Memory Access problems (possibly)...
deandrsn at uiuc.edu
Tue May 26 00:56:17 UTC 1998
>> >c) You might have forgotten to pass on the pointer to the interface
>> > itself. This is in principle equal to b) since there is just one
>> > parameter wrong which is quite a significant pointer.
>> Unfortunatly, the function I am trying to call is simply AddRef of the
>> IUnknown interface, and thus I am passing no arguments at all. Any other
>That's point c) since COM uses C++ calls which always have the pointer to
>the instance (in your case the interface) as argument. Taken from the
>Win32 SDK "unknwn.h" file the C style declaration looks like:
> ULONG AddRef(IUnknown * This);
Of course. Thanks.
>You should also keep in mind that all COM functions use C++ virtual
>methods meaning that the actual function pointer is obtained by a
>lookup in the interface which is basically an array with all sorts of
>function pointers. Don't even *think* of interpreting the interface you
>obtain as a function address. BTW, I'm really interested how you want to
>interface COM without parsing the entire header files for making sure
>that you're not coding the indices for the functions wrong. I've tried
>this once but given up and decided to stay with a wrapper DLL instead.
I haven't figured that one out yet either. I'll let you know if I come up
with any bright ideas.
Thanks for your help.
More information about the Squeak-dev