IBM AS/400 manuály

Ibm AS/400 Uživatelský manuál (489 strany)

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ILE RPG for AS/400

1

Programmer's Guide

1

Third Edition (May 1999)

4

Contents

5

Trademarks and Service Marks

14

Notices xiii

15

About This Guide

17

How to Send Your Comments

18

What's New This Release?

19

About This Guide xix

21

About This Guide xxi

23

ILE RPG Introduction

25

RPG IV Specifications

27

Cycle Programming

28

Subprocedure logic

29

Indicators

29

Operation Codes

30

Example of an ILE RPG Program

30

1 6 10 16

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The Entire Source Program

34

Using the OS/400 System

36

Interacting with the System

36

AS/400 Tools

37

AS/400 Tools

38

AS/400 Tools

39

Program Creation

41

RPG Programming in ILE

42

Program Management

43

Program Call

43

Source Debugging

44

Bindable APIs

44

Multithreaded Applications

45

OPM-Compatible Application

47

Effect of ILE

48

Related Information

49

Advanced Application Scenario

54

A Strategy to Avoid

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A Strategy to Avoid

56

Procedures

57

Prototyped Calls

58

Multiple Procedures Module

59

The Entire ARRSRPT Program

65

Figure 24. DDS for CUSTFILE

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Coding Considerations

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General Considerations

69

Program Creation

70

Main Procedure Considerations

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Subprocedure Considerations

70

For Further Information

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Main Procedures

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Subprocedures

71

Prototyped Call

72

Concepts

73

ADTS/400: Programming

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Development Manager

75

Using SEU

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Using SEU

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Using SQL Statements

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Using SQL Statements

80

Using the CRTBNDRPG Command

81

Display spooled files

85

Using a Compiler Listing

87

Obtaining a Compiler Listing

87

Customizing a Page Heading

88

Customizing the Spacing

89

Correcting Compilation Errors

90

Using a Compiler Listing

91

Correcting Run-time Errors

92

CRTPGM Commands

97

Using the CRTRPGMOD Command

98

Creating a NOMAIN Module

99

Creating a Module Object

100

Creating a Module Object

101

Additional Examples

104

Related CL Commands

104

Using the CRTPGM Command

106

Binding Multiple Modules

108

Using a Binder Listing

109

Changing a Module or Program

110

Using the UPDPGM Command

111

Removing Observability

112

CL Reference (Abridged)

113

Service Program Overview

115

ILE Concepts

116

Reference (Abridged)

116

Changing A Service Program

117

Related CL commands

117

Sample Service Program

118

Sample Service Program

119

Sample Service Program

120

Creating the Service Program

121

Binding to a Program

122

Updating the Service Program

124

Sample Binder Listing

124

Chapter 9. Running a Program

127

CL Programming

128

Figure 48. DDS for EMPRPT2

130

Ending an ILE Program

133

Managing Activation Groups

133

Managing Activation Groups

134

Managing Activation Groups

135

Deleting an Activation Group

136

Reclaim Resources Command

136

CL Reference

137

(Abridged)

137

Heap Storage Problems

142

System API Reference

144

Calling Programs

152

Calling Procedures

152

The Call Stack

153

Recursive Calls

154

Using a Prototyped Call

157

Using the CALLP Operation

157

Calling within an Expression

158

Examples of Free-Form Call

159

Passing Prototyped Parameters

159

Parameter Passing Styles

159

Passing by Value

160

Using Operational Descriptors

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Omitting Parameters

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Passing *OMIT

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Leaving Out Parameters

164

Using %PARMS

165

4. Return

166

Order of Evaluation

170

Interlanguage Calls

170

Passing By Reference

171

Passing By Value

171

Examples of CALL and CALLB

174

Using the PLIST Operation

175

Normal End

176

Abnormal End

177

Returning from a Subprocedure

178

Using Bindable APIs

179

Calling a Graphics Routine

180

Calling Special Routines

181

Multithreading Considerations

181

Figure 74. Deadlock Example

184

¹ Obtain a dump

185

The ILE Source Debugger

187

Debug Commands

188

The ILE Source Debugger

189

Creating a Root Source View

191

Creating a COPY Source View

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Creating a Listing View

192

Creating a Statement View

193

STRDBG Example

195

Setting Debug Options

195

OPM source debug support

196

Program/module

197

Viewing the Program Source

198

Viewing a Different Module

199

Changing the View of a Module

200

BREAK line-number

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CLEAR line-number

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DISPLAY MODULE module-name

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Condition

206

BREAK Command

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procedure-name

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statement-number

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CLEAR PGM

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Characteristics of Watches

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Setting Watch Conditions

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Displaying Active Watches

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Removing Watch Conditions

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following

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Stepping Over Call Statements

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Stepping Into Call Statements

220

Displaying Data Structures

227

Displaying Indicators

228

Displaying UCS-2 Data

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Changing the Value of Fields

