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flaviob64436168
Participant
February 4, 2016
Question

vbnet webbrowser and embedded pdf

  • February 4, 2016
  • 1 reply
  • 2433 views

Good morning, I've developed a vb.net application that uses a webbrowser to display pdf, the file displays in the right way but I need to download the pdf to local pc reading the data from the webbrowser object. Inside the page I'seen that the pdf is an embed object, how can I read the data from this object?

This is the object inside the page, I need to download the 6987306.pdf file

<embed id="plugin" type="application/x-google-chrome-pdf" src="https://www.xxx.it/_iq3/carica_pdf.php" stream-url="blob:chrome-extension://mhjfbmdgcfjbbpaeojofohoefgiehjai/75707604-396B-48CE-8736-1FECC6CCD52E" headers="Cache-Control: max-age=0

Connection: close

Content-Disposition: inline; filename=6987306.pdf

Content-Length: 78468

Content-Type: application/pdf

Date: Wed, 03 Feb 2016 17:51:25 GMT

Expires: Thu, 19 Nov 1981 08:52:00 GMT

P3P: policyref=&quot;/w3c/p3p.xml&quot;, CP=&quot;NOI DSP COR NID CUR ADM DEV OUR BUS&quot;

Pragma: Public

Server: Apache

Set-Cookie: lpitgu=10db98ad4808b2091be97560b6877d2f; expires=Sun, 07-Feb-2016 17:51:25 GMT; path=/

" background-color="0xFF525659" top-toolbar-height="56" full-frame="">

Thanks

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    1 reply

    sinious
    sinious
    Legend
    February 4, 2016

    Hi,

    I don't use asp or vbnet but I've had some past experience with aspx c#.net. I was very used to running around looking for libraries that would help me do anything the .net framework didn't already do. This is common to all languages as I'd do the same in ActionScript or JavaScript as well. There are many libraries out there that are designed to help deconstruct the PDF format. Have you looked for any yet?

    How you're doing it now is assuming the object you're embedding has an API that reaches back to VB.net. From the header, you're using the built-in Chrome PDF reader, which to my knowledge has no real API. You can do things like select a page by appending that to the request but as far as reaching into the PDF I haven't found any API from Google to do that. And you can't depend on your audience having Chrome even if you did find one as many may have Adobe Reader.

    I think your best bet, in any language, is to find a library (free or not) that deconstructs PDFs so you can access the parts you want. I did a quick search and found things like RADPDF(.com) but there's so many things out there and I don't know VB.NET enough to suggest anything. You really need to take a look at them. Good luck!

    F
    flaviob64436168Author
    Participant
    February 5, 2016

    Hi, thanks for your answer, I' use iTextSharp to manage with pdf, but in this page I'm not able to extract the pdf from the embed.

    I'm trying to disable the chrome plugin to see what happens to the embedded object and maybe find an api or write a js to extract the data.

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