CoInitialize/CoUninitialize pair at app level, or at function level?

I've seen example of use of CoInitialize/CoUninitialize pair at app level, where they "bracket" the whole app and are called just once each at start and end of the app.
But I've also seen examples where they are called at the start and end of a single function. This means that they are called more often, presumably.
Which is best?
http://www.ransen.com Cad and Graphics software

On 3/5/2015 9:15 AM, "Owen Ransen" wrote:
Which is best?
Once per thread. If your application is single-threaded, this means once for the whole application.
Igor Tandetnik

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CoInitialize/CoUninitialize pair at app level, or at function level?

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