How I change a block mask programmatically using a Level 2 Matlab S function?

MC
2020 9 30
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更新时间：2020 10 1
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I would like to change items in a block mask for a Level 2 Matlab S function using the S function.
For example, I have an S function that reads a file and sets the number of outports based on the data in that file. I have a mask on that S function block. How do I configure the port labels of the mask using the S function. Using callbacks in the mask would be acceptable.
I have tried set_param(gcb, 'MaskDisplay', display_code) in the setup function of the S function code but ended up in an unrecoverable recursion situation.
I was going to try to use a callback in the mask itself but have not found a good way to get the data from the S function to the callback.

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MC
MC 2020-10-1

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I figured it out. I used "Simulink.Mask..." to set the property of the mask in the S function setup which doesn't seem to trigger the S function to run like set_param does.
mask_object = Simulink.Mask.get(gcb);
display_script = mask_object.Display;
Do some stuff to the value of display_script
mask_object.Display = display_script;

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MC
MC
2020-9-30

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MC
2020-10-1

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