IBM AS/400 manual Handling Exceptions, Exception Handling Overview

Exception Handling Overview

Chapter 12. Handling Exceptions

This chapter explains how ILE RPG exception handling works, and how to

¹Exception handlers

¹ ILE RPG-specific handlers

¹ ILE condition handlers

¹Cancel handlers

ILE RPG supports the following types of exception handlers:

¹ RPG-specific handlers,	for	example,	the	use of an error indicator
tion code extender,	or a	*PSSR or	INFSR	error subroutine.

¹ILE condition handlers, user-written exception handlers that you reg

time using the ILE condition handler bindable API CEEHDLR.

¹ ILE cancel handler			which	can	be	used when		a procedure	ends	abno
Most	programs	benefit	from	some	sort	of	planned	exception handling		bec
can	minimize	the number of		unnecessary			abnormal	ends (namely,	those	as

with function checks). ILE condition								handlers also allow you to handle
mixed-language applications in a							consistent		manner.
You	can	use	the	RPG	exception		handlers		to handle most situations tha
in a RPG application. The minimum							level of exception handling which RPG
vides is		the	use	of	error	indicators			on certain operations. To lear
read	the following			sections		in	this	chapter:

¹ “ILE RPG Exception Handling” on page 220

¹“Specifying Error Indicators or the 'E' Operation Code Extender” on

Additionally, to learn how ILE exception handling works, read:

¹ “Exception Handling Overview” (for general concepts)

¹ “Using RPG-Specific Handlers” on page 226

¹The sections on error handlingILE Conceptsin .

For information on exception handling and the RPGILE cycle,RPG forseeAS/400

Reference.

Note: In this book the term 'exception handling' is used to refer to handling and error handling. However, for consistency with other terms, the term 'error' is used in the context of 'error indic subroutine'.

Exception Handling Overview

Exception	handling is the	process	of:
¹ Examining	an exception	message	which has been issued as a result
time error

¹Optionally modifying the exception to show that it has been rece handled)

 Copyright IBM Corp. 1994, 1999 217