linux 下用socket 文件传输问题(UDP)

2025-02-27 03:28:53
推荐回答(3个)
回答1:

要下班了,时间急,不写代码了先给你一个思路
1 实现最简单的udp socket 模型,实现发送一个字符串。
2 实现一个简单的打开文件,读取文件的例子,如用fgets(),类似的函数有很多,然后再把读取的文件内容忘另一个文件里写(相关函数fopen(),write(),read())。
3 把上面两个函数结合到一起,在客户端实现打开要传送的文件,按一定的大小读取,读取后调用sendto()发送到服务器端。在服务器端创建一个文件,然后调用recvfrom()接受客户端发送过来的数据,向来是创建的那个文件中写。
下面是改好的udp发送文件的例子。

服务器端程序的编译
gcc -o file_server  file_server
客户端程序的编译
gcc -o file_client  file_client.c
服务器程序和客户端程应当分别运行在2台计算机上.
服务器端程序的运行,在一个计算机的终端执行
./file_server
客户端程序的运行,在另一个计算机的终端中执行
./file_client  运行服务器程序的计算机的IP地址
根据提示输入要传输的服务器上的文件,该文件在服务器的运行目录上
在实际编程和测试中,可以用2个终端代替2个计算机,这样就可以在一台计算机上测试网络程序,
服务器端程序的运行,在一个终端执行
./file_server
客户端程序的运行,在另一个终端中执行
./file_client  127.0.0.1
说明: 任何计算机都可以通过127.0.0.1访问自己. 也可以用计算机的实际IP地址代替127.0.0.1
//////////////////////////////////////////////////////////////////////////////////////
// file_server.c  文件传输顺序服务器示例
//////////////////////////////////////////////////////////////////////////////////////
//本文件是服务器的代码
#include     // for sockaddr_in
#include     // for socket
#include     // for socket
#include         // for printf
#include         // for exit
#include         // for bzero
/*
#include
#include
#include
#include
*/
#define HELLO_WORLD_SERVER_PORT    6666
#define LENGTH_OF_LISTEN_QUEUE  20
#define BUFFER_SIZE 1024
#define FILE_NAME_MAX_SIZE 512

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, pcliaddr;
    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);

    //创建用于internet的据报套接字(UDPt,用server_socket代表服务器socket

// 创建数据报套接字(UDP)
    int server_socket = socket(PF_INET,SOCK_DGRAM,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);
    }
   
    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 n = sizeof(client_addr) ;
int length;

        char buffer[BUFFER_SIZE];
        bzero(buffer, BUFFER_SIZE);
        length = recvfrom(new_server_socket,buffer,BUFFER_SIZE,0,&pcliaddr,&n);
        if (length < 0)
        {
            printf("Server Recieve Data Failed!\n");
            break;
        }
        char file_name[FILE_NAME_MAX_SIZE+1];
        bzero(file_name, FILE_NAME_MAX_SIZE+1);
        strncpy(file_name, buffer, strlen(buffer)>FILE_NAME_MAX_SIZE?FILE_NAME_MAX_SIZE:strlen(buffer));
//        int fp = open(file_name, O_RDONLY);
//        if( fp < 0 )
        FILE * fp = fopen(file_name,"r");
        if(NULL == fp )
        {
            printf("File:\t%s Not Found\n", file_name);
        }
        else
        {
            bzero(buffer, BUFFER_SIZE);
            int file_block_length = 0;
//            while( (file_block_length = read(fp,buffer,BUFFER_SIZE))>0)
            while( (file_block_length = fread(buffer,sizeof(char),BUFFER_SIZE,fp))>0)
            {
                printf("file_block_length = %d\n",file_block_length);
                //发送buffer中的字符串到new_server_socket,实际是给客户端
                if(send(new_server_socket,buffer,file_block_length,0)<0)
                {
                    printf("Send File:\t%s Failed\n", file_name);
                    break;
                }
                bzero(buffer, BUFFER_SIZE);
            }
//            close(fp);
            fclose(fp);
            printf("File:\t%s Transfer Finished\n",file_name);
        }
    }
}

