webbrowser in web service problem

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2.00/5 (3 votes)

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Hi.
My goal is writing the web service method that print from a html string.I did it using a System.Windows.Forms.WebBrowser class.

C#

const short PRINT_WAITFORCOMPLETION = 2;
  const int OLECMDID_PRINT = 6;
  const int OLECMDEXECOPT_DONTPROMPTUSER = 2;
  var browser = new WebBrowser();
  browser = Browser;
  while (browser.ReadyState != WebBrowserReadyState.Complete)
  Application.DoEvents();
  dynamic ie = browser.ActiveXInstance;
  HtmlDocument htmld = (HtmlDocument)browser.Document;
  htmld .Body.InnerHtml = HtmlString;
  ie.ExecWB(OLECMDID_PRINT, OLECMDEXECOPT_DONTPROMPTUSER, PRINT_WAITFORCOMPLETION);

I get the following error:

"TargetInvocation exception" and "Unable to get window handle for WebBrowser Control. Windowless ActiveX control not Supported"

Please Help how to resolve it.

Posted 7-Dec-11 23:41pm

saman.h

Updated 8-Dec-11 21:47pm

v3

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Comments

Sergey Alexandrovich Kryukov 8-Dec-11 16:14pm

Which WebBrowser class? There are more than one. Fully qualified name, please, with name space. Tag the UI library, please.
--SA

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Sergey Alexandrovich Kryukov · Answer 1 · 2011-12-08T10:20:00

This is exactly what it is. This class can be only used is hosted by some UI class. I don't know, Forms, WPF — you did not specify what WebBrowser class you tried to use — please see my question. However, it does not matter, because…

Using any UI controls in a Web Service is absolutely pointless. Even if it was possible, who would see the UI?! :-)

Even if your Web Service really needs to act as a Web client, which is fine, you can use System.Net.HttpWebRequest, see:
http://msdn.microsoft.com/en-us/library/system.net.httpwebrequest.aspx[^],
http://msdn.microsoft.com/en-us/library/system.net.webrequest.aspx[^] (see the code sample here).

—SA