MATLAB BUILDER JA 2 Guide de l'utilisateur télécharger pdf (Page 65)

Handling Errors

Errors that occur during execution of an M-function or during data conversion

are s ignaled by a standard Java exception. This includes MATLAB run-time

errors as well as errors in your M-code.

In ge neral, there are two types of exceptions in Java: checked exceptions

and unchecked exceptions.

Handling Checked Exceptions

Checked exceptions must be de clared as thrown b y a m ethod using the Java

language

throws claus e. Java Builder components support one checked

exception:

com.mathworks.toolbox.javabuilder.MWException.This

exception class inherits from

java.lang.Exception and is thrown by every

MATLAB Compiler generated Java m ethod to signal that an error has

occurred during the call. All normal MATLAB run-time errors, as well as

user-created errors (e.g., a calling e rror in your M-code) are manifested as

MWExceptions.

The Java interface to each M-function declares itself as throwing an

MWException using the throws clause. For example, the myprimes M-function

shown previously has the following interface:

/* mlx interface List version */

public void myprimes(List lhs, List rhs) throws MWException

{

(implementation omitted)

}

/* mlx interface Array version */

public void myprimes(Object[] lhs, Object[] rhs) throws MWException

{

(implementation omitted)

}

/* Standard interface no inputs*/

public Object[] myprimes(int nargout) throws MWException

{

(implementation omitted)

}

/* Standard interface one input*/

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MATLAB BUILDER JA 2 Guide de l'utilisateur Page 65