Downloader

[BC]

Hi all,

Currently I am working on a project that requires download large size
files. I need to write a simple application that can start, pause, and
restart downloads. Similar to applications like GetRight, where you can
pause your download, and restart the download later (i.e. it will start
the download again from the completed percentage).

I am looking for information on how to implement the restart download
section. Any help will be much appreciated.


Cheers,

Benny

 

[Nicholas Paldino [.NET/C# MVP]]

Benny,

One option you have is that you can store the file on a server which is
using the HTTP 1.1 protocol (I believe it is 1.1 and not in 1.0). There is
a header that you can send to the server to indicate which byte to start the
download from. All you have to do is send the byte that you want to start
from, and then append to your file from that point on.

Hope this helps.

 

[BC]

Hi Nicholas,

Thanks for the help.
is using the HTTP 1.1 protocol.

Is this mean the server require to support HTTP 1.1 protocol in order to
allow restart downloads?
byte to start the download from. All you have to do is send the byte
that you want to start
from, and then append to your file from that point on.

Do you have any code examples which I can look at?


Cheers,

Benny

 

[Nicholas Paldino [.NET/C# MVP]]

BC,

Check out the HTTP protocol documentation. Specifically, the byte range
header. Here is a link to that documentation (watch for line wrap):

http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.35.1

You can set the header yourself on an HttpWebRequest instance through
the Headers property on the HttpWebRequest.