How to download a file from an HTTP website? Visual Basic.NET Forums on Bytes. DownloadFile method that you can pass the url to the file you want to download. Downloads the resource with the specified URI to a local file. How to read a URL Content When we want to read content of an HTML page from a remote webserver, in vb.net we are using WebRequest, WebResponse.WebResponse return a StreamReader and we can retrieve the content using a StreamReader.
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I want to know that for make sure that the file that will be download from my script will have the extension I want.
The file will not be at urls like:
Or maybe yes, but, I think that I will only use that kind of URL:
I will not check it with: Url.Substring(Url.LastIndexOf('.') - 3, 3) because this is a very poor way.
So, what do you recommend me to do?
7 Answers
It is weird, but it works:
but as crono remarked bellow, it will not work with parameters:
result: '.jpg?par=x'
If you just want to get the .jpg part of http://example.com/file.jpg then just use Path.GetExtension as heringer suggests.
If the download link is something like http://example.com/this_url_will_download_a_file then the filename will be contained as part of the Content-Disposition, a HTTP header that is used to suggest a filename for browsers that display a 'save file' dialog. If you want to get this filename then you can use the technique suggested by Get filename without Content-Disposition to initiate the download and get the HTTP headers, but cancel the download without actually downloading any of the file
Download A File From Url
I know that this is a old question, but can be helpful to people that see this question.
The best approach for getting extension from file name inside an url, also with parameters are with regex.
You can use this pattern (not urls only):
Explanation:
Example:
So you can use a strong pattern for urls like this:
Explanation:
Example:
Bye
here's a simple one I use. Works with parameters, with absolute and relative URLs, etc. etc.
Unit test if you will
Tune for your own needs
Here is my solution:
First, I verify that my url is a valid url, then I get the file extension from the local path.
Vb.net Download File From Url With Progress
Some have suggested requesting the file from the url and checking the headers. That's overkill for something so simple in my opinion so...
Heringers answer fails if parameters are present on the url, the solution is simple just Split on the query string char ?.
VirtualPathUtility.GetExtension(yourPath);Returns the file extension from the specified path, including the leading period.
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Trying to download file in code.
Current code:
Running this code and checking the response.ResponseUri indicates im being redirected back to the login page and not to the pdf file.
For some reason its not authorising access what could I be missing as Im sending the user name and password in the uri? Thanks for your help
3 Answers
Vb.net Download Xml File From Url
You don't need all of that code to download a file from the netjust use the WebClient class and its DownloadFile method
you should check and see if the site requires cookies (most do), i'd use a packet analyzer and run your code and see exactly what the server is returning. use fiddler or http analyzer to log packets
With UWP, this has become a more pertinent question as UWP does not have a WebClient. The correct answer to this question is if you are being re-directed to the login page, then there must be an issue with your credentials OR the setting (or lack of) header for the HttpWebRequest.
According to Microsoft, the request for downloading is sent with the call to GetResponse() on the HttpWebRequest, therefore the downloaded file SHOULD be in the stream in the response (returned by the GetResponse() call mentioned above).