client.c

来自「cs89000的驱动编写。很有助于新手学习。本人看了以后觉得受益非浅。在此与大家」· C语言 代码 · 共 78 行

#include <stdio.h>

#include <sys/socket.h>

#include <unistd.h>

#include <sys/types.h>

#include <netinet/in.h>

#include <stdlib.h>

 

#define SERVER_PORT 12345 // define the defualt connect port id

#define CLIENT_PORT 12345 // define the defualt client port as a random port

 
#define BUFFER_SIZE 255
#define REUQEST_MESSAGE "welcome to connect the server.\n"

int main(int argc, char **argv)
{     
       int servfd,clifd,length = 0;

       struct sockaddr_in servaddr,cliaddr;
       socklen_t socklen = sizeof(servaddr);
       char buf[BUFFER_SIZE];


while(1){
       if ((clifd = socket(AF_INET,SOCK_STREAM,0)) < 0)
       {
              printf("create socket error!\n");
              exit(1);
       }

       srand(time(NULL));//initialize random generator
       bzero(&cliaddr,sizeof(cliaddr));
       cliaddr.sin_family = AF_INET;
       cliaddr.sin_port = htons(CLIENT_PORT);
       cliaddr.sin_addr.s_addr = htons(INADDR_ANY);

       servaddr.sin_family = AF_INET;
       inet_aton("192.168.1.248",&servaddr.sin_addr);
       servaddr.sin_port = htons(SERVER_PORT);

       //servaddr.sin_addr.s_addr = htons("192.168.1.4");
/*
       if (bind(clifd,(struct sockaddr*)&cliaddr,sizeof(cliaddr))<0)
       {
              printf("bind to port %d failure!\n",CLIENT_PORT);
              exit(1);
       }
*/
       if (connect(clifd,(struct sockaddr*)&servaddr, socklen) < 0)
       {
              printf("can't connect to %s!\n",argv[1]);
              exit(1);
       }
       

       length = recv(clifd,buf,BUFFER_SIZE,0);

       if (length < 0)
       {
              printf("error comes when recieve data from server %s!",argv[1]);
              exit(1);
       }

       printf("from server %s :\n\t%s ",argv[1],buf);
//sleep(2);
       close(clifd);
}
       return 0;
}