how does latebinding (com) work ?

seb seb at tesco.net
Tue Oct 30 01:08:05 CET 2001


On 29 Oct 2001 13:03:37 GMT, Uwe Schmitt <uwe at rocksport.de> wrote:

>Hi,
>
>can anybody explain, how late-binding of methods of com-objects work
>internally ? What happens if I try to access a method that's not
>implemented at this point of time ? Normally one should get an
>error message....
>
>Greetings, Uwe.
>
>-- 
>Uwe.Schmitt at num.uni-sb.de      Universität des Saarlandes
>phone: +49 (0)681/302-2468     Geb. 36.1, Zi. 4.17, PF 151150
>                               D-66041  Saarbrücken
>http://www.rocksport.de        http://www.rocksport.de/first_ride.mp3
>
As i understand it not really since it's up to the caller. To use late
binding you call IDispatch::GetIDsOfNames and if this doesn't resolve
then there isn't anything to use.

GetIDsOfNames should return DISP_E_UNKNOWNNAME if one or more are
unknown and DISPID_UNKNOWN will be placed in the entry(ies) for which
the dispatch id is unknown, any other entries should be fine. This
makes it very much runtime which is a python-ly thing i suspect.

Platform SDK:Automation on the M$ developer's site should find it.
I've used it and it seems to work, can throw some code at you if you
wish.

seb. (programmer previously known as dawks)
--
sigless.



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