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Back to article list Search Articles Add Comment Printer friendly Direct link Windows API: Handling events from COM in OLE class 2002-11-03 -- Jim Kane Newsgroups: softvelocity.products.c55ee
The type library you sent me indicates the com object generates an event.
Cw does not natively support events used in conjunction with interfaces.
However I wrote an article for cw mag that included my conptcl (connection
point class) that does this in a thread-safe manor.
The iid for the one and only event interface according to ole view is:
IID:Icti32Events group !verify I copied correctly
data1 ulong(0F1a9c677H)
data2 ushort(03c8bH)
data3 ushort(04812H)
data4
string('<0b2H><0dbH><0dcH><02bH><0beH><080H><0acH><0aaH>')
end
to use my class and receive the event, create a window with an acceptloop.
I'll call the window structure eventwindow.
Call my conptcl init method like this in the event:openwindow:
event:oleevent equate(9ABH) !arbitrary
uniqueString equate('cticomobject') !arbitrary
parametercount long
eventid long
parameterarray like(vartype),dim(15)
!set up to connect for events later
if SELF.ConPtCl.init(EventWindow, event:oleevent, thread(), uniquestring)
then
message('Error cant get events.')
post(event:closewindow)
end
!lpinterface is the address of the interface you have been calling
!we use that interfaces queryinterface() method to ask about events
!the connection point interfaces we get back from queryinteface allow us to
register to receive the events.
if SELF.conptcl.connect(SELF.lpInterface, address(IID:Icti32Events)) then
SELF.TakeError('connecting to cti object failed - no events')
post(event:closewindow)
end
in event:closewindow
conptcl.unadvise()
in event:oleevent
loop
if SELF.ConptCl.GetNextEvent(EventId, parametercount,
Address(parameterArray)) then break.
!eventid will always be 1 and parameter count 0. parameterarray is
unused
!display/process the event
yourclass.gotevent()
end
now your class gets called when ever the event fires. I thought It was odd
that they dont pass the the id to tell you which line but for what ever
reason according to ole view they do not. I suspect you should only call
setcallback for one line if you are relying on events.
Jim Kane
ddock"
Today is November 21, 2024, 7:03 am This article has been viewed 35201 times. Google search has resulted in 45 hits on this article since January 25, 2004.
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