Compiled Matlab Stand Alone app does not find a mex file

Hi there,

I have developed a matlab app which uses a set of external functions. In turn, one of these functions uses the Screen function of Pyschtoolbox package. When I use the build in Run of matlab (to test the app) everything works fine. However, when I compile the app and I install it as stand alone, it does not work.

Then, with a try catch, I have printed the error in a text area:

MATLAB:mex:ErrInvalidMEXFile -- Invalid MEX-file 'C:\Users\myusername\AppData\Local\Temp\myusername\mcrCache9.8\myapp0\myapp\Screen.mexw64': Cannot find the specified module.

I have added the Screen.mexw64 to the list of "Files required for your application to run" and, indeed, if I look in the above mentioned path, I am able to find the Screen.mexw64 file.

Have you any solution?

Thanks :)

[Walter Roberson]

Some DLL needed by Screen.mexw64 cannot be located.

[youngz]

There is a way to identify the dependencies of a specific mex function?

[Walter Roberson]

https://www.raymond.cc/blog/check-what-dll-or-ocx-dependency-files-is-needed-for-a-software/

Answer 1

[Shivam Lahoti]

Hi youngz,

I understand you are getting a "MATLAB:mex:ErrInvalidMEXFile" error.

I can see a probable solution discussed in comments. However, this could be two of the possible solutions as well:

1. If the application functions correctly on the computer where the MEX-file was compiled but not on another machine, consider recompiling the MEX-file on the new machine.
2. This error may also occur if the Visual C++ redistributable is missing, leading to a dependency issue.

To identify missing library dependencies, download "Dependency Walker" from the following link: http://www.mathworks.com/help/matlab/matlab_external/invalid-mex-file-error.html

Install one of the supported versions of the compiler (Microsoft Visual C++ only) on the machine, which will automatically install the redistributable. You can find the list of supported compilers here: https://www.mathworks.com/support/requirements/supported-compilers.html

I hope this would be helpful to resolve this and similar queries.

Regards,

Shivam.