COM

Diana Fernandez wrote:

IClass1 pointer is available in COM through type library and object of the class is passed to COM as VARIANT. I have reached till this point and don't know how to proceed. Or is there any other way to implement it?

VARIANT vtPointer; // <--- let's say this is the VARIANT<br />
<br />
if(vtPointer == VT_DISPATCH) // <br />
{<br />
	IDispatch * pDisp = vtPointer.pdispVal; // I asume here that IClass1 is derived from IDispatch<br />
	IClass1 * pClass1 = NULL;<br />
	HRESULT hr = pDisp->QueryInterface(IID_IClass1, (void**)&pClass1);<br />
	if(FAILED(hr))<br />
	{<br />
		// ... manage error<br />
	}<br />
    <br />
	// ... and here you should be able to use pClass1 to call IClass1 methods<br />
	// and then...release the object when you finish<br />
	pClass1->Release();<br />
	// ....<br />
}

Diana Fernandez wrote:

I think the QueryInterface is giving me a new pointer to IClass1

HRESULT CClass1::QueryInterface(REFIID riid, void** ppvObject)<br />
{<br />
if(riid == IID_IUnknown)<br />
  *ppvObject = reinterpret_cast<IUnknown*>(this);<br />
else if(riid == IID_IDispatch)<br />
  *ppvObject = reinterpret_cast<IDispatch*>(this);<br />
else if(riid == IID_IClass1)<br />
  *ppvObject = static_cast<IClass1*>(this);<br />
else<br />
{<br />
  *ppvObject = NULL;<br />
  return E_NOINTERFACE;<br />
}<br />
<br />
  AddRef();<br />
  return S_OK;<br />
}