COM Interface Pointer - Exercise

1. Assume we have a pointer to interface IF1 in variable pIF1.
2. Interface IF1 has the following IDL definition:

interface IF1 : IUnknown 
{
   HRESULT X1(INT ix);
   HRESULT X2();
}

1. Using interface pointer pIF1, write code to call IF1::X2.
2. Write code to call IF1::QueryInterface to query for interface IF2 using IID_IF2.

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  This exercise is worth 20 points; up to 10 points for each code fragment.
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