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The Misadventures of Quinxy von Besiex truths, lies, and everything in between

20Feb/130

Google+ Hangout C# Control / WPF

The free, multi-party video conferencing offering Google+ Hangout is a pretty fantastic alternative to Skype (and its paid multi-party option).  Wouldn't it be wonderful to have a UI control you could drop into any .NET application that gave you all the power of Google+ Hangout?  Well, it would...  and I've been working on it, but so far it's not proved easy.

First a bit of back story.  I have been working on an app which features embedded video conferencing and had gone initially with Skype.  Skype has been a somewhat miserable experience thus far, workable but only just.  The only way I've been able to integrate with Skype thus far has been their Skype4COM option.  Skype4COM allows you to remote control certain features of Skype from a third-party application.  You can initiate calls, hangup, mute, and things but you can't hide the original Skype interface or embed its video in your own application.  There is a way to do all that, and it's SkypeKit.  But for reasons unknown to me they seem to have suspended SkypeKit access.  I applied to the program many months ago and my account still says something like, "We'll get back to you about SkypeKit when we're ready for you."  I've heard from others that that's just the way it is right now, that they are redoing SkypeKit or something.  At any rate...  Skype isn't a great solution at the moment.  Google+ Hangout on the other hand would be perfect, if only it worked.

I spent a few days a few weeks ago trying to create a Windows control that would let me embed Google+ Hangout inside a Windows control.  The logical approach to do that would be to customize a web browser control to load up the web-based Google+ Hangout and just modify the rendered content and inject JS as necessary to achieve the desired control-ifying of Hangout.  I've done that before, so I didn't think it would prove so tricky.  

Microsoft WebBrowser Control

I first tried using the built-in Microsoft WebBrowser control as the hosting control.  I automated Google account sign-in and had it load up the Google+ Hangout page.  I hit the first major roadblock.  The page gave me a warning about my browser agent not being supported.  I went back and added code to spoof it, but that didn't seem to work as the WebBrowser control isn't all that sophisticated and only spoofs the user agent for the first request, not subsequent ones or ones that the loaded page fetches.  I tried several alternative WebBrowser extension classes that try to intercept navigating requests and replace them with navigate calls that include the spoofing, but they didn't seem to work properly.  If memory serves I did reach a point where I was able to call the JS to start a hangout but everything hung when it tried to install/start the hangout.

Awesomium

The next option I tried was Awesomium, a Chromium-based behind the scenes browser rendering system.  After looking at some of their examples and struggling a bit with their concept (which differed radically from the WebBrowser control and MozNET control approaches I was used to) I ended up realizing I could use one of their demo apps as a quick way to test the concept.  They had a tabbed web browser demo which I used to access Hangout.  I was able to initiate a Hangout but the video of the Hangout was not contained as it should have been within the Awesomium demo browser, the Hangout window was at the top left of the screen whereas the browser was in the middle.  So it worked but if they couldn't control where it was rendering then I didn't think an Awesomium would be an easy solution.

MozNET / Xulrunner

Next I tried my old friend, MozNET.  MozNET is a XULrunner implementation which I've quite enjoyed using before.  There again I wen the easy route first and used a demo browser example to see if I could get it working.  Sadly it did not work.  It would just hang at the step where Hangout is checking for its plugin. I feel like a MozNET solution wouldn't be too hard to achieve, but I don't have the depth of knowledge in it to make it happen easily.  I know MozNET can be made to work with various XPI-based plugins.  

Oddly enough, Google+ Hangout doesn't seem to be an XPI plugin. I did a procmon.exe dump of a Firefox when using Hangout and I see access to: 

C:\Users\foo\AppData\Roaming\Mozilla\Plugins\npgoogletalk.dll

And a separate EXE gets launched:
C:\Users\foo\AppData\Local\Google\Google Talk Plugin\googletalkplugin.exe

But I'm not sure how what is doing the communication between Firefox and the Hangout code.

If anyone has any thoughts they'd like to share, please let me know!  I think the world would benefit from an embeddable Google+ Hangout control...  I know I would.

^ Q

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