On Feb 16, 2010, at 2:57 PM, Laurent Daudelin wrote:

> I'm working on a an app that at some point might start transferring a large 
> file to a USB device. Apparently, if the system is set to go to sleep, the 
> transfer will fail.
> 
> I was thinking of using the NSWorkspace extendPowerOffBy: but then the doc 
> says "Currently unimplemented".
> 
> So, if my app get a notification that the system is going to sleep, how can I 
> delay it?
> 

You can call UpdateSystemActivity() periodically (such as on a timer) to 
prevent it from going to sleep.

Neil

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