[python-win32] IE control via DWebBrowserEvents2

[Vaclav Opekar]

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/axcontrol/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