Mechanism of specific exceptions

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Overview
Declaration syntaxes
Process of simple exception
Process of advanced exception
Functions for managing the specific exceptions

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See also

General exception mechanism

Mechanism of specific exceptions

Overview

A process of specific exception is used to process a risky code (which means a code that could trigger an exception). The exception will be triggered if a programming error occurs in the specified code.

This specific exception process will only be available in the process in which it was declared.

Remarks

A specific exception process can be declared in any process.
A specific exception process has priority over a general exception process.
After the execution of an exception process, the WLanguage code following the process is run.
A specific exception process cannot be declared in another specific exception process.

Versions 19 and later

The mechanism of specific exceptions is now available in Browser code.

New in version 19

The mechanism of specific exceptions is now available in Browser code.

The general exception process is not available.

Declaration syntaxes

Process of simple exception

WHEN EXCEPTION IN
<"Code that can trigger an exception">
DO
<"Code for processing the exception">
END
<Rest of code>

Process of advanced exception

WHEN EXCEPTION IN
<"Code that can trigger an exception">
DO
<"Code for processing the exception">
ELSE
<"Code used if the exception is not triggered">
END
<Rest of code>

Functions for managing the specific exceptions

Some functions specific to the management of the exceptions can be used in the processes of specific exceptions:


ExceptionInfo	Retrieves the information regarding the error processed by the exception (this function replaces the exception variables used in WINDEV 5.5).
ExceptionPropagate	Propagates an exception.
ExceptionThrow	Artificially triggers an exception process for a given error.