From: Luke Cowell <lcowell@...>
Date: 2009-04-16T23:58:08+09:00
Subject: Re: how to know if completely downloaded

> 
> "raise an error if the download does not complete"
>  question: Where i will put my raise error in my code?... i put a "begin 
> - rescue - else - end" in my code... hardest part is ".read" has no 
> error exemption to check if it reads all throughout the file.
> 

I'm talking about adding an exception into the code that does the 
downloading, not the code that reads off the disk. If you can detect 
that a download has ended unexpectedly, you can queue the download to 
start again.

> "check the files against the server you are downloading from."
>  question: how do i check the files against the server?
> 

By md5 checksum or the file size.

> "md5 checksum"
>  question: what is md5 checksum?
> 

Do some googling my friend.

> "check the size"
>  comment: after i made this thread, i added my code to check the size. 
> Before i download the file i check the size using "uri meta .length" and 
> compare it after i download it using "File.size"... but still no use 
> because if it break at ".read" the size that i will get is still same as 
> what i downloaded... meaning uri.length = File.size
> 

If you know the length the content is supposed to be doing something 
like this:

Net::HTTP.start("www.example.com", 80) {|res| h = res.head("/"); puts 
h.to_yaml }

You can check that against the size of the downloaded file.

I think I might be able to help you more if you posted your download 
code.

> thank ahead...

No problem.

Luke


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