How can I use set_param to set StartFcn from within a class method?

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Matthew Drummond-Stoyles
评论： Matthew Drummond-Stoyles 2020-5-13
I am trying to use
set_param(app.Model,'StartFcn','app.registerListeners')
but the code when run inside StartFcn doesn't recognize 'app' or 'registerListeners'. 'app' is a parameter of the method this is called from, and 'registerListeners' is a public method in the same class.
I have tried:
  • Using a callback instead of putting the third argument in single quotes - says 'Invalid setting for block diagram parameter 'StartFcn'

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回答（1 个）

Sai Sri Pathuri
Sai Sri Pathuri 2020-5-7
Can you add the error being thrown when you use 'app.registerListeners(app)' as the third parameter?
If this is the error,
The class app has no Constant property or Static method named 'registerListeners'.
you may try to convert registerListeners function to static to use it as a start function. Also, try to check if app and model are in same folder or add the folder containing app to the MATLAB path.
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Tommy
Tommy 2020-5-11
While possibly not the best solution, is the following an option?
assignin('base', 'app', app);
set_param(app.Model, 'StartFcn', 'app.registerListeners');
Matthew Drummond-Stoyles
Matthew Drummond-Stoyles 2020-5-13
Yes but that is basically the same as what I am currently doing (using a global variable). It works but everything I've read says global variables are never the answer if you want to write clean code. It's surprising that this hasn't been asked before, since I am only at the stage of trying to link the user interface to my Simulink model.

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