網絡通信之tcp編程

 

 

代碼：

服務端

#include <stdio.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <string.h>
#include <netinet/in.h>
#include <errno.h>

int main(int argc, char **argv)
{
 int fd, client_fd;
 struct sockaddr_in localadd, remoteadd;
 int ret;
 char buf[1024];
 int len;
 
 fd = socket(AF_INET, SOCK_STREAM, 0);
 if (fd < 0)
 {
  printf("socker() error!\n");
  goto exit;
 }
 
 localadd.sin_family = AF_INET;
 localadd.sin_port = htons(5000);
 localadd.sin_addr.s_addr = htonl(INADDR_ANY);
 
 len = sizeof(localadd);
 ret = bind(fd, (struct sockaddr *)&localadd, len);
 if (ret < 0)
 {
  printf("bind() error!\n");
  goto exit;
 }
 
 ret = listen(fd, 5);
 if (ret < 0)
 {
  printf("listen() error!\n");
  goto exit;
 }
 
 len = sizeof(remoteadd);
 client_fd = accept(fd, (struct sockaddr *)&remoteadd, &len);
 if ( client_fd < 0)
 {
  printf("accept() error!\n");
  goto exit;
 }
 else
 {
  printf("server recieve connect!\n");
 }
 
 while (1)
 {
  printf("waiting for ...\n");
  fflush(stdout);
  
  ret = recv(client_fd, (void *)buf, 1024, 0);
  if (ret < 0)
  {
   printf("server recieve data failed!\n");
  }
  else
  {
   printf("server read lind: %s\n", buf);
  }
  
  memset(buf,  0x00, sizeof(buf));
  printf("you send msg:");
  scanf("%s", buf);
  if (strcmp(buf, "exit") == 0)
  {
   printf("exit server\n");
   goto exit;
  }
  sleep(1);
  
  ret = send(client_fd, (void *)buf, strlen(buf), 0);
  if (ret < 0)
  {
   printf("server send() error!\n");
  }
  memset(buf, 0x00, sizeof(buf));
 }
 
 
exit:
 close(client_fd);
 printf("close client\n");
 return 0;
}

 

客服端：

#include <stdio.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <string.h>

int main(int argc, char **argv)
{
 int fd;
 int ret;
 struct sockaddr_in remoteaddr;
 char buf[1024];
 int len;
 
 fd = socket(AF_INET, SOCK_STREAM, 0);
 if (fd < 0)
 {
  printf("socker() error!\n");
  goto exit;
 }
 
 remoteaddr.sin_family = AF_INET;
 remoteaddr.sin_port = htons(5000);
 remoteaddr.sin_addr.s_addr = inet_addr("192.168.1.229");
 
 len = sizeof(remoteaddr);
 ret = connect(fd, (struct sockaddr *)&remoteaddr, len);
 if (ret < 0)
 {
  printf("connect() error!\n");
  goto exit;
 }
 
 while (1)
 {
  printf("you send msg:");
  scanf("%s", buf);
  if (strcmp(buf, "exit") == 0)
  {
   printf("exit server\n");
   goto exit;
  }
  sleep(1);
  
  ret = send(fd, (void *)buf, strlen(buf), 0);
  if (ret < 0)
  {
   printf("server send() error!\n");
  }
  
  bzero(buf, 1024);
  
  ret = recv(fd, (void *)buf, 1024, 0);
  if (ret < 0)
  {
   printf("server recieve data failed!\n");
  }
  else
  {
   printf("server read lind: %s\n", buf);
  }
  bzero(buf, 1024);
 }

exit:
 close(fd);
 return 0;
}