Error Checking in Standalone Application

Hello Everyone, I deployed a Standalone Application using MATLAB Application Compiler 2022b In that I have encountered that the App which is working perfectly fine in MATLAB didnt work while deploying it as a Standalone.

1. How to check the errors occuring in the Standalone App. I tried to run the stand alone application through the command prompt but still didn't get any error messages or warnings.
2. I have kept a file read in MATLAB in which I have specified the folder path in which the code has to get the input (which I added as a Supporting folder while packaging the app) which is necessary for the project. Is there any alternate options to read that .txt file without mentioning the folder path. { I think this may be the error}

Kindly help to correct these problems

Answer 1

[akshatsood]

Hi @Sri Janani Egambaram,

From your description, it seems that the application works perfectly within MATLAB but encounters issues once deployed. This is a common scenario, and there are a few steps you can take to diagnose and resolve the problem.

Debugging the Standalone Application

Command Prompt Execution- Since you mentioned running the application through the command prompt without receiving error messages, ensure that you are using the correct syntax and that the command prompt is set to the directory containing your executable. Use the "-logfile" option to redirect output to a file:

myApp.exe -logfile output.log

Handling File Paths - If you suspect the issue is related to file paths, consider the following:

Relative Path - Use relative paths instead of absolute paths. This ensures that your application can locate files regardless of the installation folder:

fileID = fopen(fullfile(pwd, 'input.txt'));

MATLAB "isdeployed" Function - Use the "isdeployed" function to determine if the code is running in a deployed environment and adjust file paths accordingly:

Reference - https://www.mathworks.com/help/releases/R2022b/compiler/writing-deployable-matlab-code.html

if isdeployed
    % Adjust path for deployed application
    inputFilePath = fullfile(ctfroot, 'input', 'input.txt');
else
    % Path for MATLAB environment
    inputFilePath = fullfile(pwd, 'input.txt');
end
fileID = fopen(inputFilePath);

Packaging Supporting Files - Ensure that supporting files are correctly packaged with your application. During the packaging process, add the necessary files under the "Files required for your application to run" section in the Application Compiler. Here are some general tips to ensure a smooth deployment of your application:

• Make sure that all dependencies and toolboxes required by your app are included in deployment package.
• Verify that the correct version of MATLAB Runtime is installed on the target machine.
• Implement error handling in your MATLAB code using "try-catch" blocks to catch and display errors. This can help identify issues when running the standalone application.

Please refer to the following documentation for some common faliures while deploying the standalone application:

https://www.mathworks.com/help/releases/R2022b/compiler/does-the-failure-occur-when-deploying-the-application-to-end-users.html

Also, be aware of the limitations associated with compiling and deploying your code. This will help you write code that compiles and deploys smoothly, minimizing potential issues.

https://www.mathworks.com/help/releases/R2022b/compiler/limitations-about-what-may-be-compiled.html

By following these steps, you should be able to diagnose and resolve the errors in your standalone application.

I hope this helps.