一.基于TCP的服务器和客户端之间的通信
1.服务器端
#include
#include
#include
#include
#include
#include
#define PORT 8888
#define BUF_LEN 100
int main(int argc,char **argv)
{
int socketfd;
int ret;
int len;
char buf[BUF_LEN] = {0};
ssize_t clientfd;
ssize_t buf_len;//接收的数据长度
struct sockaddr_in server;
struct sockaddr_in client;
len = sizeof(client);
/**
*socket(int sockfd,const struct aockaddr *addr,)
* */
//服务器的创建
//创建服务器端通信套接口
socketfd = socket(AF_INET,SOCK_STREAM,0);
if(socketfd < 0)
{
perror("socket");
return -1;
}
bzero(&server,sizeof(server));
server.sin_family = AF_INET;
server.sin_port = htons(PORT);
server.sin_addr.s_addr = inet_addr(argv[1]);
//绑定地址
ret = bind(socketfd,(struct sockaddr *)&server,len);
if(ret < 0)
{
perror("bind");
return -1;
}
//设置监听队列
ret = listen(socketfd,4);
if(ret< 0)
{
perror("listen");
return -1;
}
//接收由客户端传来的数据
while(1)
{
printf("1\n");
clientfd = accept(socketfd,(struct sockaddr *)&client,&len);
printf("2\n");
if(clientfd < 0)
{
perror("accept");
// return -1;
}
printf("accepted a new connection\n");
printf("new socket id is %d\n",clientfd);
printf("Accept client ip is %s\n",inet_ntoa(client.sin_addr));
printf("start to recv...\n");
while(1)
{
//接收来自客户端的数据
buf_len = recv(clientfd,buf,BUF_LEN,0);
if(buf_len < 0)
{
perror("recv");
return -1;
}
else if(buf > 0)
{
if(strcmp(buf,"exit") == 0)
{
printf("client is closed\n");
close(clientfd);
break;
}
printf("buf %s\n",buf);
}
}
}
//关闭socket
close(clientfd);
close(socketfd);
return 0;
}
2.客户端
#include
#include
#include
#include
#include
#include
#define PORT 8888
#define MAX_LEN 100
int main(int argc,char **argv)
{
int socketfd;
int serverfd;
int ret;
char buf[MAX_LEN];
struct sockaddr_in server;
//创建TCP通信socket
socketfd = socket(AF_INET,SOCK_STREAM,0);
if(socketfd < 0)
{
perror("socket");
return -1;
}
//将空间清零
bzero(&server,sizeof(server));
目的地址
server.sin_family = AF_INET;
server.sin_port = htons(PORT);
server.sin_addr.s_addr = inet_addr(argv[1]);
请求连接目标地址
serverfd = connect(socketfd,(struct sockaddr *)&server,sizeof(server));
if(serverfd < 0)
{
perror("connect");
return -1;
}
printf("connect success\n");
while(1)
{
//将键盘键入的内容进行传输
printf("please input buf:");
scanf("%s",buf);
//当键入的字符串为exit时,关闭客户端
if(strcmp(buf,"exit") == 0)
{
ret = send(socketfd,buf,sizeof(buf),0);
if(ret < 0)
{
perror("send");
return -1;
}
break;
}
ret = send(socketfd,buf,sizeof(buf),0);
if(ret < 0)
{
perror("send");
return -1;
}
}
return 0;
}
二.基于UDP的服务器和客户端之间的通信
1.服务器端
#include
#include
#include
#include
#include
#include
#include
#include
#define PORT 9999
int main(int argc,char **argv)
{
int socket_fd;
int ret;
struct sockaddr_in server_addr;
struct sockaddr_in client_addr;
int len = sizeof(struct sockaddr_in);
char buf[100] = {0};
int recv_len;
//创建UDP通信socket
socket_fd = socket(AF_INET,SOCK_DGRAM,0);
if(socket_fd < 0)
{
perror("socket");
return -1;
}
//将空间清空
bzero(&server_addr,sizeof(server_addr));
目的地址
server_addr.sin_family = AF_INET;
server_addr.sin_port = htons(PORT);
server_addr.sin_addr.s_addr = inet_addr((const char *)argv[1]);
//绑定地址
ret = bind(socket_fd,(struct sockaddr *)&server_addr,sizeof(server_addr));
if(ret < 0)
{
perror("bind");
return -1;
}
while(1)
{
//接收从客户端传输的数据
recv_len = recvfrom(socket_fd,buf,100,0,(struct sockaddr *)&client_addr,&len);
if(recv_len < 0)
{
perror("recvfrom");
return -1;
}
printf("buf is %s\n",buf);
memset(buf,0,100);
}
close(socket_fd);
return 0;
}
2.客户端
#include
#include
#include
#include
#include
#include
#include
#include
#define PORT 9999
#define MAX_SIZE 100
int main(int argc,char **argv)
{
int socket_fd;
struct sockaddr_in server_addr;
int len = sizeof(struct sockaddr_in);
char buf[MAX_SIZE] = {0};
int send_len;
创建UDP通信socket
socket_fd = socket(AF_INET,SOCK_DGRAM,0);
if(socket_fd < 0)
{
perror("socket");
return -1;
}
//将空间清空
bzero(&server_addr,sizeof(struct sockaddr_in));
//目的地址
server_addr.sin_family = AF_INET;//IPv4协议
server_addr.sin_port = htons(PORT);//端口
server_addr.sin_addr.s_addr = inet_addr((const char *)argv[1]);
while(1)
{
//键盘键入内容进行传输
printf("input:\n");
scanf("%s",buf);
send_len = sendto(socket_fd,buf,MAX_SIZE,0,(struct sockaddr *)&server_addr,len);
}
//关闭socket
close(socket_fd);
return 0;
}