linux下socket通信，server和client简单例子（二）

2. [代码c代码 client部分     

001client.c

002 

003#include <netinet/in.h>    // for sockaddr_in

004#include <sys/types.h>    // for socket

005#include <sys/socket.h>    // for socket

006#include <stdio.h>        // for printf

007#include <stdlib.h>        // for exit

008#include <string.h>        // for bzero

009/*

010#include <sys/types.h>

011#include <sys/stat.h>

012#include <fcntl.h>

013#include <unistd.h>

014*/

015 

016#define HELLO_WORLD_SERVER_PORT    6666

017#define BUFFER_SIZE 1024

018#define FILE_NAME_MAX_SIZE 512

019 

020int main(int argc, char **argv)

021{

022    if (argc != 2)

023    {

024        printf("Usage: ./%s ServerIPAddress\n",argv[0]);

025        exit(1);

026    }

027 

028    //设置一个socket地址结构client_addr,代表客户机internet地址, 端口

029    struct sockaddr_in client_addr;

030    bzero(&client_addr,sizeof(client_addr)); //把一段内存区的内容全部设置为0

031    client_addr.sin_family = AF_INET;    //internet协议族

032    client_addr.sin_addr.s_addr = htons(INADDR_ANY);//INADDR_ANY表示自动获取本机地址

033    client_addr.sin_port = htons(0);    //0表示让系统自动分配一个空闲端口

034    //创建用于internet的流协议(TCP)socket,用client_socket代表客户机socket

035    int client_socket = socket(AF_INET,SOCK_STREAM,0);

036    if( client_socket < 0)

037    {

038        printf("Create Socket Failed!\n");

039        exit(1);

040    }

041    //把客户机的socket和客户机的socket地址结构联系起来

042    if( bind(client_socket,(struct sockaddr*)&client_addr,sizeof(client_addr)))

043    {

044        printf("Client Bind Port Failed!\n");

045        exit(1);

046    }

047 

048    //设置一个socket地址结构server_addr,代表服务器的internet地址, 端口

049    struct sockaddr_in server_addr;

050    bzero(&server_addr,sizeof(server_addr));

051    server_addr.sin_family = AF_INET;

052    if(inet_aton(argv[1],&server_addr.sin_addr) == 0) //服务器的IP地址来自程序的参数

053    {

054        printf("Server IP Address Error!\n");

055        exit(1);

056    }

057    server_addr.sin_port = htons(HELLO_WORLD_SERVER_PORT);

058    socklen_t server_addr_length = sizeof(server_addr);

059    //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

060    if(connect(client_socket,(struct sockaddr*)&server_addr, server_addr_length) < 0)

061    {

062        printf("Can Not Connect To %s!\n",argv[1]);

063        exit(1);

064    }

065 

066    char file_name[FILE_NAME_MAX_SIZE+1];

067    bzero(file_name, FILE_NAME_MAX_SIZE+1);

068    printf("Please Input File Name On Server:\t");

069    scanf("%s", file_name);

070     

071    char buffer[BUFFER_SIZE];

072    bzero(buffer,BUFFER_SIZE);

073    strncpy(buffer, file_name, strlen(file_name)>BUFFER_SIZE?BUFFER_SIZE:strlen(file_name));

074    //向服务器发送buffer中的数据

075    send(client_socket,buffer,BUFFER_SIZE,0);

076 

077//    int fp = open(file_name, O_WRONLY|O_CREAT);

078//    if( fp < 0 )

079    FILE * fp = fopen(file_name,"w");

080    if(NULL == fp )

081    {

082        printf("File:\t%s Can Not Open To Write\n", file_name);

083        exit(1);

084    }

085     

086    //从服务器接收数据到buffer中

087    bzero(buffer,BUFFER_SIZE);

088    int length = 0;

089    while( length = recv(client_socket,buffer,BUFFER_SIZE,0))

090    {

091        if(length < 0)

092        {

093            printf("Recieve Data From Server %s Failed!\n", argv[1]);

094            break;

095        }

096//        int write_length = write(fp, buffer,length);

097        int write_length = fwrite(buffer,sizeof(char),length,fp);

098        if (write_length<length)

099        {

100            printf("File:\t%s Write Failed\n", file_name);

101            break;

102        }

103        bzero(buffer,BUFFER_SIZE);   

104    }

105    printf("Recieve File:\t %s From Server[%s] Finished\n",file_name, argv[1]);

106     

107    close(fp);

108    //关闭socket

109    close(client_socket);

110    return 0;

111}