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ObjectARX&Dummies 教程（一）——Overview

一个巴西人写的 ObjectARX 教程，其后面所讲到的自定义实体

的教程，应该是这方面最好的教程了。

呵呵，没时间翻译，大家就将就着看英文吧。

Class 1 - Overview

Introduction

ObjectARX is an AutoCAD Runtime Extension.

With ObjectARX SDK you can build applications that will alow you to

extend AutoCAD features like commands, dialog boxes, entities, objects

and much more.

The ObjectARX application is actually a DLL that is loaded into

AutoCAD environment and allows you to access new features as

mentioned above. To be able to build these DLLs you need to follow

some basic rules to setup Microsoft Visual Studio.NET environment and

assert your application will respect AutoCAD requirements.

The performance of this application will be the same of native

features. By the way, Autodesk uses ObjectARX to build vertical

products you may already know like Autodesk MAP and Architectural

Desktop, among many others.

User Requirements

Because ObjectARX is not a simple customization tool, some

requirements must be observed to allow you to be able to proceed. If you

don't match these requirements I would recommend you to first increase

your skills and then go back to try this course.

The minimum requirements to learn at least basic ObjectARX are:

（1） Basic Visual Studio.NET concepts;

（2） Average C++ knowledge;

（3） Advanced AutoCAD knowledge;

（4） MFC (Microsoft Foundation Classes) concepts;

（5） Object Oriented Techniques;

As mentioned before, this course is not intended to be a complex

guide or even cover advanced features. I believe you can go further by

yourself after learn the basic features and mainly the basic concepts

which are the secret of ObjectARX.

I will not cover .NET Framework capabilities to make the course as

much simple as I can. Once you learn and figure out how AutoCAD

works from inside you will open your mind to ObjectARX capabilities

and will be able to build great application!

How to use ObjectARX SDK

Once you have downloaded your copy of ObjectARX SDK and

extracted it to your hard drive, you will find the following folders inside

it:

\arxlabs : This directory consists of a set of labs that shows some aspects

of the ObjectARX.

\classmap : This directory contains an AutoCAD drawing with the ObjectARX

class hierarchy tree.

\docs : This directory contains the ObjectARX online help files.

\inc : The inc directory contains the ObjectARX header files.

\lib : The lib directory contains the ObjectARX library files.

\redistrib : This directory contains DLLs that may be required for an

ObjectARX application to run.

\samples : This directory contains examples of ObjectARX applications.

\utils : This directory contains other libraries like brep for boundary

representation and ObjARXWiz for the ObjectARX wizards.

ObjectARX Classes Naming

ObjectARX classes names follow the following prefix standards:

AcRx : Classes for binding an application and for runtime class

registration and identification.

AcEd : Classes for registering native AutoCAD commands and for

AutoCAD event notification.

AcDb : AutoCAD database classes.

AcGi : Graphics classes for rendering AutoCAD entities.

AcGe : Utility classes for common linear algebra and geometric

objects.

Depending on which set of features you use in your applications you

will need to use the corresponding library as follows:

AcRx : acad.lib, rxapi.lib, acdb16.lib

AcEd : acad.lib, rxapi.lib, acedapi.lib, acdb16.lib

objects made to manage objects of the same type. This way we have

appropriate methods and procedures to store entities, layers, text styles,

etc. Each object stored into Database receives an identifier that is called

ObjectId. This identifier is unique inside the same AutoCAD session and

it is valid during the lifecycle of each object. The ObjectId is generated

by its Database and you don't need to worry about how to create it.

 Inside ObjectARX we have basically 3 kind of objects:

 Entities: Objects with graphical representation (lines, arcs,

texts, ...);

 Containers: Special objects to store and manage collections (layer

table, linetype table, ...);

 Objects: Objects without any graphical representation (groups,

layouts, ...)

AutoCAD's Database structure

Creating objects

To create an object through ObjectARX we have some kind of recipe

depending on what type of object it is and where we would like to store it

(most of time we need to store an objects inside its specific container).

Basically, you will follow this sequence:

Declare a pointer to the object type you would like to create and call

its new operator;

With this pointer, call appropriate methods of this object to change its

features;

Get a pointer to the Database where you would like to create the

object (most of time the current Database);

Open the appropriate container where it should be stored;

Call the specific container method to store your object passing its

pointer;

Receive its ObjectId automatically generated by its container;

Finish the operation closing all opened objects including containers

and the object you have just created.

Obviously you will create some handy classes to allow the

automation of this processes because they are very similar and can be

easily reused. The main idea is to create a sort of database utility funcions

like: AddLayer, AddLine, AddCircle, AddTextStyle, etc.

* It is very important to not forget to close opened objects because this will cause

AutoCAD to terminate.

Sample code to create a line (AcDbLine)

This code demonstrates how to create a simple line between two

points. The process is simple and no error check is made. This code needs

to be embedded inside an ObjectARX application structure to work. The

main idea is to show you the concepts. Further we will create a working

剩余63页未读，继续阅读

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内容反馈

wufang_2004

2012-03-13

ObjectARX的一个英文教程，巴西人写的，很好
jeck515

2013-09-24

好东西，就是英文的，有点累。谢谢
ftyuhg

2013-01-26

看了几天，感觉还行吧，很详细的。就是英文的看的费劲了点！！

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