MATLAB BUILDER JA 2 Guide de l'utilisateur télécharger pdf (Page 67)

Handling Errors

if (cls != null)

cls.dispose();

}

Note that in this case, it is the programmer’s responsibility to return

something reasonable from the method in case of an error.

The

finally clause in the example contains code that executes after all

other processing in the

try block is executed. This code executes wh ether or

not an exception occurs or a control flow statement like

return or break

is executed. It is common practice to include any cleanup code that m ust

execute before leaving the function in a

finally block. The documentation

examples use

finally blocks in all the code samples to free native resources

that were allocated in the method.

For more information on free ing resources, se e “Managing Native Resources”

on page 3-25.

Code Fragment: Handling an Exception in the Calling Function

In this next example, the method that calls myprimes declares that it throws

MWException:

public double[] getprimes(int n) throws MWException

{

myclass cls = null;

Object[] y = null;

try

{

cls = new myclass();

y = cls.myprimes(1, new Double((double)n));

return (double[])((MWArray)y[0]).getData();

}

finally

{

MWArray.disposeArray(y);

if (cls != null)

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MATLAB BUILDER JA 2 Guide de l'utilisateur Page 67