[in, out, unique, string, size_is(*pcchErrorDescription)] Returns the description of the error.
pcchErrorDescription
[in, out] Specifies the number of characters in pszErrorDescription. Returns the required number of characters for pszErrorDescription when pcchErrorDescription is too small; otherwise, returns the number of characters written.
HRESULT_FROM_WIN32(ERROR_MORE_DATA) when pszErrorDescription is too small. In this case, the required number of characters is returned in pcchErrorDescription.