Ubuntu下用C语言实现客户端服务器交互

Socket-Server.c

#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <errno.h>
#include <string.h>
#include <sys/types.h>

int main(void)
{
int listenfd = 0,connfd = 0;

struct sockaddr_in serv_addr;

char sendBuff[1025];
int numrv;

listenfd = socket(AF_INET, SOCK_STREAM, 0);
printf("socket retrieve success\n");

memset(&serv_addr, '0', sizeof(serv_addr));
memset(sendBuff, '0', sizeof(sendBuff));

serv_addr.sin_family = AF_INET;
serv_addr.sin_addr.s_addr = htonl(INADDR_ANY);
serv_addr.sin_port = htons(5000);

bind(listenfd, (struct sockaddr*)&serv_addr,sizeof(serv_addr));

if(listen(listenfd, 10) == -1){
printf("Failed to listen\n");
return -1;
}

while(1)
{
connfd = accept(listenfd, (struct sockaddr*)NULL ,NULL); // accept awaiting request

strcpy(sendBuff, "Message from server");
write(connfd, sendBuff, strlen(sendBuff));

close(connfd);
sleep(1);
}

return 0;
}

第二步：编译

gcc Server.c -o Socket-Server.out

第三步：执行等待客户端链接

./Socket-Server.out

Socket Client.c

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

int main(void)
{
int sockfd = 0,n = 0;
char recvBuff[1024];
struct sockaddr_in serv_addr;

memset(recvBuff, '0' ,sizeof(recvBuff));
if((sockfd = socket(AF_INET, SOCK_STREAM, 0))< 0)
{
printf("\n Error : Could not create socket \n");
return 1;
}

serv_addr.sin_family = AF_INET;
serv_addr.sin_port = htons(5000);
serv_addr.sin_addr.s_addr = inet_addr("127.0.0.1");

if(connect(sockfd, (struct sockaddr *)&serv_addr, sizeof(serv_addr))<0)
{
printf("\n Error : Connect Failed \n");
return 1;
}

while((n = read(sockfd, recvBuff, sizeof(recvBuff)-1)) > 0)
{
recvBuff
= 0;
if(fputs(recvBuff, stdout) == EOF)
{
printf("\n Error : Fputs error");
}
printf("\n");
}

if( n < 0)
{
printf("\n Read Error \n");
}

return 0;
}

第二步：编译

gcc Client.c -o Socket-Client

第三步：执行链接服务器

./Socket-Client