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Calls an internal function to check the parameters client applications have passed to service providers and MAPI.
Parameters passed between MAPI and service providers are assumed to be correct and undergo only debug validation with the CheckParms macro. Providers should check all parameters passed in by client applications, but clients should assume that MAPI and provider parameters are correct. Use the HR_FAILED macro to test return values.
The UlValidateParms macro is called differently depending on whether the calling code is C or C++. This macro is used to validate parameters for the few IUnknown and MAPI methods that return ULONG instead of HRESULT values; the ValidateParms macro works for all others.