环境是linux,不过应该没什么影响,因为只用到了socket的基本用法,没有涉及pthread等。
分为服务器端和客户端,服务器端监听端口发来的请求,收到后向客户端发送一个Hello World,客户机负责发送消息并打印收到的Hello World.
服务器步骤:建立socket,绑定socket和地址信息,开启监听,收到请求后发送数据。
客户端步骤:建立socket,连接服务器端,接收并打印服务器给的数据。
服务器端代码:
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#define MYPORT 8887
#define QUEUE 20
#define BUFFER_SIZE 1024
int main()
{
///定义sockfd
int server_sockfd = socket(AF_INET,SOCK_STREAM, 0);
///定义sockaddr_in
struct sockaddr_in server_sockaddr;
server_sockaddr.sin_family = AF_INET;
server_sockaddr.sin_port = htons(MYPORT);
server_sockaddr.sin_addr.s_addr = htonl(INADDR_ANY);
///bind,成功返回0,出错返回-1
if(bind(server_sockfd,(struct sockaddr *)&server_sockaddr,sizeof(server_sockaddr))==-1)
{
perror("bind");
exit(1);
}
///listen,成功返回0,出错返回-1
if(listen(server_sockfd,QUEUE) == -1)
{
perror("listen");
exit(1);
}
///客户端套接字
char buffer[BUFFER_SIZE];
struct sockaddr_in client_addr;
socklen_t length = sizeof(client_addr);
///成功返回非负描述字,出错返回-1
int conn = accept(server_sockfd, (struct sockaddr*)&client_addr, &length);
if(conn<0)
{
perror("connect");
exit(1);
}
while(1)
{
memset(buffer,0,sizeof(buffer));
int len = recv(conn, buffer, sizeof(buffer),0);
if(strcmp(buffer,"exit
")==0)
break;
fputs(buffer, stdout);
send(conn, buffer, len, 0);
}
close(conn);
close(server_sockfd);
return 0;
}
客户端代码:
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#define MYPORT 8887
#define BUFFER_SIZE 1024
int main()
{
///定义sockfd
int sock_cli = socket(AF_INET,SOCK_STREAM, 0);
///定义sockaddr_in
struct sockaddr_in servaddr;
memset(&servaddr, 0, sizeof(servaddr));
servaddr.sin_family = AF_INET;
servaddr.sin_port = htons(MYPORT); ///服务器端口
servaddr.sin_addr.s_addr = inet_addr("127.0.0.1"); ///服务器ip
///连接服务器,成功返回0,错误返回-1
if (connect(sock_cli, (struct sockaddr *)&servaddr, sizeof(servaddr)) < 0)
{
perror("connect");
exit(1);
}
char sendbuf[BUFFER_SIZE];
char recvbuf[BUFFER_SIZE];
while (fgets(sendbuf, sizeof(sendbuf), stdin) != NULL)
{
send(sock_cli, sendbuf, strlen(sendbuf),0); ///发送
if(strcmp(sendbuf,"exit
")==0)
break;
recv(sock_cli, recvbuf, sizeof(recvbuf),0); ///接收
fputs(recvbuf, stdout);
memset(sendbuf, 0, sizeof(sendbuf));
memset(recvbuf, 0, sizeof(recvbuf));
}
close(sock_cli);
return 0;
}
实验结果: