How to keep variables in a level 2 s-function?

2016 5 24
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更新时间：2016 5 25
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I am writing an S-Function that outputs data from an audio device. I need to store the handle to the device but don't know where to keep it. As this is my first level-2 s-function, I'm pretty clueless.
Thanks for any advice

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babazaroni
babazaroni 2016-5-25
One solution is to use the 'persistent' attribute an a variable in a function.

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