑定本机IP和端口号struct sockaddr_in server {.sin_family AF_INET,.sin_port htons(PORT),.sin_addr.s_addr inet_addr(IP)};if(bind(oldfd,(struct sockaddr *)server,sizeof(server))-1){perror(bind);return -1;}//监听客户端连接请求client变量接收客户端信息struct sockaddr_in client;int client_len sizeof(client);int newfd;if(newfd accept(oldfd,(struct sockaddr *)client,client_len)-1){perror(accept);return -1;}printf(%s:%d连接\n,inet_ntoa(client.sin_addr),ntohs(client.sin_port));//收发消息char buff[1024];while(1){int res recv(newfd,buff,sizeof(buff),0);if(res 0){printf(客户端退出\n);break;}printf(收到消息%s,收到消息的长度%d\n,buff,res);strcat(buff,霜雪);send(newfd,buff,sizeof(buff),0);bzero(buff,sizeof(buff));}close(newfd);close(oldfd);return 0;
}客户端
#include myhead.h
#define IP 192.168.124.123
#define SERPORT 9999
int main(int argc, const char *argv[])
{//1、创建套接字//2、绑定不是必须绑定//3、连接//4、收发消息int oldfd socket(AF_INET,SOCK_STREAM,0);if(oldfd-1){perror(socket);return -1;}
#if 0//绑定固定的IP和端口号(不是必须的)struct sockaddr_in client {.sin_family AF_INET,.sin_port htons(7899),//自定义端口号.sin_addr.s_addr inet_addr(192.168.124.34)};if(bind(oldfd,(struct sockaddr *)client,sizeof(client))-1){perror(bind);return -1;}
#endif//连接服务器struct sockaddr_in server {.sin_family AF_INET,.sin_port htons(SERPORT),//注意端口号需要服务器端口.sin_addr.s_addr inet_addr(IP)};if(connect(oldfd,(struct sockaddr *)server,sizeof(server))-1){perror(connect);return -1;}//收发消息char buff[1024];while(1){fgets(buff,sizeof(buff),stdin);buff[strlen(buff)-1] \0;send(oldfd,buff,sizeof(buff),0);if(strcmp(buff,quit)0)//退出客户端{break;}bzero(buff,sizeof(buff));recv(oldfd,buff,sizeof(buff),0);//阻塞接收服务器消息printf(服务器发来消息%s\n,buff);}close(oldfd);return 0;
}
2、UDP服务器中使用connect函数实现唯一的客户端与服务器通话。
服务器
#include myhead.h
#define PORT 8888#define IP 192.168.124.123int main(int argc, const char *argv[])
{//创建套接字int oldfd socket(AF_INET,SOCK_DGRAM,0);if(oldfd -1){perror(socket);return -1;}//绑定struct sockaddr_in server {.sin_family AF_INET,.sin_port htons(PORT),.sin_addr.s_addr inet_addr(IP)};if(bind (oldfd,(struct sockaddr *)server,sizeof(server))-1){perror(bind);return -1;}struct sockaddr_in client;int client_len sizeof(client);char buff[1024];int flag 0;while(1){recvfrom(oldfd,buff,sizeof(buff),0,(struct sockaddr *)client,client_len);printf(%s:%d信息%s\n,inet_ntoa(client.sin_addr),ntohs(client.sin_port),buff);if(connect(oldfd,(struct sockaddr *)client,sizeof(client))-1){perror(connect);return -1;}while(1){int res recvfrom(oldfd,buff,sizeof(buff),0,NULL,NULL);printf(%s\n,buff);strcat(buff,周日还要上课吴);sendto(oldfd,buff,sizeof(buff),0,NULL,0);bzero(buff,sizeof(buff));if(res 0){printf(退出客户端\n);break;}}}return 0;
}客户端
#include myhead.h
