How to get the class instance 'calling' path

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?

Answer 1

[Ludo Houben]

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);

Answer 2

[Pratyush]

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.

[Ludo Houben]

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

Answer 3

[Ludo Houben]

This is a simpeler solution if running simulink in interpreted execution

sInstancePath = gcb;        % Get instance path
warning(sInstancePath);     % Display warning with the path info

https://nl.mathworks.com/help/simulink/slref/gcb.html#