//////////////////////////////////////////////////////////////////////////////////////
// file_client.c  文件传输客户端程序示例
//////////////////////////////////////////////////////////////////////////////////////
//本文件是客户机的代码
#include     // for sockaddr_in
#include     // for socket
#include     // for socket
#include         // for printf
#include         // for exit
#include         // for bzero
/*
#include
#include
#include
#include
*/

#define HELLO_WORLD_SERVER_PORT    6666
#define BUFFER_SIZE 1024
#define FILE_NAME_MAX_SIZE 512

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_DGRAM,0);
    if( client_socket < 0)
    {
        printf("Create Socket 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);

    char file_name[FILE_NAME_MAX_SIZE+1];
    bzero(file_name, FILE_NAME_MAX_SIZE+1);
    printf("Please Input File Name On Server:\t");
    scanf("%s", file_name);
   
    char buffer[BUFFER_SIZE];
    bzero(buffer,BUFFER_SIZE);
    strncpy(buffer, file_name, strlen(file_name)>BUFFER_SIZE?BUFFER_SIZE:strlen(file_name));
    //向服务器发送buffer中的数据
     socklen_t n = sizeof(server_addr) ;
    sendto(client_socket,buffer,BUFFER_SIZE,0,(struct sockaddr*)&server_addr,n);

//    int fp = open(file_name, O_WRONLY|O_CREAT);
//    if( fp < 0 )
    FILE * fp = fopen(file_name,"w");
    if(NULL == fp )
    {
        printf("File:\t%s Can Not Open To Write\n", file_name);
        exit(1);
    }
   
    //从服务器接收数据到buffer中
    bzero(buffer,BUFFER_SIZE);
    int length = 0;
    while( length = recv(client_socket,buffer,BUFFER_SIZE,0))
    {
        if(length < 0)
        {
            printf("Recieve Data From Server %s Failed!\n", argv[1]);
            break;
        }
//        int write_length = write(fp, buffer,length);
        int write_length = fwrite(buffer,sizeof(char),length,fp);
        if (write_length        {
            printf("File:\t%s Write Failed\n", file_name);
            break;
        }
        bzero(buffer,BUFFER_SIZE);   
    }
    printf("Recieve File:\t %s From Server[%s] Finished\n",file_name, argv[1]);
    return 0;
}

回答2:

服务器端程序的编译
gcc -o file_server file_server
客户端程序的编译
gcc -o file_client file_client.c
服务器程序和客户端程应当分别运行在2台计算机上.
服务器端程序的运行,在一个计算机的终端执行
./file_server
客户端程序的运行,在另一个计算机的终端中执行
./file_client 运行服务器程序的计算机的IP地址
根据提示输入要传输的服务器上的文件,该文件在服务器的运行目录上
在实际编程和测试中,可以用2个终端代替2个计算机,这样就可以在一台计算机上测试网络程序,
服务器端程序的运行,在一个终端执行
./file_server
客户端程序的运行,在另一个终端中执行
./file_client 127.0.0.1
说明: 任何计算机都可以通过127.0.0.1访问自己. 也可以用计算机的实际IP地址代替127.0.0.1
//////////////////////////////////////////////////////////////////////////////////////
// file_server.c 文件传输顺序服务器示例
//////////////////////////////////////////////////////////////////////////////////////
//本文件是服务器的代码
#include // for sockaddr_in
#include // for socket
#include // for socket
#include // for printf
#include // for exit
#include // for bzero
/*
#include
#include
#include
#include
*/
#define HELLO_WORLD_SERVER_PORT 6666
#define LENGTH_OF_LISTEN_QUEUE 20
#define BUFFER_SIZE 1024
#define FILE_NAME_MAX_SIZE 512

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);