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EQUATE DC EVAL COUNTER

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DISPLAY EQUATE

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Exception Handling Overview

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which is active on

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ILE RPG Exception Handling

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Exception Handling Overview

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Using Exception Handlers

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Exception Handler Priority

247

Nested Exceptions

247

Unhandled Exceptions

247

Using Exception Handlers

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Using Exception Handlers

249

Optimization Considerations

250

Using RPG-Specific Handlers

250

ILE RPG for AS/400 Reference

251

Using an Error Subroutine

252

ILE Condition Handlers

262

Using a Condition Handler

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ILE Condition Handlers

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ILE Condition Handlers

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Using Cancel Handlers

268

Chapter 13. Obtaining a Dump

275

Example of a Formatted Dump

276

Feedback Areas

277

Example of a Formatted Dump

279

.L/ Optimization level

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not in the order

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Chapter 14. Defining Files

285

The SEQ Device

286

Naming Files

287

Types of File Descriptions

287

Types of File Descriptions

288

Renaming Record-Format Names

290

Renaming Field Names

290

Ignoring Record Formats

290

Using Output Specifications

293

Level Checking

294

Data Management

295

File Locking

299

Record Locking

300

Sharing an Open Data Path

301

Spooling

302

Output Spooling

303

SRTSEQ/ALTSEQ

304

Database Files

305

Data Files and Source Files

305

Record Format Specifications

306

Access Path

306

Valid Search Arguments

310

Referring to a Partial Key

310

ILE RPG for

311

AS/400 Reference

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Indexed File

312

Exception/Error Handling

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Sequential File

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Record Address File

314

Limits Records

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Relative Record Numbers

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Consecutive Processing

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Sequential-by-Key Processing

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This example is the

320

In this example, the

321

Random-by-Key Processing

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Valid File Operations

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Valid File Operations

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Valid File Operations

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Using Commitment Control

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Commitment Control Locks

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Commitment Control Scoping

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Using the COMMIT Operation

333

Using Commitment Control

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Using Commitment Control

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DDM Files

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Using Pre-V3R1 DDM Files

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DDM Files

338

Types of Device Files

339

Accessing Printer Devices

340

Specifying PRINTER Files

340

Handling Page Overflow

340

Accessing Printer Devices

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Accessing Printer Devices

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Specifying Fetch Overflow

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Accessing Tape Devices

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Accessing Display Devices

350

Using Sequential Files

350

Specifying a Sequential File

350

Using SPECIAL Files

351

Using SPECIAL Files

352

Using SPECIAL Files

353

ICF Programming

355

DDS Reference

355

Input fields

356

Output fields

356

Output/input (both) fields

356

Using Subfiles

359

RECNO field name

360

Reference

360

Use of Subfiles

361

Output Specifications

363

Input Specifications

364

Calculation Specifications

364

Additional Considerations

364

Valid WORKSTN File Operations

365

EXFMT Operation

366

READ Operation

366

WRITE Operation

366

Multiple-Device Files

366

Multiple-Device Files

367

Multiple-Device Files

368

Database Physical File

369

Main Menu Inquiry

370

CUSMAIN: RPG Source

371

Main Menu Inquiry

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File Maintenance

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File Maintenance

374

CUSMNT: RPG Source

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Search by Zip Code

382

Search by Zip Code

383

Search by Zip Code

384

SCHZIP: RPG Source

385

Search and Inquiry by Name

388

Search and Inquiry by Name

389

SCHNAM: RPG Source

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Search and Inquiry by Name

392

Appendixes

395

Compiling

397

DBCS Data in Character Fields

401

Conversion Overview

403

File Considerations

404

The Log File

405

Converting Your Source

406

The CVTRPGSRC Command

407

Converting Your Source

408

Converting Your Source

409

Performing a Trial Conversion

412

Obtaining Conversion Reports

413

Example of Source Conversion

414

Analyzing Your Conversion

417

Using the Conversion Report

418

Analyzing Your Conversion

419

Using the Log File

420

Resolving Conversion Problems

422

Unsupported RPG III Features

422

Merging Problems

423

Context-Sensitive Problems

424

Run-time Differences

427

Using CL Commands

429

CRTBNDRPG Command

430

CRTBNDRPG Command

431

CRTBNDRPG Command

432

CRTRPGMOD Command

444

CRTRPGMOD Command

445

CRTRPGMOD Command

446

Appendix D. Compiler Listings

447

Reading a Compiler Listing

448

Prologue

448

Compiler Listings

449

Source Section

450

Compiler Listings

452

Output Buffer Positions

456

/COPY Member Table

456

Compile-Time Data

457

Key Field Information

458

Cross-Reference Table

458

External References List

459

Message Summary

460

Final Summary

460

Bibliography

463

Bibliography 441

465

Special Characters

467

Numerics

467

See also

468

(continued)

469

Index 447

471

Index 449

473

Index 453

477

Index 459

483

Index 463

487

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