searching around on the internet for code snippets to do event handling on MSHTML, e.g. HTMLElement insertEvent, i find ... nothing! everybody has been struggling literally since about 2000 when the idea of combining python and MSHTML first really took off.
i just wanted to let people know, for those doing google searches - i did it! i _actually_ managed to come up with the right voodoo magic incantations where you can pass in a python callback function into HTMLElement insertEvent. the key was combining ctypes pointer to a comtypes.automation.VARIANT with a python COM object with an IDispatch interface on it, which is what you're _supposed_ to do, but it's tricky as hell to work out. what i had to do was take a _much_ older version of comtypes.client._events.py and hack it into submission: http://pyjamas.svn.sourceforge.net/viewvc/pyjamas/trunk/pyjd/mshtmlevents.py there are two styles that you can use: def addEventListener(self, node, event_name, event_fn): rcvr = mshtmlevents.GetDispEventReceiver(MSHTML.HTMLElementEvents2, event_fn, "on%s" % event_name) rcvr.sender = node ifc = rcvr.QueryInterface(IDispatch) node.attachEvent("on%s" % event_name, ifc) return ifc def _addWindowEventListener(self, event_name, event_fn): print "_addWindowEventListener", event_name, event_fn #rcvr = mshtmlevents.GetDispEventReceiver(MSHTML.HTMLWindowEvents, # event_fn, "on%s" % event_name) #print rcvr #rcvr.sender = self.getGdomWindow() #print rcvr.sender #ifc = rcvr.QueryInterface(IDispatch) #print ifc #v = VARIANT(ifc) #print v #setattr(self.getGdomWindow(), "on%s" % event_name, v) #return ifc self.getGdomWindow just returns the parentWindow object. but... this second style, when the COM object created by GetDispEventReceiver's IDispatch_Invoke function is called, you _do not_ receive the actual IHTMLEventObj back! so - don't use that style :) it works, but it's useless. i wasted 3 hours last night finding that out. but - i'm including it here simply for completeness. use the first style, instead: attachEvent. then you end up with the MSHTML event handling system doing an Invoke on you whilst also passing the IHTMLEventObj to you in the arguments - hooray! so you can get event.type, event.target etc. etc. btw please don't be confused by me attempting to do event handling on window, in the commented-out code, i'm still struggling to get window event handling working, but HTMLElement it actually works. one thing that's important to note is that the MSHTML event dispatch system will only pass 0 as the method number, NOT i repeat NOT a whole range of numbers representing different event types. the hacked-together code in mshtmlevents.py looks very similar to GetEvents, which was designed to get multiple events and to cope with multiple callbacks onto one COM object - but this is _completely_ different. attachEvent expects a COM Object with an _exclusive_ purpose in mind. l. _______________________________________________ python-win32 mailing list python-win32@python.org http://mail.python.org/mailman/listinfo/python-win32
