Handling CoCreateInstance return value

Question

Here\'s a code sample creating a COM object:

CComPtr pFilter;
auto hr = CoCreateInstance(CLSID_DMOWrapperFilter, NULL,
    CLSCTX_INPROC_S         


        

Answer 1

I think it is redundant and not needed to check both.

If it does fail though, the return value will tell you which error occurred. That's why there's 2 ways of determining if the function succeeded or not.