socket的TCP通信简单例子

    
    
/*
tcp客户端程序，注意一定要修改addr的值和本机相同才能正常工作
*/
#include <stdio.h>
#include <unistd.h>
#include <sys/types.h> /* See NOTES */
#include <sys/socket.h>
#include <arpa/inet.h>
#include <string.h>
#include <netinet/in.h>
#include <stdlib.h>
#include <errno.h>

int main(void)
{
int sock;
int server_len;
struct sockaddr_in server_address;

sock = socket(PF_INET, SOCK_STREAM, 0); //创建SOCKET
server_address.sin_family = AF_INET; //指定通讯协议
server_address.sin_addr.s_addr = htonl(INADDR_ANY); //或是指定当前IP地址inet_addr(“192.168.88.123”);
server_address.sin_port = htons( 12345);
connect(sock,(struct sockaddr*)&server_address, sizeof(server_address));

char sendbuf[ 1024]={ 0};
char recvbuf[ 1024]={ 0};

while(fgets(sendbuf, sizeof(sendbuf), stdin) != NULL)
{
write(sock,sendbuf, sizeof(sendbuf));
read(sock,recvbuf, sizeof(recvbuf));
fputs(recvbuf, stdout);
memset(sendbuf, 0, sizeof(sendbuf));
memset(recvbuf, 0, sizeof(recvbuf));
}
close(sock);
return 0;
}
    
    

    
    
#include <stdio.h>
#include <unistd.h>
/*
tcp服务器程序
*/
#include <sys/types.h> /* See NOTES */
#include <sys/socket.h>
#include <arpa/inet.h>
#include <string.h>
#include <netinet/in.h>
#include <stdlib.h>
#include <errno.h>

int main(void)
{
int server_sockfd,client_sockfd;
int server_len,client_len;
struct sockaddr_in server_address,client_address;

server_sockfd = socket(PF_INET, SOCK_STREAM, 0); //创建SOCKET
server_address.sin_family = AF_INET; //指定通讯协议
server_address.sin_addr.s_addr = htonl(INADDR_ANY); //相当于0.0.0.0
server_address.sin_port = htons( 12345);
server_len = sizeof(server_address);

bind(server_sockfd, (struct sockaddr *)&server_address, server_len); //绑定SOCKET对象
listen(server_sockfd, SOMAXCONN);
printf( "SOMAXCONN:%d\n",SOMAXCONN);
client_len= sizeof(client_address);
client_sockfd=accept(server_sockfd, (struct sockaddr *)&client_address, ( socklen_t *)&client_len);
char recvbuf[ 1024];
while( 1)
{
memset(recvbuf, 0, sizeof(recvbuf));
read(client_sockfd, recvbuf, sizeof(recvbuf));
fputs(recvbuf, stdout);
write(client_sockfd,recvbuf, sizeof(recvbuf));
}

close(server_sockfd);
close(client_sockfd);
return 0;
}
    
    

  
  
/*
tcp客户端程序，注意一定要修改addr的值和本机相同才能正常工作
*/
#include <stdio.h>
#include <unistd.h>
#include <sys/types.h> /* See NOTES */
#include <sys/socket.h>
#include <arpa/inet.h>
#include <string.h>
#include <netinet/in.h>
#include <stdlib.h>
#include <errno.h>

int main(void)
{
int sock;
int server_len;
struct sockaddr_in server_address;

sock = socket(PF_INET, SOCK_STREAM, 0); //创建SOCKET
server_address.sin_family = AF_INET; //指定通讯协议
server_address.sin_addr.s_addr = htonl(INADDR_ANY); //或是指定当前IP地址inet_addr(“192.168.88.123”);
server_address.sin_port = htons( 12345);
connect(sock,(struct sockaddr*)&server_address, sizeof(server_address));

char sendbuf[ 1024]={ 0};
char recvbuf[ 1024]={ 0};

while(fgets(sendbuf, sizeof(sendbuf), stdin) != NULL)
{
write(sock,sendbuf, sizeof(sendbuf));
read(sock,recvbuf, sizeof(recvbuf));
fputs(recvbuf, stdout);
memset(sendbuf, 0, sizeof(sendbuf));
memset(recvbuf, 0, sizeof(recvbuf));
}
close(sock);
return 0;
}
  
  

  
  
#include <stdio.h>
#include <unistd.h>
/*
tcp服务器程序
*/
#include <sys/types.h> /* See NOTES */
#include <sys/socket.h>
#include <arpa/inet.h>
#include <string.h>
#include <netinet/in.h>
#include <stdlib.h>
#include <errno.h>

int main(void)
{
int server_sockfd,client_sockfd;
int server_len,client_len;
struct sockaddr_in server_address,client_address;

server_sockfd = socket(PF_INET, SOCK_STREAM, 0); //创建SOCKET
server_address.sin_family = AF_INET; //指定通讯协议
server_address.sin_addr.s_addr = htonl(INADDR_ANY); //相当于0.0.0.0
server_address.sin_port = htons( 12345);
server_len = sizeof(server_address);

bind(server_sockfd, (struct sockaddr *)&server_address, server_len); //绑定SOCKET对象
listen(server_sockfd, SOMAXCONN);
printf( "SOMAXCONN:%d\n",SOMAXCONN);
client_len= sizeof(client_address);
client_sockfd=accept(server_sockfd, (struct sockaddr *)&client_address, ( socklen_t *)&client_len);
char recvbuf[ 1024];
while( 1)
{
memset(recvbuf, 0, sizeof(recvbuf));
read(client_sockfd, recvbuf, sizeof(recvbuf));
fputs(recvbuf, stdout);
write(client_sockfd,recvbuf, sizeof(recvbuf));
}

close(server_sockfd);
close(client_sockfd);
return 0;
}