[python-win32] IE control via DWebBrowserEvents2

[Mark Hammond]

If this is being used in a control, you probably need one extra "out" param
used by the control window framework in pythonwin.  In my code, I've been
unable to effectively cancel the OnBeforeNavigate2 event though, but I don't
think its related to pywin32.  I could get the OnNewWindow3 event to cancel
though, with code like:

    def OnNewWindow3(self, ppDisp, Cancel, dwFlags, bstrUrlContext,
bstrUrl):
        #print "NewWindow", `bstrUrlContext`, `bstrUrl`
        if i_want_to_cancel_it:
            # cancel the event
            return 0, None, True

That first out param is the extra one I referred to above, and I can't
recall what the 2nd out param is but the 3rd is 'Cancel'

Hope this helps,

Mark


> -----Original Message-----
> From: python-win32-bounces at python.org [mailto:python-win32-
> bounces at python.org] On Behalf Of Vaclav Opekar
> Sent: Sunday, 8 June 2008 9:47 PM
> To: python-win32 at python.org
> Subject: [python-win32] IE control via DWebBrowserEvents2
> 
> Hello all,
> I'm trying to embed IE to a GTK app and control IE behavior via the
> DWebBrowserEvents2 interface.
> Embedding works, events  like OnBeforeNavigate2 or OnNewWindow2 are
> comming  fine but when I try to return (from the callback) a Cancel
> value which suppose stop IE from next page loading or new explorer
> window creation, the program either crashes or doesn't prevent IE from
> moving to next page or opening a new window.
> 
> Any idea how I could approach this problem?
> 
> Bellow are details and code snippets.
> 
> Thanks a lot,
>   Vasek
> 
> ->I've used this example as a base
> http://pywin32.cvs.sourceforge.net/pywin32/pywin32/com/win32comext/axco
> ntrol/demos/container_ie.py?revision=1.2&view=markup
> 
> ->generated the stubs using
> python makepy.py C:\WINDOWS\system32\shdocvw.dll
> 
> ->defined  callback class using the generated classes
> (DWebBrowserEvents2)
> class BrowserCB(DWebBrowserEvents2):
>     def __init__(self, oobj):
>         DWebBrowserEvents2.__init__(self, oobj)
> 
>     #Cancel is in/out param in COM
>     def OnBeforeNavigate2(self, pDisp, URL, Flags, TargetFrameName,
> PostData, Headers, Cancel):
>         if URL != "about:blank" :
>             # return 1 # <- this crashes IE
>             return True # this doesnt work - doesn stop IE to move to
> non blank page
> 
>     # Cancel is in/out param in COM
>     def OnNewWindow2(self, ppDisp=defaultNamedNotOptArg,
> Cancel=defaultNamedNotOptArg):
>         print "OnNewWindow2"
>         return True # returns pythoncom error: Python error invoking
> COM
> method.
> 
> 
> -> callback class registration snippet
>         browser.DoVerb(axcontrol.OLEIVERB_SHOW, None, site, -1,
> self.hwnd, rect)
>         b2 = Dispatch(browser.QueryInterface(pythoncom.IID_IDispatch))
>         self.browser2 = b2
>         self.eventSink = BrowserCB(self.browser2) #only this line was
> added to the above example from CVS
> 
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