DEBUGGING FOR STANDALONE APP ?

Hope you are all doing well

I made an app using app designer to read a counter by screen shot using screencapture.m and to turn the light green if the number changed or red if stayed the same , when run with matlab it works great , but when trying it as a standalone exe on the same laptop the program does not work

classdef neuro < matlab.apps.AppBase
    % Properties that correspond to app components
    properties (Access = public)
        UIFigure     matlab.ui.Figure
        Lamp         matlab.ui.control.Lamp
        LampLabel    matlab.ui.control.Label
        startButton  matlab.ui.control.Button
    end
    % Callbacks that handle component events
    methods (Access = private)
        % Button pushed function: startButton
        function startButtonPushed(app, event)
            for in=1:inf
                imageData = screencapture(0,   [700,700,150,100]);
                imwrite(imageData,'flag.jpg');
                flag=ocr(imread('flag.jpg'))
                n=str2num(flag.Text)
                pause(.5)
                imageData = screencapture(0,   [700,700,150,100]);
                imwrite(imageData,'flag.jpg');
                flag=ocr(imread('flag.jpg'))
                x=str2num(flag.Text)
                image= uiimage(app.UIFigure,"ImageSource",'flag.jpg');
                image.Position=[256,288,200,200];
                if mod(n,1)==0 
                    if mod(x,1)==0
                        if x==n
                            app.Lamp.Color = 'r'
                        else
                            app.Lamp.Color = 'g'
                        end
                    end
                end
            end

[Steven Lord]

What does "does not work" mean in this context?

• Do you receive warning and/or error messages? If so the full and exact text of those messages (all the text displayed in orange and/or red in the Command Window) may be useful in determining what's going on and how to avoid the warning and/or error.
• Does it do something different than what you expected? If so, what did it do and what did you expect it to do?
• Did MATLAB crash? If so please send the crash log file (with a description of what you were running or doing in MATLAB when the crash occured) to Technical Support so we can investigate.

[Rakan Khair]

Thank you for your reply

1-No Matlab work great and no error messages

2-when pressing the button for the standalone app nothing happens , but when pressing it using run in matlab appdesigner it works perfectly , the light goes red if number does not increase and green if it incease . in the designer the lamp does not change while the flag.jpg is changing.

3-no crash .

I am afraid that the app does not take OCR libarary because flag.jpg always changing as it is intended, is there anyway to debeug the app afte making it standalone?

Answer 1

[Rakan Khair]

The issue was that I had to make matlab delete the old jpg file

I changed the code to

imageData = screencapture(0,   [700,700,150,100]);
imwrite(imageData,'count.jpg');
flag=ocr(imread('count.jpg'))
n=str2num(flag.Text)
delete ('count.jpg')
imageData = screencapture(0,   [700,700,150,100]);
imwrite(imageData,'count.jpg');
flag=ocr(imread('count.jpg'))
x=str2num(flag.Text)
delete ('count.jpg')
if mod(n,1)==0 
    if mod(x,1)==0
        if x==n
            app.Lamp.Color = 'r'
            app.Label_2.Text=num2str(n)
            pause(.5)
        else
            app.Lamp.Color = 'g'
            app.Label_2.Text=num2str(n)
            pause(.5)
        end
    end
end

[Walter Roberson]

You could have done

imageData = screencapture(0,   [700,700,150,100]);
flag = ocr(imageData);

without needing to write to file at all.