Download file (indirect file) : The Official Microsoft ASP.NET Forums

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Download file (indirect file)

Feb 16, 2012 07:52 PM|LINK

Hi

I have a problem with download a file from url.

I would like to download file located for example at: http://stooq.pl/db/d/?d=20120216&t=dh

Like we can seize this is not a direct link/path to file but - as i suppose - file is generated when we click on this link (in web browser "save dialog" has been showen).

In general I'm trying to download files from the table available at the link below:

http://stooq.pl/db/

(any from the table).

To download file with known direct link, like : "www.somethink.com/file1.jpg" I use following code:

public static void File(string uri, string savePath)
        {
            WebClient webClient = new WebClient();
            webClient.DownloadFile(new Uri(uri), savePath);
        }

And it's work fine. But when I try to use WebClient to download file located at the 'indirect' link it is not work.

If you have any idea how to resolve my problem, please let me know.

Regards,

i-spy

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Re: Download file (indirect file)

Feb 18, 2012 06:52 AM|LINK

Have a look at this

http://stackoverflow.com/questions/690587/using-webclient-in-c-sharp-is-there-a-way-to-get-the-url-of-a-site-after-being-r

Prashant

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Re: Download file (indirect file)

Feb 18, 2012 07:04 AM|LINK

If I understood you correctly., then you want to download file from database...in that case please refer following code -

http://www.intstrings.com/ramivemula/asp-net/retrieve-files-from-a-table-in-database-using-generic-handler/

I assume all your files are locatedi ndatabase, then you can have a generic handler to get the file content from database and set its response type and send the response to client, it will give you a save dialog on client browser...

Thanks,

Website
JumpStart

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i-spy

Member

37 Points

20 Posts

Re: Download file (indirect file)

Feb 18, 2012 09:17 AM|LINK

Thank you for yours answers.

The main idea which I would like to perform is:

1. I have a file located on http://stooq.pl/db/d/?d=20120216&t=5

The stooq.pl is not my website - it's external website which share stock exchange quotation files.

2. I would like to download this file into my asp.net application (load this file onto my private server, where my asp.net has been published). Secondly, read this file (it is txt file) and load data into my aspx page.

Point 2 is quite easy, but I have a problem with 1 - with download (or upload - depends on side).

I have tried solution suggested by Prashant Kumar (at http://stackoverflow.com/questions/690587/using-webclient-in-c-sharp-is-there-a-way-to-get-the-url-of-a-site-after-being-r).

At the beginning of the code is:

HttpWebRequest req = (HttpWebRequest)WebRequest.Create("http://stooq.pl/db/d/?d=20120216&t=5");
req.Method = "GET";
req.AllowAutoRedirect = true;
            
WebResponse response = req.GetResponse();

response.GetResponseStream();
Stream responseStream = response.GetResponseStream();

BUT responseStream is empty - no stream.

To explain as easy as possible what exactly I need, I woud like to download, please look at the screenshot below:

this .prn file I would like to download/upload into my application.

Thanks

i-spy

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Dino He - MS...

Star

8068 Points

1023 Posts

Microsoft

Re: Download file (indirect file)

Feb 21, 2012 09:00 AM|LINK

Hi

I write the demo for you.

I can get the file to D:\ called xxx.prn

Hope it helpful.

protected void Page_Load(object sender, EventArgs e)
        {

            try
            {
                WebRequest request = WebRequest.Create("http://stooq.pl/db/d/?d=20120216&t=5");
                WebResponse response = request.GetResponse();
                Stream reader = response.GetResponseStream();

                FileStream writer = new FileStream("D:\\xxx.prn", FileMode.OpenOrCreate, FileAccess.Write);
                byte[] buff = new byte[512];
                int c = 0;
                while ((c = reader.Read(buff, 0, buff.Length)) > 0)
                {
                    writer.Write(buff, 0, c);
                }
                writer.Close();
                writer.Dispose();

                reader.Close();
                reader.Dispose();
                response.Close();

                Response.Write("yes");
            }
            catch (Exception ex)
            {
                Response.Write("No");
            }
        }

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i-spy

Member

37 Points

20 Posts

Re: Download file (indirect file)

Feb 21, 2012 04:15 PM|LINK

Thank you very much for the code above. I have tried it but unfortunately It doesn't work for me - stream is still empty. File

"D:\\xxx.prn" has been created but size of file is equal zero. Loop 'while'

while ((c = reader.Read(buff, 0, buff.Length)) > 0)
{
  writer.Write(buff, 0, c);
}

hasn't saved any data.

I have tried add:

WebRequest request = WebRequest.Create("http://stooq.pl/db/d/?d=20120216&t=5");
request.Method = WebRequestMethods.Http.Get;
request.Headers.Add("Accept-Language", "en-US");

and also:

HttpWebRequest request = WebRequest.Create("http://stooq.pl/db/d/?d=20120216&t=5") as HttpWebRequest;;
request.UserAgent = "Mozilla/5.0 (Windows; U; Windows NT 5.2; en-US; rv:1.7.6)

And It still doesn't work. Do you have any ideas??

Thanks,

i-spy

s

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Dino He - MS...

Star

8068 Points

1023 Posts

Microsoft

Re: Download file (indirect file)

Feb 24, 2012 07:38 AM|LINK

Hi

I think this is because the file in http://stooq.pl/db/d/?d=20120216&t=5 is a empty file.

I download it by browser, and check the file size, 0KB.

I think that the really problem...

Hope it helpful.

Thanks

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AneevJohn

Member

140 Points

52 Posts

Re: Download file (indirect file)

Feb 24, 2012 08:27 AM|LINK

Hi,

Simply Response.REdirect("http://stooq.pl/db/d/?d=20120216&t=dh");

will work.

Cheer,
Aneev John

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i-spy

Member

37 Points

20 Posts

Re: Download file (indirect file)

Feb 24, 2012 03:46 PM|LINK

Hi

It's strange, because when you try to download mentioned file (or another one, for example: http://stooq.pl/db/d/?d=20120224&t=5)

by Internet Explorer browser - the empty file (0kb size) will be downloaded, but using another web bowser e.g. Google Chrome the file size is correct - about 3MB.

I'm confused, because during writing this post I have tried once again to downloading file (by browser) and even when I'm using IE and try to download the oldest file:

http://stooq.pl/db/d/?d=20120216&t=5

it's download correctly.

Unfortunately downloading file by C# code sill doesn't work.

Thanks,

i-spy

Edited by i-spy on Feb 24, 2012 03:48 PM

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Dino He - MS...

Star

8068 Points

1023 Posts

Microsoft

Re: Download file (indirect file)

Feb 27, 2012 10:00 AM|LINK

Hi

Which version you use?

I use or my browser:

Opera firefox chrome IE 8 IE 9

still 0 kb...

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If you have any feedback about my replies, please contact msdnmg@microsoft.com
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