Type mismatch using QAxBase::dynamiccall

robert_nickel

Hi,

I am using the ActiveQt API to access COM objects. This works great so far. However, I am experiencing problems when SAFEARRAY parameters are involved. Please consider the following function:

@HRESULT GetExistingFacetTolerances (long * ToleranceCount, SAFEARRAY * * ExistingTolerances );@

I have used QAxBase::generateDocumentation() with the following results concerning this function:
@void GetExistingFacetTolerances (int& ToleranceCount, QVariantList*& ExistingTolerances) [slot]@
...
Connect a signal to this slot:

@QObject::connect(sender, SIGNAL(someSignal(int&, QVariantList*&)), object, SLOT(GetExistingFacetTolerances(int&, QVariantList*&)));@
Or call the function directly:
@
QVariantList params = ...
object->dynamicCall("GetExistingFacetTolerances(int&, QVariantList*&)", params);
@

Following the latter approach, my code reads as follows:
@
int tolCount = 0;
QVariantList * tolerances = new QVariantList();
QVariantList params;
params << tolCount << qVariantFromValue((void*)tolerances);
object->dynamicCall("GetExistingFacetTolerances(int&, QVariantList*&)", params);
@

The last line results in an error (output window): "QAxBase: Error calling IDispatch member GetExistingFacetTolerances: Type mismatch in parameter 1"

I have tried many variants passing the second parameter (also including QVariantList&). What is the common way of passing a pointer as a parameter to dynamicCall? I have also tried using signals and slots but this yields exactly the same error message. Unfortunately I cannot debug into the QAxBase code to see what the problem is.

Is SAFEARRAY ** an unsupported type and I have to use the IDispatch interface directly?

Can anyone help?

Regards
Robert