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How to monitor a variable change like event?

Hi  all
 
I have a VC dll which include a event on COM port to download firmware to production. There are many status during the download process. And all the status are modifed by event methods, that means I can not decide when it happens, just decided by when the event occur. But I can not access the event in TestStand so I add some methods in the dll source code such as GetStatus() to export the status to TestStand, but this method is not event driven, I need to invoke it if I want the status, so I put it in a sequence loop to monitor it all the time, I doubt that if it can capture all the status changes?
And if anyone has another good solution for this case?
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*The best Chinese farmer*
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Is it too difficult to do?
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*The best Chinese farmer*
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