How to call a script BEFORE opening a Simulink subsystem?

When the user double clicks a Simulink subsystem, I would like to call a MATLAB .m script (to check if the block is a disabled library link, and issue a warning if the associated model file is not "locked" in the version control system), and then open the subsystem normally.

• By using the OpenFcn callback, I can only call the script INSTEAD of opening the subsystem.
• When I write an OpenFcn callback that calls the script and then calls open_system to open the subsystem, I get an error message which says I must not call OpenFcn recursively.

I'm using MATLAB version 2012b.

Any ideas would be appreciated!

Answer 1

[Sebastian Castro]

Kurt,

I'd like to step back a little, if that's okay.

1. There is a display option on Simulink models that visual cues (badges) based on library links status. To access it, you can select Display > Library Links from the Simulink menu.

2. Alternatively, you could always run a model-wide check to test for disabled library links. You could write your own by searching through using the find_system function, or you can use built-in Model Advisor (Analysis > Model Advisor > Model Advisor) and run some of these checks.

Best, Sebastian

[Kurt Fischle]

Hi Sebastian, thanks for your answer! My problem is that I would like to display the warning as soon as possible when the user disables a link and forgets to lock the associated file.

Ideally, I would run the check immediately whenever a link is disabled; but as far as I know, Simulink does not provide a hook or callback for that event.

So my idea was to run the check whenever the user double clicks on a subsystem - which normally happens pretty often during editing.

[Sebastian Castro]

Well, how about this?

You can create a mask for your Subsystem block (right-click, select Mask > Create Mask ).

In the Initialization tab, you can add the following code:

Then, when your links are disabled you'll actually get a warning pop-up dialog! However, this won't be immediately when you open the block -- this will happen when the model updates before simulation, or when you hit Simulation > Update Diagram .