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Asked: 2026-05-11T00:03:10+00:00

Both: CLSID IID Having specified the above, and using: CoCreateInstance() To returning a single

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Both:

  • CLSID
  • IID

Having specified the above, and using:

  • CoCreateInstance()

To returning a single uninitialised object of the class specified by the CLSID above.

How can I then access an Interface’s method from C++? Without:

  • ATL
  • MFC
  • Just plain C++

Afterwards, I use CreateInstance()

I’m having trouble, using CreateInstance() – with the last parameter – ppv

Using oleview, I can see methods of the specified IIDabove IID above, such as:

interface IS8Simulation : IDispatch {     HRESULT Open([in] BSTR FileName); };

How can I then access the above? Examples/guidance – please

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1 Answer

  1. By doing a CoCreateInstance you get an interface pointer. Through QueryInterface(…) method you can get the interface pointer of some other interface easily. e.g., 

      IUnknown* pUnk = NULL; HRESULT hr = ::CoCreateInstance(clsid,NULL,CLSCTX_ALL,__uuidof(IUnknown),(void**)&pUnk);

    IS8Simulation* pSim = NULL; hr = pUnk->QueryInterface(__uuidof(IS8Simulation), (void**)&pSim);

    After doing this, you will get the pointer to IS8Simulation in pSim and through that you can call methods of that interface. Remember you need to provide a valid clsid in the CoCreateInstance call.

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