COM and IDispatch

I have the following code:

Code:

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// Get all of the children components from this m_Component object
_variant_t componentChildren = pComponent->GetChildren();

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The returned variant contains a SafeArray of IDispatch pointers. I have verified that the count of the SafeArray is correct, but the IDispatch pointers are all NULL.

I extract the array elements like below:

Code:

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if ((componentChildren.vt == VT_EMPTY) || (V_VT(&componentChildren) == VT_NULL)) // Error - array is empty or null
        return 0;     

SAFEARRAY* psa = V_ARRAY(&componentChildren);
HRESULT hres = SafeArrayAccessData(psa, (void **)pChildren);
long highIndex;

SafeArrayGetUBound(psa, 1, &highIndex); // Get index number of highest array element

// The array range is from 0 to highIndex

long childrenCount = highIndex + 1;  // Actual # of array elements is highIndex + 1

if(pChildren)
{
        // Recursively traverse the children
        for (int i = 0; i < childrenCount; i++) // For each child component
        {
                TraverseChildren(RecurseLevel, pChildren[i]);
        }
}

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The pChildren[i] causes an access violation error.

What could be the probable reasons for this. Please help I am stuck in this.

You should use an extra level of indirection:

Code:

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HRESULT hres = SafeArrayAccessData(psa, (void **) & pChildren);

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