[app designer] Create callback function when a variable changed.

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Jae-Hee Park 2021-12-15

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https://ww2.mathworks.cn/matlabcentral/answers/1611230-app-designer-create-callback-function-when-a-variable-changed

回答： Jae-Hee Park 2021-12-21

采纳的回答： Jae-Hee Park

Hello I am here to find help

I want to make a simple app which containing a Lamp in app designer.

That Lamp turns green when this app connected with other app by TCP/IP.

And when TCP/IP connection is disconnected, the Lamp turns to be red.

I think it is possible by some kind of callback function called when TCP/IP connection check value is changed.

How can I make it?

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Geoff Hayes 2021-12-20

@Jae-Hee Park - you might be able to use the ErrorOccurredFcn callback to capture if there is an error and from that you might be able to assume that the connection is lost. I couldn't see a function that might check the state of the connection. There might be one, but it wasn't obvious to me.

Jae-Hee Park 2021-12-21