problem with VARIANT - Forums

Home » Forums » Windows » problem with VARIANT

Hello Again
I would like to know how VARIANTS are push into the stack, because I am having some problems with it.
here is a vc++ example declaration



STDMETHOD(get_accChild)(THIS_ VARIANT varChildIndex, IDispatch * FAR* ppdispChild) PURE;

implementation



...

VARIANT varChild;

IDispatch* pDisp = NULL;

accWin->get_accChild(varChild, &pDisp);

I tried to ported to masm this way



lea eax, pDisp

push eax

lea eax, varChild

push eax

mov edx, accWin

push edx

mov edx, [edx]

call [edx].IAccessible.get_accChild

but it does not work..

Are VARIANTs push into the stack in another way ?
I have push the VARIANT address

Thanks

Posted on 2003-09-28 18:36:14 by Jnrz

problem with VARIANT

Your passing the address of the variant.. the definition doesnt show a pointer. You should push the entire variant structure (in reverse order of course ;) ).

Try this



lea eax, pDisp

push eax

lea eax, varChild

push [eax + 12]

push [eax + 8]

push [eax + 4]

push [eax]

mov edx, accWin

push edx

mov edx, [edx]

call [edx].IAccessible.get_accChild

Regards,
:NaN:

Posted on 2003-09-28 22:43:47 by NaN

ASM Community