Re: #import and CComQIPtr

"Alexander Nickolov" <>
Wed, 12 Dec 2007 09:01:06 -0800
I'm not really sure why did you think calling non-existent
methods through an IDispatch interface should work - they
should simply crash IMHO... What you needed is QI for
__uuidof(MSPPT::_Application) instead of IID_IDispatch.
Then again, if it was failing via the #import wrapper, it'd likely
fail via manual QI as well. You need to figure out why QI is
failing, not come up with alternative ways of calling QI.

Alexander Nickolov
Microsoft MVP [VC], MCSD

<> wrote in message

I am doing PowerPoint automation program,doing like this..

hr = GetActiveObject(clsid, NULL, (IUnknown**)&pUnk);
CComQIPtr<MSPPT::_Application> _pApplicationPtrDummy=pUnk;
it was working properly(till yesterday),but right now suddenly giving
some pApplicationPtrDummy getting only NULL,
gelast error showing 1008("An attempt was made to reference a token
that does not exist")

if i tired like this
pUnk->QueryInterface(IID_IDispatch, (void
**)&_pApplicationPtrDummy );

getting value but it seems to be
incorrect application pointer,because when i call application object
function like getAcivePresenation, giving dialog box
" Run-Time Check Failure #0 - The value of ESP was
not properly saved across a function call. This is usually a result
of calling a function declared with one calling convention with a
function pointer declared with a different calling convention".

kindly give me some guidelines,i replaced the type library file but
no luck

NB: i cannot use wrapper class way because win32 project.

i am really fed up with this error,thanks in advance.

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