linux socket通信编程之c语言(客户端和服务器程序)

来源：互联网发布：网络社交平台有哪些编辑：程序博客网时间：2024/05/23 13:37

最近在学习socket编程，在网上找到一个很好的实例，于是按自己的想把代码修改了一下，算半原创了~~~~

要保存起来常复习呀~~~

///////////////////////////////////////////////////////////////////////////////////

//服务器端代码:server.c
///////////////////////////////////////////////////////////////////////////////////
//本文件是服务器的代码
#include <netinet/in.h> // for sockaddr_in
#include <sys/types.h> // for socket
#include <sys/socket.h> // for socket
#include <stdio.h> // for printf
#include <stdlib.h> // for exit
#include <string.h> // for bzero

#define HELLO_WORLD_SERVER_PORT 6666
#define LENGTH_OF_LISTEN_QUEUE 20
#define BUFFER_SIZE 1024

int main(int argc, char **argv)
{
//设置一个socket地址结构server_addr,代表服务器internet地址, 端口
struct sockaddr_in server_addr;
bzero(&server_addr,sizeof(server_addr)); //把一段内存区的内容全部设置为0
server_addr.sin_family = AF_INET;
server_addr.sin_addr.s_addr = htons(INADDR_ANY);
server_addr.sin_port = htons(HELLO_WORLD_SERVER_PORT);
int times = 0;

//创建用于internet的流协议(TCP)socket,用server_socket代表服务器socket
int server_socket = socket(AF_INET,SOCK_STREAM,0);
if( server_socket < 0)
{
printf("Create Socket Failed!");
exit(1);
}

//把socket和socket地址结构联系起来
if( bind(server_socket,(struct sockaddr*)&server_addr,sizeof(server_addr)))
{
printf("Server Bind Port : %d Failed!", HELLO_WORLD_SERVER_PORT);
exit(1);
}

//server_socket用于监听
if ( listen(server_socket, LENGTH_OF_LISTEN_QUEUE) )
{
printf("Server Listen Failed!");
exit(1);
}

while (1) //服务器端要一直运行
{
//定义客户端的socket地址结构client_addr
struct sockaddr_in client_addr;
socklen_t length = sizeof(client_addr);

//接受一个到server_socket代表的socket的一个连接
//如果没有连接请求,就等待到有连接请求--这是accept函数的特性
//accept函数返回一个新的socket,这个socket(new_server_socket)用于同连接到的客户的通信
//new_server_socket代表了服务器和客户端之间的一个通信通道
//accept函数把连接到的客户端信息填写到客户端的socket地址结构client_addr中
int new_server_socket = accept(server_socket,(struct sockaddr*)&client_addr,&length);
if ( new_server_socket < 0)
{
printf("Server Accept Failed!\n");
break;
} else {
times++;
printf("connect times: %d\n", times);

}

char buffer[BUFFER_SIZE];
bzero(buffer, BUFFER_SIZE);
strcpy(buffer,"Connect success, form server!");
strcat(buffer,"\n"); //C语言字符串连接
//发送buffer中的字符串到new_server_socket,实际是给客户端
send(new_server_socket,buffer,BUFFER_SIZE,0);

while(1) {
bzero(buffer,BUFFER_SIZE);
//接收客户端发送来的信息到buffer中
length = recv(new_server_socket,buffer,BUFFER_SIZE,0);
if (length < 0)
{
printf("Server Recieve Data Failed!\n");
exit(1);
}
printf("%s\n",buffer);
if(strcmp(buffer,"exit")== 0)
{
//关闭与客户端的连接
printf("server:close the current connect!\n");
printf("------------------------------------------------\n");
close(new_server_socket);
break;
}
}
}
//关闭监听用的socket
close(server_socket);
return 0;

}

//////////////////////////////////////////////////////////////////////////////////////////
//客户端代码: client.c
/////////////////////////////////////////////////////////////////////////////////////////
//本文件是客户机的代码
#include <netinet/in.h> // for sockaddr_in
#include <sys/types.h> // for socket
#include <sys/socket.h> // for socket
#include <stdio.h> // for printf
#include <stdlib.h> // for exit
#include <string.h> // for bzero
#include <errno.h> //for error

#define HELLO_WORLD_SERVER_PORT 6666
#define BUFFER_SIZE 1024

int main(int argc, char **argv)
{
if (argc != 2)
{
printf("Usage: ./%s ServerIPAddress\n",argv[0]);
exit(1);
}

//设置一个socket地址结构client_addr,代表客户机internet地址, 端口
struct sockaddr_in client_addr;
bzero(&client_addr,sizeof(client_addr)); //把一段内存区的内容全部设置为0
client_addr.sin_family = AF_INET; //internet协议族
client_addr.sin_addr.s_addr = htons(INADDR_ANY);//INADDR_ANY表示自动获取本机地址
client_addr.sin_port = htons(0); //0表示让系统自动分配一个空闲端口
//创建用于internet的流协议(TCP)socket,用client_socket代表客户机socket
int client_socket = socket(AF_INET,SOCK_STREAM,0);
if( client_socket < 0)
{
printf("Create Socket Failed!\n");
exit(1);
}
//把客户机的socket和客户机的socket地址结构联系起来
if( bind(client_socket,(struct sockaddr*)&client_addr,sizeof(client_addr)))
{
printf("Client Bind Port Failed!\n");
exit(1);
}

//设置一个socket地址结构server_addr,代表服务器的internet地址, 端口
struct sockaddr_in server_addr;
bzero(&server_addr,sizeof(server_addr));
server_addr.sin_family = AF_INET;
if(inet_aton(argv[1],&server_addr.sin_addr) == 0) //服务器的IP地址来自程序的参数
{
printf("Server IP Address Error!\n");
exit(1);
}
server_addr.sin_port = htons(HELLO_WORLD_SERVER_PORT);
socklen_t server_addr_length = sizeof(server_addr);
//向服务器发起连接,连接成功后client_socket代表了客户机和服务器的一个socket连接
if(connect(client_socket,(struct sockaddr*)&server_addr, server_addr_length) < 0)
{
printf("Can Not Connect To %s!\n",argv[1]);
exit(1);
}

char buffer[BUFFER_SIZE];
bzero(buffer,BUFFER_SIZE);
//从服务器接收数据到buffer中
int length = recv(client_socket,buffer,BUFFER_SIZE,0);
if(length < 0)
{
printf("Recieve Data From Server %s Failed!\n", argv[1]);
exit(1);
}
printf("From Server %s: %s",argv[1],buffer);


bzero(buffer,BUFFER_SIZE);
strcpy(buffer,"Client1 connect\n");
//向服务器发送buffer中的数据
send(client_socket,buffer,BUFFER_SIZE,0);

//向服务器发送buffer中的数据

while(1){
printf("send msg to server: \n");
bzero(buffer,BUFFER_SIZE);
//fgets(buffer, 4096, stdin);
scanf("%s",buffer);
if( send(client_socket,buffer,BUFFER_SIZE,0) < 0)
{
printf("send msg error: %s(errno: %d)\n", strerror(errno), errno);
exit(0);
}
//printf("client: %d\n",strcmp(buffer,"exit"));
if(strcmp(buffer,"exit")== 0)
{
printf("client: close the current connect!\n");
printf("------------------------------------------------\n");
break;
}
}
//关闭socket
close(client_socket);
return 0;
}
///////////////////////////////////////////////////////////////////////////////////

文本修改自：http://hi.baidu.com/dlpucat/item/97ab75c5243b8761f6c95d75