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How to get the class instance 'calling' path

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Hi all
I'm working on a class and I have added an error() message to a part of the code. However within my model several instances of the class will be available and I would like to know which instance is throwing the error. How can I find the instance 'calling' path (see red rectangle) within the class itself?

Accepted Answer

Ludo Houben
Ludo Houben on 26 Oct 2023
The following 'works' when simulink is running in code generation execution when creating a class
% Create a property of the type string
properties (Nontunable)
sInstanceName string ='FB_TriggerBuffer';
end
% Create an 'InitFcn' callback function and update the property
set_param(gcb,'sInstanceName',gcb)
% The propery can now be used in the code
warning(sInstanceName);

More Answers (2)

Pratyush
Pratyush on 25 Oct 2023
Hi Ludo,
I understand that you have added an error message in your class and you want to know which instance of the class has generated the error.
In MATLAB, you can use the "dbstack" function to obtain the call stack information, including the calling path within the class. You can refer to the following documentation for more information: https://in.mathworks.com/help/matlab/ref/dbstack.html
Here is an example how "dbstack" could be used to get the instance that throws the error:
classdef MyClass
properties
name
end
methods
function obj = MyClass(name)
obj.name = name;
end
function error(obj)
stack = dbstack();
calling_path = stack(1);
disp(['Error occurred in instance ''' obj.name ''' at line ' num2str(calling_path.line) ' in file ' calling_path.file]);
end
end
end
Hope this helps.
  1 Comment
Ludo Houben
Ludo Houben on 25 Oct 2023
Hi Pratyush
Thank you for your solution. This works....however not completely. It works in 'Interpreted Execution', but not for 'Code Generation' simulation. Is there a solution for this?
Regards
Ludo

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Ludo Houben
Ludo Houben on 26 Oct 2023
This is a simpeler solution if running simulink in interpreted execution
sInstancePath = gcb; % Get instance path
warning(sInstancePath); % Display warning with the path info

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