c++ - How to prevent crashing if com dll isnt registered -

With some older C ++ code trying to use Com DL, it works fine when DLL is registered Goes, but it crahses if DLL is not registered.

// COM start HRESULT hr = CoInitialize (NULL);

IGetTestPtr ptest (__ uuidof (tester));

"Use method from dll"

// Uninstall COM CoUninitialize ();

Before calling on IGetTestPtr ptest (__ uuidof (tester)) to check whether DLL is registered?

Or what is the right way to stop the accident?

Your object can be successfully tested for HRESULT returning:

 < Code> IGetTestPtr p = null; HRESULT hRes = P. Create Instance (__Widoff (Tester)); Bool BSUVP = SUCCEEDED (HRS);  

It assumes that you have created the interface wrapper around your Type Library using Visual Studio, where COM Smart Pointers are used in the interface (this gives you the CreateInstance method).