Exportapp error in saving entire app designer GUI

Hi,

I am trying to use the exportapp function to save the entire app designer GUI but I get this error:

Error using exportapp
Specified handle is not valid for export.

Any idea why? can I change the DPI of the image?

Code:

classdef app1 < matlab.apps.AppBase
    % Properties that correspond to app components
    properties (Access = public)
        UIFigure         matlab.ui.Figure
        PlotGraphButton  matlab.ui.control.Button
        SaveGUIButton    matlab.ui.control.Button
        UIAxes           matlab.ui.control.UIAxes
    end
    % Callbacks that handle component events
    methods (Access = private)
        % Button pushed function: SaveGUIButton
        function SaveGUIButtonPushed(app, event) 
            filter = {'*.jpg';'*.png';'*.tif';'*.pdf'};
            [filename,filepath] = uiputfile(filter);
            if ischar(filename)
                exportapp(app.UIAxes,[filepath filename]);
            end
        end
        % Button pushed function: PlotGraphButton
        function PlotGraphButtonPushed(app, event)
            x = linspace(0,2*pi,100);
            y = sin(x);
            plot(app.UIAxes,x,y)
        end
    end
    % Component initialization
    methods (Access = private)
        % Create UIFigure and components
        function createComponents(app)
            % Create UIFigure and hide until all components are created
            app.UIFigure = uifigure('Visible', 'off');
            app.UIFigure.Position = [100 100 640 480];
            app.UIFigure.Name = 'MATLAB App';
            % Create UIAxes
            app.UIAxes = uiaxes(app.UIFigure);
            title(app.UIAxes, 'Title')
            xlabel(app.UIAxes, 'X')
            ylabel(app.UIAxes, 'Y')
            zlabel(app.UIAxes, 'Z')
            app.UIAxes.Position = [185 185 306 243];
            % Create SaveGUIButton
            app.SaveGUIButton = uibutton(app.UIFigure, 'push');
            app.SaveGUIButton.ButtonPushedFcn = createCallbackFcn(app, @SaveGUIButtonPushed, true);
            app.SaveGUIButton.Position = [418 73 102 47];
            app.SaveGUIButton.Text = 'Save GUI';
            % Create PlotGraphButton
            app.PlotGraphButton = uibutton(app.UIFigure, 'push');
            app.PlotGraphButton.ButtonPushedFcn = createCallbackFcn(app, @PlotGraphButtonPushed, true);
            app.PlotGraphButton.Position = [163 73 125 47];
            app.PlotGraphButton.Text = 'Plot Graph';
            % Show the figure after all components are created
            app.UIFigure.Visible = 'on';
        end
    end
    % App creation and deletion
    methods (Access = public)
        % Construct app
        function app = app1
            % Create UIFigure and components
            createComponents(app)
            % Register the app with App Designer
            registerApp(app, app.UIFigure)
            if nargout == 0
                clear app
            end
        end
        % Code that executes before app deletion
        function delete(app)
            % Delete UIFigure when app is deleted
            delete(app.UIFigure)
        end
    end
end

Answer 1

[Simon Chan]

It support figure object and hence you should use:

exportapp(app.UIFigure,[filepath filename]);

[Ali razi]

Thanks. Can it be saved in 500DPI?

[Simon Chan]

If you want to specify resolution, you may use function exportgraphics. For this function, you can select axis as the object as well.

exportgraphics(app.UIAxes,fullfile(filepath,filename),'Resolution',500);

[Ali razi]

exportgraphics with app.UIAxes or app.UIFigure only export the Axes and not in 500DPI (with the .'Resolution',500).

On the other hand exportapp(app.UIFigure,[filepath filename]); save the GUI but with 96DPI.

Any idea why and how to proceed?

[Simon Chan]

I just try to save a figure using exportgraphics by using TIF format and the resolution can be 500 DPI.

On the other hand, you may try to use function print

print(app.UIFigure,'-djpeg','-r500','filename')