Resolving Conversion Problems, Use of the /COPY

Resolving Conversion Problems

Conversion problems may arise for one or more of the following reasons:

¹ The RPG III source has compilation errors

¹ Certain features of the RPG III language are not supported by R

¹ One or more /COPY compiler directives exists in the RPG III sourc

¹ Use of externally described data structures

¹Behavioral differences between the OPM and ILE run time

Each of these areas is discussed in the sections which follow.

Compilation Errors in Existing RPG III Code

The Conversion Aid assumes that you are attempting to convert a valid R program, that is, a program with no compilation errors. If this is not unpredictable results may occur during conversion. If you believe your contains compilation errors, compile it first using the RPG III compiler any errors before performing the conversion.

Unsupported RPG III Features

A few features of the RPG IIInot supportedlanguage arein RPG IV. The most notable of these are:

¹ The auto report function

¹ The FREE operation code

¹The DEBUG operation code

Since the

auto

report

function

not supported,

the

Conversion

Aid

will

ically expand these programs (that

is,

call

auto report)

prior to

perf

version

the

type

RPT

RPT38.

You

must

replace

the

FREE or DEBUG operation code with equivalent logic

before

after

conversion.

you

specify

the

CVTRPT(*YES) option on the CVTRPGSRC command, you will

receive

conversion

report

that identifies

most

these types

For

further

information

on

converting

auto

report

members, see

“Converting

Report

Source

Members”

page 389.

For

further

information

on

differenc

between

RPG

III

and

RPG

IV,

see

Appendix A,

“Behavioral

Differences

OPM

RPG/400

and

ILE

RPG

for

AS/400”

on

page 373.


Use of the /COPY	Compiler		Directive
In	some		cases,	errors	will not	be found	until you actually compile the
RPG	IV source. Conversion errors of this						type are usually related to
/COPY		compiler directive.			These	errors fall		into two categories: merging
and	context-sensitive problems. Following is						a	discussion of why these pr
occur		and how		you might	resolve	them.

398 ILE RPG for AS/400 Programmer's Guide

AS/400 specifications

The IBM AS/400, now known as the IBM iSeries, is a midrange computer system that has been a cornerstone of enterprise computing since its introduction in 1988. Designed to provide a robust platform for business applications, the AS/400 is celebrated for its reliability, scalability, and integrated database capabilities.

One of the key features of the AS/400 is its Integrated Operating Environment, which blends hardware and software resources seamlessly. This integration allows businesses to execute diverse workloads, ranging from traditional applications to modern web-based services, all on a single platform. The operating system, OS/400 (now IBM i), offers a rich set of APIs and tools for developers, simplifying application development and management.

Another standout characteristic of the AS/400 is its built-in database, DB2 for i. This powerful relational database management system allows for efficient data handling and provides advanced features such as support for SQL, XML, and JSON, making it easier for businesses to manage their data and integrate it with other systems. The database's tight integration with the operating system enables high performance and security.

In terms of scalability, the AS/400 can accommodate small businesses as well as large enterprises, with the ability to support hundreds of users simultaneously. Its architecture allows for easy upgrades in hardware, meaning that organizations can scale their systems without replacing the entire infrastructure.

Security is another critical attribute of the AS/400. With a sophisticated security model, it offers built-in user authentication, access control, encryption, and auditing capabilities to protect data and applications from unauthorized access.

The AS/400 also supports multiple programming languages, including RPG, COBOL, Java, and PHP, giving organizations the flexibility to choose the development tools that best fit their needs. This diversity helps maintain legacy applications while also developing new ones that leverage modern technologies.

Moreover, the platform supports both traditional green-screen interfaces and modern graphical user interfaces, allowing organizations to transition smoothly into contemporary user experience paradigms.

Overall, the IBM AS/400 stands out as a resilient, flexible, and secure computing platform that enables organizations to effectively manage their business operations, streamline processes, and adapt to changing market demands. Its unique combination of integrated features and capabilities ensures that it remains relevant in today's fast-paced technology landscape.

IBM AS/400 Resolving Conversion Problems, Compilation Errors in Existing RPG III Code, Directive

Models: AS/400