C＃IE插件BHO获取pdf

Question

I need help for a little IE Plugin (Browser Helper Object).

If the user clicks on a link with pdf behind, the plugin should call an exe file installed on the computer. The exe file would check the PDF and open the default pdf application or a special one.

My BHO starts with my IE. I used this code for the beginning:
http://www.codeproject.com/Articles/19971/How-to-attach-to-Browser-Helper-Object-BHO-with-C
I disabled all adobe plugins so the ie download window shows up. Whit this code i can parse the html body add html markup etc. but thats not what i'm trying to do...

I don't know how to grab the pdf. If i call directly a pdf download link the cast of the site object into a InternetExplorer or WebBrowser Object fails.

 public int SetSite(object site) { if (site != null) { ieInstance = site as InternetExplorer; ieInstance.DocumentComplete += new DWebBrowserEvents2_DocumentCompleteEventHandler(this.OnDocumentComplete); } else if (ieInstance != null) { ieInstance.DocumentComplete -= new DWebBrowserEvents2_DocumentCompleteEventHandler(this.OnDocumentComplete); } return 0; } 

Document = '((SHDocVw.InternetExplorer)(ieInstance)).Document' threw an exception of type 'System.Runtime.InteropServices.COMException'

Answer 1

What are you trying to achieve more broadly?

You can't grab a HTML document instance when the browser is showing a PDF file because there isn't one-- the PDF object is loaded instead of the HTML-rendering object.

Depending on what you're trying to achieve, there are likely better ways to accomplish it (most likely by registering a MIME Filter for the application/pdf MIME type).