Sending values from a DialogApp to MainApp, Appdesigner

I try to send values from a DialogApp to a Mainapp. The following example worked for a while but now it doesn't . Can anyone tell me where my mistake is?

dialogApp:

properties (Access = private)

CallingApp % Description

end

% Callbacks that handle component events

methods (Access = private)

% Code that executes after component creation

function startupFcn(app, mainapp, uT, lT, uH, lH)

app.CallingApp = mainapp;

app.uppertresholdEditField.Value = uT;

app.lowertresholdEditField.Value=lT;

app.upperhysteresisthresholdEditField.Value=uH;

app.lowerhysteresisthresholdEditField.Value=lH;

end

% Button pushed function: SaveButton

function SaveButtonPushed(app, event)

get_adv_edg_data(app.CallingApp,app.uppertresholdEditField.Value,app.lowertresholdEditField.Value,app.upperhysteresisthresholdEditField.Value,app.lowerhysteresisthresholdEditField.Value);

delete(app)

% Close request function: UIFigure

function AdvEdg_Closerequest(app, event)

% Delete the dialog box

delete(app)

end

end

MainApp

properties (Access = private)

DialogApp

upT=0;

loT=0;

upH=0;

loH=0;

end

methods (Access = public)

function get_adv_edg_data(app,uT, lT, uH, lH)

app.upT=uT;

app.loT=lT;

app.upH=uH;

app.loH=lH;

end

end

methods (Access = private)

function startupFcn(app)

get_adv_edg_data(app,app.upT,app.loT,app.upH,app.loH);

end

%functions follow which should the values

end

[Harald]

Hi,

in what way does it not work anymore? If you are getting an error message, please post it.

Please consider attaching the .mlapp files to make it easier to reproduce the problem.

Best wishes,

Harald

[Mohammad Sami]

I dont see where do you call the dialog app in your main app.

Answer 1

[Amish]

Hi Furkan,

The code you provided seems to be an attempt to pass values from a dialog app to a main app in MATLAB App Designer. There are some issues with the code that has been posted along with your question, but it is difficult to gauge the exact issues without the Error or warnings attached.

Please have a look at the following code snippets for each of the codes, containing the corrections to the possible issues with the code.

DialogApp:

classdef DialogApp < matlab.apps.AppBase

    properties (Access = private)
        CallingApp % Description 
    end

    % Callbacks that handle component events    
    methods (Access = private)

        % Code that executes after component creation
        function startupFcn(app, mainapp, uT, lT, uH, lH)
            app.CallingApp = mainapp;
            app.uppertresholdEditField.Value = uT;
            app.lowertresholdEditField.Value = lT;
            app.upperhysteresisthresholdEditField.Value = uH;
            app.lowerhysteresisthresholdEditField.Value = lH;    
        end
        
        % Button pushed function: SaveButton
        function SaveButtonPushed(app, event)
            % Pass values to the main app using the CallingApp reference
            app.CallingApp.get_adv_edg_data(...
            app.uppertresholdEditField.Value, ...
            app.lowertresholdEditField.Value, ...
            app.upperhysteresisthresholdEditField.Value, ...
            app.lowerhysteresisthresholdEditField.Value);
            
            % Close the dialog
            delete(app); 
        end
        
        % Close request function: UIFigure
        function AdvEdg_Closerequest(app, event)
            % Delete the dialog box
            delete(app);
        end
    end
end

MainApp:

classdef MainApp < matlab.apps.AppBase
    properties (Access = private)
        DialogApp
        upT = 0;
        loT = 0;
        upH = 0;
        loH = 0;        
    end
    
    methods (Access = public)

        function get_adv_edg_data(app, uT, lT, uH, lH)
            
            % This method should be able to update the MainApp's properties
            app.upT = uT;
            app.loT = lT;
            app.upH = uH;
            app.loH = lH;
            
            % You can include additional logic to update the UI here if needed            
        end
    end
    
    methods (Access = private)

        % This method will be called when MainApp is created
        function startupFcn(app)
            % Create the dialog app, passing the MainApp instance and default values
            app.DialogApp = DialogApp(app, app.upT, app.loT, app.upH, app.loH); 
        end
        % Other methods for MainApp functionality follow here 
    end 
end

The DialogApp needs to be initialized when creating it in the startupFcn. The Values of the MainApp are passed throught the reference of the get_adv_edg_data method in the DialogApp.

Additionally, you can also refer to the some of the documentations:

https://www.mathworks.com/help/matlab/creating_guis/creating-multiwindow-apps-in-app-designer.html

https://www.mathworks.com/matlabcentral/fileexchange/63975-user-s-dialog-example-for-app-designer

The following answers might also help:

https://www.mathworks.com/matlabcentral/answers/561089-passing-data-between-apps

https://www.mathworks.com/matlabcentral/answers/1446339-how-to-store-data-from-dialogapp-in-callingapp-while-closing-the-dialogapp-in-app-designer

Hope this helps!