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OBJECTARX™ DEVELOPER’S GUIDE

00120-010000-5060 January 19, 1999

12345678910

AUTODESK, INC. MAKES NO WARRANTY, EITHER EXPRESSED OR IMPLIED, INCLUDING BUT NOT LIMITED TO ANY

IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, REGARDING THESE MATERIALS

AND MAKES SUCH MATERIALS AVAILABLE SOLELY ON AN “AS-IS” BASIS.

IN NO EVENT SHALL AUTODESK, INC. BE LIABLE TO ANYONE FOR SPECIAL, COLLATERAL, INCIDENTAL, OR

CONSEQUENTIAL DAMAGES IN CONNECTION WITH OR ARISING OUT OF PURCHASE OR USE OF THESE MATERIALS. THE

SOLE AND EXCLUSIVE LIABILITY TO AUTODESK, INC., REGARDLESS OF THE FORM OF ACTION, SHALL NOT EXCEED THE

PURCHASE PRICE OF THE MATERIALS DESCRIBED HEREIN.

Autodesk, Inc. reserves the right to revise and improve its products as it sees fit. This publication describes the state of this product

at the time of its publication, and may not reflect the product at all times in the future.

Autodesk Trademarks

The following are registered trademarks of Autodesk, Inc., in the USA and/or other countries: 3D Plan, 3D Props, 3D Studio, 3D

Studio MAX, 3D Studio VIZ, 3D Surfer, ADE, ADI, Advanced Modeling Extension, AEC Authority (logo), AEC-X, AME, Animator

Pro, Animator Studio, ATC, AUGI, AutoCAD, AutoCAD Data Extension, AutoCAD Development System, AutoCAD LT, AutoCAD

Map, Autodesk, Autodesk Animator, Autodesk (logo), Autodesk MapGuide, Autodesk University, Autodesk View, Autodesk

WalkThrough, Autodesk World, AutoLISP, AutoShade, AutoSketch, AutoSolid, AutoSurf, AutoVision, Biped, bringing information

down to earth, CAD Overlay, Character Studio, Design Companion, Drafix, Education by Design, Generic, Generic 3D Drafting,

Generic CADD, Generic Software, Geodyssey, Heidi, HOOPS, Hyperwire, Inside Track, Kinetix, MaterialSpec, Mechanical Desktop,

Multimedia Explorer, NAAUG, Office Series, Opus, PeopleTracker, Physique, Planix, Rastation, Softdesk, Softdesk (logo), Solution

3000, Tech Talk, Texture Universe, The AEC Authority, The Auto Architect, TinkerTech, WHIP!, WHIP! (logo), Woodbourne,

WorkCenter, and World-Creating Toolkit.

The following are trademarks of Autodesk, Inc., in the USA and/or other countries: 3D on the PC, ACAD, ActiveShapes, Actrix,

Advanced User Interface, AEC Office, AME Link, Animation Partner, Animation Player, Animation Pro Player, A Studio in Every

Computer, ATLAST, Auto-Architect, AutoCAD Architectural Desktop, AutoCAD Architectural Desktop Learning Assistance,

AutoCAD DesignCenter, Learning Assistance, AutoCAD LT Learning Assistance, AutoCAD Simulator, AutoCAD SQL Extension,

AutoCAD SQL Interface, AutoCDM, Autodesk Animator Clips, Autodesk Animator Theatre, Autodesk Device Interface, Autodesk

PhotoEDIT, Autodesk Software Developer’s Kit, Autodesk View DwgX, AutoEDM, AutoFlix, AutoLathe, AutoSnap, AutoTrack, Built

with ObjectARX (logo), ClearScale, Concept Studio, Content Explorer, cornerStone Toolkit, Dancing Baby (image), Design Your

World, Design Your World (logo), Designer’s Toolkit, DWG Linking, DWG Unplugged, DXF, Exegis, FLI, FLIC, GDX Driver, Generic

3D, Heads-up Design, Home Series, Kinetix (logo), MAX DWG, ObjectARX, ObjectDBX, Ooga-Chaka, Photo Landscape,

Photoscape, Plugs and Sockets, PolarSnap, Powered with Autodesk Technology, Powered with Autodesk Technology (logo),

ProConnect, ProjectPoint, Pro Landscape, QuickCAD, RadioRay, SchoolBox, SketchTools, Suddenly Everything Clicks,

Supportdesk, The Dancing Baby, Transforms Ideas Into Reality, Visual LISP, and Volo.

Third Party Trademarks

Élan License Manager is a trademark of Élan Computer Group, Inc.

Microsoft, Visual Basic, Visual C++, and Windows are registered trademarks and Visual FoxPro and the Microsoft Visual Basic

Technology logo are trademarks of Microsoft Corporation in the United States and other countries.

All other brand names, product names or trademarks belong to their respective holders.