#define IP 192.168.124.123
#define PORT 8888
int main(int argc, const char *argv[])
{//1、创建套接字int oldfd socket(AF_INET,SOCK_DGRAM,0);if(oldfd-1){perror(socket);return -1;}//2、收发消息struct sockaddr_in server {.sin_family AF_INET,.sin_port htons(PORT),.sin_addr.s_addr inet_addr(IP)};if(connect(oldfd,(struct sockaddr *)server,sizeof(server))-1){perror(connect);return -1;} char buff[1024];while(1){fgets(buff,sizeof(buff),stdin);buff[strlen(buff)-1] \0;sendto(oldfd,buff,sizeof(buff),0,(struct sockaddr *)server,sizeof(server));bzero(buff,sizeof(buff));recvfrom(oldfd,buff,sizeof(buff),0,NULL,NULL);printf(接收服务器信息%s\n,buff);}return 0;
}笔记整理
流程图 UDP服务器 1、创建套接字。 2、绑定本机IP和端口号。 3、收发消息由于不知道对方是谁对方也不知道您是谁所以在发送时附带自己的信息接收时接收对方信息。 UDP相关API #include sys/types.h #include sys/socket.h ssize_t sendto(int sockfd, const void *buf, size_t len, int flags, const struct sockaddr *dest_addr, socklen_t addrlen); 功能发送信息函数 参数1套接字 参数2发送的信息 参数3信息大小 参数4 0阻塞接收 MSG_DONTWAIT:费阻塞接收 参数5填写发送目标的IP和端口号 参数6参数5的大小。 返回值成功返回发送的字节个数失败返回-1并置位错误码。 #include sys/types.h #include sys/socket.h ssize_t recvfrom(int sockfd, void *buf, size_t len, int flags, struct sockaddr *src_addr, socklen_t *addrlen); 功能接收信息函数 参数1套接字 参数2发送的信息 参数3信息大小 参数4 0阻塞接收 MSG_DONTWAIT:费阻塞接收 参数5自动填充发信息的主机信息。 返回值成功返回发送的字节个数失败返回-1并置位错误码。 、UDP服务器
#include myhead.h
#define PORT 8888
#define IP 192.168.124.34int main(int argc, const char *argv[])
{//1、创建UDP套接字int oldfd socket(AF_INET,SOCK_DGRAM,0);if(oldfd-1){perror(socket);return -1;}//2、绑定struct sockaddr_in server {.sin_family AF_INET,.sin_port htons(PORT),.sin_addr .s_addr inet_addr(IP)};if(bind(oldfd,(struct sockaddr *)server,sizeof(server))-1){perror(bind);return -1;}//收发消息struct sockaddr_in client;int client_len sizeof(client);char buff[1024];while(1){//接收客户端消息时会将客户端信息写入clientrecvfrom(oldfd,buff,sizeof(buff),0,(struct sockaddr *)client,client_len);printf(收到%s%d的消息%s\n,inet_ntoa(client.sin_addr),ntohs(client.sin_port),buff);strcat(buff,元旦不放假难受);sendto(oldfd,buff,sizeof(buff),0,(struct sockaddr *)client,sizeof(client));//收到谁的信息就发给谁}return 0;
}
4、UDP客户端 1、创建套接字 2、收发消息 #include myhead.h
#define IP 192.168.124.34
#define PORT 8888
int main(int argc, const char *argv[])
{//1、创建套接字int oldfd socket(AF_INET,SOCK_DGRAM,0);if(oldfd-1){perror(socket);return -1;}//2、收发消息struct sockaddr_in server {.sin_family AF_INET,.sin_port htons(PORT),.sin_addr.s_addr inet_addr(IP)};char buff[1024];while(1){fgets(buff,sizeof(buff),stdin);buff[strlen(buff)-1] \0;sendto(oldfd,buff,sizeof(buff),0,(struct sockaddr *)server,sizeof(server));bzero(buff,sizeof(buff));recvfrom(oldfd,buff,sizeof(buff),0,NULL,NULL);printf(接收服务器信息%s\n,buff);}return 0;
} 思维导图
