Bstr empty null

Email Required, but never shown. The Overflow Blog. Podcast Making Agile work for data science. Stack Gives Back Featured on Meta. New post summary designs on greatest hits now, everywhere else eventually. Related Hot Network Questions. Quote And I guess the answer is Yes. The answer is No. You do not have to do anything special for BSTR. Yes, they handle NULL just fine. Quote Are there some clients that will not be able to access my DLL because the parameters are in the wrong order?

However, since you are returning an [out] value, you should place all. Sorry, I meant [out, retval], not [in, out].

You cannot have a return value marked as [in]. Why [in, out]? Add a comment. Active Oldest Votes. IInspectable NET interops don't obey the rules either - they marshal "" to String.

Empty and NULL to null. Technically they differ. Its up to the implementations whether they handle nulls as empty strings or not. See msdn. Sign up or log in Sign up using Google. Sign up using Facebook. Sign up using Email and Password. Post as a guest Name. A BSTR is a composite data type that consists of a length prefix, a data string, and a terminator.

The following table describes these components. Previously, some versions of Mac operating systems defined this data type in a different way, and some Microsoft code running on Mac computers used this data type.

This documentation no longer describes these obsolete details. A BSTR is a pointer.