Third Party Software Program Credits

Portions of this software are based on the work of the Independent JPEG Group.

GOVERNMENT USE

Use, duplication, or disclosure by the U. S. Government is subject to restrictions as set forth in FAR 12.212 (Commercial Computer

Software-Restricted Rights) and DFAR 227.7202 (Rights in Technical Data and Computer Software), as applicable.

iii

Contents

About ObjectARX Documentation . . . . . . . . . . . . . . . . . . . . . . . . . . 1

The ObjectARX Documentation Set . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

Printed Guides . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

Online Documentation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

ObjectARX Logo Program . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

Where to Start . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

Using This Guide. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

Organization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

Part I Using ObjectARX. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Chapter 1 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

The ObjectARX Programming Environment . . . . . . . . . . . . . . . . . . . . . . . . 8

Accessing the AutoCAD Database . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Interacting with the AutoCAD Editor . . . . . . . . . . . . . . . . . . . . . . . . . 8

Creating User Interfaces with MFC . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Supporting MDI . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Creating Custom Classes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Building Complex Applications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Interacting with Other Environments. . . . . . . . . . . . . . . . . . . . . . . . . 9

ObjectARX Class Libraries. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

AcRx Library. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

AcEd Library. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

AcDb Library . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

AcGi Library . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

AcGe Library. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Getting Started . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

iv | Contents

System Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Installing ObjectARX. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Chapter 2 Database Primer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

AutoCAD Database Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

Multiple Databases . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

Obtaining Object IDs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

Essential Database Objects . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

Creating Objects in AutoCAD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

Creating Objects in ObjectARX . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

Creating Entities . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

Creating a New Layer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

Opening and Closing ObjectARX Objects . . . . . . . . . . . . . . . . . . . . 27

Adding a Group to the Group Dictionary. . . . . . . . . . . . . . . . . . . . . 28

Chapter 3 ObjectARX Application Basics. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

Creating an ObjectARX Application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

Creating Custom Classes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

Responding to AutoCAD Messages . . . . . . . . . . . . . . . . . . . . . . . . . . 31

Implementing an Entry Point for AutoCAD. . . . . . . . . . . . . . . . . . . 36

Initializing an ObjectARX Application . . . . . . . . . . . . . . . . . . . . . . . 37

Preparing for Unloading . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38

Example Application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39

Registering New Commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40

Command Stack . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40

Lookup Order . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42

Global versus Local Command Names . . . . . . . . . . . . . . . . . . . . . . . 42

Transparent versus Modal Commands . . . . . . . . . . . . . . . . . . . . . . . 42

Loading an ObjectARX Application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43

The Library Search Path . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43

Listing Loaded ObjectARX Applications. . . . . . . . . . . . . . . . . . . . . . 43

Unloading an ObjectARX Application . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44

Unlocking Applications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44

Demand Loading . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45

AutoCAD, the Windows System Registry, and ObjectARX Applica-

tions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46

Modification of the Registry at ObjectARX Application Installation 47

The DEMANDLOAD System Variable . . . . . . . . . . . . . . . . . . . . . . . . 49

Demand Loading on Detection of Custom Objects . . . . . . . . . . . . . 50

Demand Loading on Command . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51

Demand Loading on AutoCAD Startup . . . . . . . . . . . . . . . . . . . . . . 52

Managing Applications with the System Registry . . . . . . . . . . . . . . 52

ARX Command. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53

Contents | v

?—List Applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53

Load . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53

Unload . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53

Commands. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53

Options. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53

Running ObjectARX Applications from AutoLISP . . . . . . . . . . . . . . . . . . . 55

Error Handling. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55

Chapter 4 Database Operations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59

Initial Database . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60

Creating and Populating a Database. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60

Saving a Database . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61

Setting the Default File Format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61

Global Save Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63

The wblock Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63

Creating a New Database from an Existing Database . . . . . . . . . . . . 63

Creating a New Database with Entities . . . . . . . . . . . . . . . . . . . . . . . 64

Inserting a Database . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65

Setting Current Database Values. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66

Database Color Value. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66

Database Linetype Value . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66

Database Linetype Scale Value. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66

Database Layer Value . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67

Example of Database Operations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67

Long Transactions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69

Class and Function Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69

Long Transaction Example . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71

External References . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74

External Reference Pre- and Post-Processing . . . . . . . . . . . . . . . . . . . 75

File Locking and Consistency Checks . . . . . . . . . . . . . . . . . . . . . . . . 76

Indexes and Filters. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77

Drawing Summary Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79

Last Saved by Autodesk Software . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80

Chapter 5 Database Objects . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81

Opening and Closing Database Objects . . . . . . . . . . . . . . . . . . . . . . . . . . . 82

Deleting Objects . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85

Database Ownership of Objects . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85

Adding Object-Specific Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 86

Extended Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 86

Extension Dictionary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 89

Erasing Objects . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 94

Object Filing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 95

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