【C语言】linux下c语言 客户端服务器编程框架

客户端服务器编程模型：

客户端代码：
#include <stdlib.h>
#include <stdio.h>
#include <errno.h>
#include <string.h>
#include <unistd.h>
#include <netdb.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <sys/types.h>
#include <arpa/inet.h>
#define MAXLINE 100;
#define RIO_BUFSIZE 8192;


int main()
{

int clientfd = socket(AF_INET,SOCK_STREAM,0);  
//创建一个客户端套接字描述符

struct sockaddr_in serveraddr;
struct hostent *hp;
bzero((char *)&serveraddr,sizeof(serveraddr));
serveraddr.sin_family = AF_INET;
serveraddr.sin_port = htons(15636);
serveraddr.sin_addr.s_addr = inet_addr("127.0.0.1");
//创建服务器套接字

connect(clientfd,(struct sockaddr *)&serveraddr,sizeof(serveraddr));
//将客户端套接字描述符与服务器套接字进行连接
printf("connected.\n");
char buf[100];
//定义发送数据缓冲区 while(1){
printf("please input string:\n");
fgets(buf,100,stdin);
//从键盘输入字符串
send(clientfd,buf,100,0);
//将位于buf缓冲区的数据发送到clientfd描述符连接的套接字的IP地址对应的线程
recv(clientfd,buf,100,0);
//从clientfd关联的服务器端进程获得数据。并保存在缓冲区中
printf("%s\n",buf);
}


close(clientfd);
return EXIT_SUCCESS;
}

服务器端代码：

#include <stdlib.h>
#include <stdio.h>
#include <errno.h>
#include <string.h>
#include <unistd.h>
#include <netdb.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <sys/types.h>
#include <arpa/inet.h>
int main()
{

int port=15636 ;
int listenfd = socket(AF_INET, SOCK_STREAM,0);
//创建服务器端套接字描述符，用于监听客户端请求
struct hostent *hp;
struct sockaddr_in serveraddr;
bzero((char *)&serveraddr,sizeof(serveraddr));
serveraddr.sin_family = AF_INET;
serveraddr.sin_addr.s_addr = htonl(INADDR_ANY);
serveraddr.sin_port = htons(port);
//创建用于服务的服务器端套接字，注意与 客户端创建的套接字的区别  IP段里，这里是可以为任何IP提供服务的，客户端里的IP是请求的端点

bind(listenfd,(struct sockaddr *)&serveraddr,sizeof(serveraddr));
//将服务器端的套接字描述符和服务器端套接字相关联

listen(listenfd,1024);
//打开监听
char temp[100];
struct sockaddr_in clientaddr;
int clientlen, connfd;
clientlen = sizeof(clientaddr);
connfd = accept(listenfd,(struct sockaddr *)&clientaddr, &clientlen);
//等待接受客户端的请求，这是一个阻塞函数。若成功接受客户端请求则返回新的套接字描述符，这个描述符用于 send和recv函数
while(1){

recv(connfd,temp,100,0);
printf("%s\n",temp);
fgets(temp,100,stdin);
send(connfd,temp,100,0);
}
//recv接收客户端发送过来的字符串，send发送给客户端字符串
 EXIT_SUCCESS;
}

注意：以上代码只是为了突出客户端服务器编程框架，因为并未判断出错及相关处理方法。

下面为完整代码：

客户端：

//the client code
//copyright  chenglibin  http://blog.csdn.net/chenglibin1988
#include <stdlib.h>#include <stdio.h>#include <errno.h>#include <string.h>#include <unistd.h>#include <netdb.h>#include <sys/socket.h>#include <netinet/in.h>#include <sys/types.h>#include <arpa/inet.h>#define MAXLINE 100;int main(){int clientfd
 = socket(AF_INET,SOCK_STREAM,0);if(clientfd < 0){ perror("socket"); exit(1);}struct sockaddr_in serveraddr;struct hostent *hp;bzero((char *)&serveraddr,sizeof(serveraddr));

serveraddr.sin_family = AF_INET;

serveraddr.sin_port = htons(15636);

serveraddr.sin_addr.s_addr = inet_addr("127.0.0.1");

if(connect(clientfd,(struct sockaddr *)&serveraddr,sizeof(serveraddr)) < 0){

        perror("connect");

        exit(1);

}



printf("connected\n");

char buf[100];

int idata;

while(1){

idata = 0;

printf("input a string:\n");

fgets(buf,100,stdin);

send(clientfd,buf,100,0);

idata = recv(clientfd,buf,100,0);

if(idata < 0){

        perror("recv");

        exit(1);

}



printf("data received from server is:\n %s\n",buf);

}



close(clientfd);

return EXIT_SUCCESS;

}





***************************************************************************************************************************************************************************************
***************************************************************************************************************************************************************************************
服务器端代码如下：

//the server code
//copyright  chenglibin  http://blog.csdn.net/chenglibin1988
#include <stdlib.h>
#include <stdio.h>
#include <errno.h>
#include <string.h>
#include <unistd.h>
#include <netdb.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <sys/types.h>
#include <arpa/inet.h>
#define PORT 15636
int main()
{

int listenfd = socket(AF_INET, SOCK_STREAM,0);
if(listenfd < 0){
        perror("socket");
        exit(1);
}

struct hostent *hp;
struct sockaddr_in serveraddr;
bzero((char *)&serveraddr,sizeof(serveraddr));
serveraddr.sin_family = AF_INET;
serveraddr.sin_addr.s_addr = htonl(INADDR_ANY);
serveraddr.sin_port = htons(PORT);

if(bind(listenfd,(struct sockaddr *)&serveraddr,sizeof(serveraddr)) < 0){
        perror("connect");
        exit(1);
}

if(listen(listenfd,1024) < 0){
        perror("listen error");
        exit(1);
}

char temp[100];
struct sockaddr_in clientaddr;
int clientlen, connfd;
clientlen = sizeof(clientaddr);

connfd = accept(listenfd,(struct sockaddr *)&clientaddr, &clientlen);
if(connfd < 0){
        perror("accept error");
        exit(1);
}

printf("Accepted!\n");

int idata;
while(1){
idata = 0;
idata = recv(connfd,temp,100,0);
if(idata < 0){
perror("recv error");
exit(1);
}
printf("data received from client is :\n%s\n",temp);

printf("input a string:\n");
fgets(temp,100,stdin);
send(connfd,temp,100,0);
}
EXIT_SUCCESS;
}