从网络字节顺序获取文件大小 [英] Getting File size from network byte order

问题描述

以下代码显示了如何将数据包从客户端发送到服务器的

套接字。文件大小（fileSizeTemp）在发送到服务器之前转换为网络字节顺序

。


*（（unsigned short *）& dataBuff [6 + filenameLen + 1]）= htons（（无符号

短）（fileSizeTemp>> 16））;

*（（unsigned short *）& dataBuff [ 6 + filenameLen + 3]）= htons（（无符号

短）（（fileSizeTemp<< 16）>> 16））;


if（send（clientSock，...，...）== SOCKET_ERROR）

{

// ...

}


我的问题是，如何在服务器上获取文件的大小（来自收到的数据包）

？


谢谢


Manu。

解决方案

Manu写道：

下面的代码显示了如何将数据包从客户端发送到服务器的插槽。文件大小（fileSizeTemp）在发送到服务器之前转换为网络字节
顺序。

*（（unsigned short *）& dataBuff [6 + filenameLen + 1]）= htons （（unsigned
short）（fileSizeTemp>> 16））;
*（（unsigned short *）& dataBuff [6 + filenameLen + 3]）= htons（（unsigned
） （）（（fileSizeTemp<< 16）>> 16））;


您可以使用htonl更简单地完成：

*（（unsigned long *）& dataBuff [6 + filenameLen + 1]）=

htonl（fileSizeTemp）

if（send（clientSock，...，...）== SOCKET_ERROR）
//
// ...
}

我的问题是，如何在服务器上获取文件的大小（来自收到的
包）？

ntohl。


Arnaud

MVP - VC

Manu写道：

下面的代码显示了如何将数据包从客户端发送到服务器的插槽。文件大小（fileSizeTemp）在发送到服务器之前转换为网络字节
顺序。

*（（unsigned short *）& dataBuff [6 + filenameLen + 1]）= htons （（unsigned
short）（fileSizeTemp>> 16））;
*（（unsigned short *）& dataBuff [6 + filenameLen + 3]）= htons（（unsigned
） （）（（fileSizeTemp<< 16）>> 16））;


您可以使用htonl更简单地完成：

*（（unsigned long *）& dataBuff [6 + filenameLen + 1]）=

htonl（fileSizeTemp）

if（send（clientSock，...，...）== SOCKET_ERROR）
//
// ...
}

我的问题是，如何在服务器上获取文件的大小（来自收到的
包）？

ntohl。


Arnaud

MVP - VC

但有4个数据的二进制。如何从4个字节的数据中提供netlong参数到ntohl

？


Manu。


< ;广告****** @ club-internet.fr>在消息中写道

news：11 ********************** @ g14g2000cwa.googlegr oups.com ...

Manu写道：

以下代码显示了如何从客户端向服务器发送数据包
插座。在发送到服务器之前，文件大小（fileSizeTemp）被转换为网络字节

命令

。

*（（unsigned short *）& ; dataBuff [6 + filenameLen + 1]）= htons（（unsigned

short）（fileSizeTemp>> 16））;
*（（ unsigned short *）& dataBuff [6 + filenameLen + 3]）= htons（（unsigned

short）（（fileSizeTemp<< 16）>> ; 16））;

你可以用htonl更简单地做到这一点：
*（（unsigned long *）& dataBuff [6 + filenameLen + 1]）=
htonl（fileSizeTemp）

if（send（clientSock，...，...）== SOCKET_ERROR）
{
// ...
}

我的问题是，如何获取文件的大小（来自收到的

包）

在服务器上？

ntohl。

Arnaud
MVP - VC

Hi,

Following code shows how a packet is sent from a client to a server''s
socket. The file size (fileSizeTemp) is converted to network byte order
before sending to the server.

*((unsigned short *)&dataBuff[6 + filenameLen + 1]) = htons((unsigned
short)(fileSizeTemp >> 16));
*((unsigned short *)&dataBuff[6 + filenameLen + 3]) = htons((unsigned
short)((fileSizeTemp << 16) >> 16));

if (send(clientSock, ..., ...) == SOCKET_ERROR)
{
//...
}

My question is, how to get the size of the file (from the received packet)
on the server?

Thanks

Manu.

解决方案

Manu wrote:

Hi,

Following code shows how a packet is sent from a client to a server''s
socket. The file size (fileSizeTemp) is converted to network byte order before sending to the server.

*((unsigned short *)&dataBuff[6 + filenameLen + 1]) = htons((unsigned short)(fileSizeTemp >> 16));
*((unsigned short *)&dataBuff[6 + filenameLen + 3]) = htons((unsigned short)((fileSizeTemp << 16) >> 16));
You could do it more simply with htonl :
*((unsigned long *)&dataBuff[6 + filenameLen + 1]) =
htonl(fileSizeTemp)

if (send(clientSock, ..., ...) == SOCKET_ERROR)
{
//...
}

My question is, how to get the size of the file (from the received packet) on the server?

ntohl.

Arnaud
MVP - VC

Manu wrote:

Hi,

Following code shows how a packet is sent from a client to a server''s
socket. The file size (fileSizeTemp) is converted to network byte order before sending to the server.

*((unsigned short *)&dataBuff[6 + filenameLen + 1]) = htons((unsigned short)(fileSizeTemp >> 16));
*((unsigned short *)&dataBuff[6 + filenameLen + 3]) = htons((unsigned short)((fileSizeTemp << 16) >> 16));
You could do it more simply with htonl :
*((unsigned long *)&dataBuff[6 + filenameLen + 1]) =
htonl(fileSizeTemp)

if (send(clientSock, ..., ...) == SOCKET_ERROR)
{
//...
}

My question is, how to get the size of the file (from the received packet) on the server?

ntohl.

Arnaud
MVP - VC

But there are 4 byes of data. How do I supply the netlong parameter to ntohl
from 4 bytes of data?

Manu.

<ad******@club-internet.fr> wrote in message
news:11**********************@g14g2000cwa.googlegr oups.com...

Manu wrote:

Hi,

Following code shows how a packet is sent from a client to a server''s
socket. The file size (fileSizeTemp) is converted to network byte

order

before sending to the server.

*((unsigned short *)&dataBuff[6 + filenameLen + 1]) = htons((unsigned

short)(fileSizeTemp >> 16));
*((unsigned short *)&dataBuff[6 + filenameLen + 3]) = htons((unsigned

short)((fileSizeTemp << 16) >> 16));

You could do it more simply with htonl :
*((unsigned long *)&dataBuff[6 + filenameLen + 1]) =
htonl(fileSizeTemp)

if (send(clientSock, ..., ...) == SOCKET_ERROR)
{
//...
}

My question is, how to get the size of the file (from the received

packet)

on the server?

ntohl.

Arnaud
MVP - VC

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