Import Function is not supported

Hi,

I am converting my MATLAB code into C code using MATLAB Coder. However, this error popped out while I'm trying to convert it.

It said that the import statements below are not supported.

How am I supposed to modify the code? I need it for my project to run smoothly.

Thank you.

Answer 1

[David Fink]

import is used to bring names into scope.

Instead of:

import x.y.*
functionInXY();

use

x.y.functionInXY();

Please contact MathWorks Technical Support to formally express your interest in supporting import in a future release.

[WanYu]

Hi,

Thanks for answering.

It is not working as it cannot recognise the function.

The imported files are written in Java, yet now I want to import it to my code so I can use the functions inside.

Thank you.

[David Fink]

Based on the import statements in the question, those appear to be packages, so calling them as functions will not work.

In fact, the .* syntax is not recommended in MATLAB. See the import page for details:

https://www.mathworks.com/help/matlab/ref/import.html

To remove the import-s, you will need to identify the functions and classes used in the body of decode that exist in those packages, and prepend the appropriate package name to each.

To draw a parallel to my example above, com.google.zxing.qrcode = x.y, but there may be various calls corresponding to functionInXY.

For example,

import com.google.zxing.qrcode
reader = QRCodeReader;

becomes

reader = com.google.zxing.qrcode.QRCodeReader;

[WanYu]

Hi,

I have tried the method shown, however it cannot recognised the "com" function.

[David Fink]

Doing some searching, those packages look like Java.

MATLAB Coder does not support calling Java.

MATLAB Compiler (not my area of expertise) might support calling Java from a MATLAB Compiler executable:

https://www.mathworks.com/help/compiler_sdk/package-integration.html

[WanYu]

Hi,

If I wish to call Java in my code from MATLAB Coder, it will not work?

[David Fink]

If generating a MEX file, MATLAB Coder can call into MATLAB (which can call Java) via coder.extrinsic.

If generating standalone C code, MATLAB Coder cannot call into MATLAB or Java.