//创建用于internet的流协议(TCP)socket,用server_socket代表服务器socket
int server_socket = socket(PF_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;
}

char buffer[BUFFER_SIZE];
bzero(buffer, BUFFER_SIZE);
length = recv(new_server_socket,buffer,BUFFER_SIZE,0);
if (length < 0)
{
printf("Server Recieve Data Failed!\n");
break;
}
char file_name[FILE_NAME_MAX_SIZE+1];
bzero(file_name, FILE_NAME_MAX_SIZE+1);
strncpy(file_name, buffer, strlen(buffer)>FILE_NAME_MAX_SIZE?FILE_NAME_MAX_SIZE:strlen(buffer));
// int fp = open(file_name, O_RDONLY);
// if( fp < 0 )
FILE * fp = fopen(file_name,"r");
if(NULL == fp )
{
printf("File:\t%s Not Found\n", file_name);
}
else
{
bzero(buffer, BUFFER_SIZE);
int file_block_length = 0;
// while( (file_block_length = read(fp,buffer,BUFFER_SIZE))>0)
while( (file_block_length = fread(buffer,sizeof(char),BUFFER_SIZE,fp))>0)
{
printf("file_block_length = %d\n",file_block_length);
//发送buffer中的字符串到new_server_socket,实际是给客户端
if(send(new_server_socket,buffer,file_block_length,0)<0)
{
printf("Send File:\t%s Failed\n", file_name);
break;
}
bzero(buffer, BUFFER_SIZE);
}
// close(fp);
fclose(fp);
printf("File:\t%s Transfer Finished\n",file_name);
}
//关闭与客户端的连接
close(new_server_socket);
}
//关闭监听用的socket
close(server_socket);
return 0;
}

//////////////////////////////////////////////////////////////////////////////////////
// file_client.c 文件传输客户端程序示例
//////////////////////////////////////////////////////////////////////////////////////
//本文件是客户机的代码
#include // for sockaddr_in
#include // for socket
#include // for socket
#include // for printf
#include // for exit
#include // for bzero
/*
#include
#include
#include
#include
*/

#define HELLO_WORLD_SERVER_PORT 6666
#define BUFFER_SIZE 1024
#define FILE_NAME_MAX_SIZE 512

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 file_name[FILE_NAME_MAX_SIZE+1];
bzero(file_name, FILE_NAME_MAX_SIZE+1);
printf("Please Input File Name On Server:\t");
scanf("%s", file_name);

char buffer[BUFFER_SIZE];
bzero(buffer,BUFFER_SIZE);
strncpy(buffer, file_name, strlen(file_name)>BUFFER_SIZE?BUFFER_SIZE:strlen(file_name));
//向服务器发送buffer中的数据
send(client_socket,buffer,BUFFER_SIZE,0);

// int fp = open(file_name, O_WRONLY|O_CREAT);
// if( fp < 0 )
FILE * fp = fopen(file_name,"w");
if(NULL == fp )
{
printf("File:\t%s Can Not Open To Write\n", file_name);
exit(1);
}

//从服务器接收数据到buffer中
bzero(buffer,BUFFER_SIZE);
int length = 0;
while( length = recv(client_socket,buffer,BUFFER_SIZE,0))
{
if(length < 0)
{
printf("Recieve Data From Server %s Failed!\n", argv[1]);
break;
}
// int write_length = write(fp, buffer,length);
int write_length = fwrite(buffer,sizeof(char),length,fp);
if (write_length {
printf("File:\t%s Write Failed\n", file_name);
break;
}
bzero(buffer,BUFFER_SIZE);
}
printf("Recieve File:\t %s From Server[%s] Finished\n",file_name, argv[1]);

close(fp);
//关闭socket
close(client_socket);
return 0;
}

回答3:

你传输文本的时候用的什么函数阿?send/recv?还是sendto/recvfrom?或者直接read/write?
文件不是一样的?只不过需要自己拟定一个协议,比如先发送文件大小,然后把文件打开了往里放不就好了,没有难度吧

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