CODEWITHSUNDEEP
c#browserdownloadfilenamesdownload-manager
doberman
doberman

Reputation: 51

How can i get a file name from Response.Header ? C#

This is a code, C#.

System.Net.HttpWebRequest _Response =
    (HttpWebRequest)System.Net.WebRequest.Create(e.Uri.AbsoluteUri.ToString());
_Response.Method = "GET";
_Response.Timeout = 120000;
_Response.Accept =
    "application/xml,application/xhtml+xml,text/html;q=0.9,text/plain;q=0.8,image/png,*/*;q=0.5";
_Response.Headers.Add("Accept-Encoding", "gzip,deflate,sdch");
_Response.Headers.Add("Accept-Language", "ru-RU,ru;q=0.8,en-US;q=0.6,en;q=0.4");
_Response.Headers.Add("Accept-Charset", "windows-1251,utf-8;q=0.7,*;q=0.3");
_Response.AllowAutoRedirect = false;

System.Net.HttpWebResponse result = (HttpWebResponse)_Response.GetResponse();

for (int i = 0; i < result.Headers.Count; i++)
{
    MessageBox.Show(result.Headers.ToString());
}

And this is a result,

Cache-Control: private
Content-Type: text/html
Date: Tue, 06 Sep 2011 17:38:26 GMT
ETag: 
Location: http://fs31.filehippo.com/6428/59e79d1f80a74ead98bb04517e26b730/Firefox Setup 7.0b3.exe
Server: Microsoft-IIS/6.0
X-Powered-By: ASP.NET

Upvotes: 1

Views: 15980

Answers (7)

ElektroStudios
ElektroStudios

Reputation: 20464

The easy and efficient way to retrieve filename from Content-Disposition field:

using System.Net.Mime;

HttpWebResponse resp = {YOUR RESPONSE}
string dispHeader = resp.GetResponseHeader("content-disposition");
ContentDisposition disp = new ContentDisposition(dispHeader);
string filename = disp.FileName;

Upvotes: 1

mvcprogrammer
mvcprogrammer

Reputation: 1

If all else fails, you can always parse the WebResponse.ResponseUri.ToString(). Use string.LastIndexOf("/") to find the beginning of the file name and String.IndexOf to see if there is a "?". 

public static void ExtractFileNameFromUri(string URI, ref string parsedFileName, string fileNameStartDelimiter = "/", string fileNameEndDelimiter = "?")
{
    const int NOTFOUND = -1;

    try
    {
        int startParse = URI.LastIndexOf(fileNameStartDelimiter) + fileNameStartDelimiter.Length;

        if (startParse == NOTFOUND)
            return;

        int endParse = URI.IndexOf(fileNameEndDelimiter);

        if (endParse == NOTFOUND)
            endParse = URI.Length;

        parsedFileName = URI.Substring(startParse, (endParse - startParse));
    }
    catch (Exception e)
    {
        Console.WriteLine(e);
        return;
    }
}

Upvotes: 0

J Cracknell
J Cracknell

Reputation: 3547

The correct approach is to see if a filename is provided by the Content-Disposition field and, failing that, to attempt to infer a filename from the Location field.

Be aware than the location field is simply the URL for the download request, and as such may not include an extension or even a meaningful name.

Upvotes: 3

The Lazy Coder
The Lazy Coder

Reputation: 11818

As the file is on a server you will not be able to retrieve the actual filename. Only what the web application is telling you.

This filename is in "Location".

However since the application is telling you that it is text/html it may be formatting the result before it sends it to you. The correct mime type for an executable is application/octet-stream.

On another note. It appears you are downloading the file in which case there is no need to be provided a path. The path of the file you download, is going to be whatever path you place the contents of the downloaded stream into. Therefore you save the file and put it wherever you have access to put it.

When the file is created you have to provide a path, otherwise it is placed in the same directory as the executable that is calling it.

I hope this helps

Upvotes: 0

Seffix
Seffix

Reputation: 1049

Do it like this:

    string fileName = Path.GetFileName(result.Headers["Location"]);

That way, you'll have the file name at the end of the location header.

Upvotes: 2

as-cii
as-cii

Reputation: 13019

If you have got the location of the file you can just extract the header you want (in this case I suppose it is indexed at 4 or at "Location") and then take the last part of the URL.

Upvotes: 1

Reed Copsey
Reed Copsey

Reputation: 564413

Given your headers from your request, you should be able to do:

 string file = result.Headers["Location"];

Upvotes: 1

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