Free Programming Autocad Using Objectarx Programs

ObjectARX (AutoCAD Runtime eXtension) is an API for customizing and extending AutoCAD. The ObjectARX SDK is published by Autodesk and freely available under license from Autodesk.^[1] The ObjectARX SDK consists primarily of C++ headers and libraries that can be used to build Windows DLLs that can be loaded into the AutoCAD process and interact directly with the AutoCAD application. ObjectARX modules use the file extensions .arx and .dbx instead of the more common .dll.

First you should know at least one of these programming languages, C#/VB.NET, or C or LISP. AutoCAD SDK ObjectARX is available in above mentioned languages. Next, you need to download SDK from ObjectARX- AutoCAD API Programming Environment. Programming AutoCAD in ObjectARX by Charles McAuley, 436, available at Book Depository with free delivery worldwide. Programming AutoCAD in ObjectARX: Charles McAuley: 436 We use cookies to give you the best possible experience.

ObjectARX is the most powerful of the various AutoCAD APIs, and the most difficult to master. The typical audience for the ObjectARX SDK includes professional programmers working either as commercial application developers or as in-house developers at companies using AutoCAD.

New versions of the ObjectARX SDK are released with each new AutoCAD release, and ObjectARX modules built with a specific SDK version are typically limited to running inside the corresponding version of AutoCAD. Recent versions of the ObjectARX SDK include support for the .NET platform by providing managed wrapper classes for native objects and functions.

The native classes and libraries that are made available via the ObjectARX API are also used internally by the AutoCAD code. As a result of this tight linkage with AutoCAD itself, the libraries are very compiler specific, and work only with the same compiler that Autodesk uses to build AutoCAD. Historically, this has required ObjectARX developers to use various versions of Microsoft Visual Studio, with different versions of the SDK requiring different versions of Visual Studio.

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Although ObjectARX is specific to AutoCAD, Open Design Alliance announced in 2008^[2] a new API called DRX (included in their DWGdirect library) that attempts to emulate the ObjectARX API in products like IntelliCAD that use the DWGdirect libraries.

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Expand your customization skills as you program a command using Visual Studio.NET.

In my previous articles about AutoCAD programming, we learned how to use the .NET programming environment to extract drawing information, create and modify AutoCAD entities, and modify entities programmatically. We primarily focused on running applications from the .NET environment, accessing AutoCAD with component object model (COM) interoperability. In a nutshell, this means we were using both .NET and COM technologies to manipulate AutoCAD in ways similar to those of the built-in VBA environment of years past.
In this article, we will create an AutoCAD plugin, a custom command that can be run directly from the AutoCAD environment. We will focus on .NET techniques, introducing a new concept called Transactions to create AutoCAD entities programmatically. Specifically, we will develop a custom command that creates a circle object and some accompanying text in one fell swoop.
As before, this example uses the Visual Basic.NET programming environment, although you can use Visual C#.NET instead. To complete this exercise, you'll need either Visual Studio.NET or the free Visual Studio Express. Wolfgang dj controller driver download. (If you're using AutoCAD 2013, you should also download the ObjectARX software development kit [SDK] to run this example. Even though it's not an ObjectARX example, the necessary references are located in the SDK for 2013.)

Create a Plugin

1. Start Visual Studio and create a new project by clicking File > New > Project.
2. In the New Project dialog box, select Class Library, then type a name and file location at the bottom of the box, as shown here.
   
3. Click OK to close the New Project dialog box.
4. Click View > Solution Explorer to display the Solution Explorer.
5. Double-click on My Project in the Solution Explorer; the Project Properties screen will appear.
6. Click the References tab on the left.
7. Click the Add button to display the Add Reference dialog box.
8. In the Add Reference dialog box, click the Browse tab, and navigate to where your AutoCAD DLL files are located. If you downloaded the ObjectARX SDK, they are likely located in the ObjectARX 2013inc-win32 or ObjectARX 2013inc-win64 folder, depending on which version of AutoCAD you are using. Select the AcCoreMgd.dll, AcDbMgd.dll, and AcMgd.dll files by clicking on one and Ctrl-clicking on the others. (Note: This example is for AutoCAD 2013. If you are using another version, you can download the ObjectARX SDK for that version and reference the DLL files listed earlier.)
9. Click OK to close the Add Reference dialog box.
10. In the Properties window, change the Copy Local properties of the three DLL files to False.
11. In Solution Explorer, rename the class from Class1 to CreateMyCircle.
12. Double-click on the CreateMyCircle.vb file, and modify the code to read as shown below. (Hint: You can copy and paste the code instead of retyping it!)
    Imports Autodesk.AutoCAD.Runtime
    Imports Autodesk.AutoCAD.Geometry
    Imports Autodesk.AutoCAD.DatabaseServices
    Imports Autodesk.AutoCAD.ApplicationServices
    Public Class CreateEntities
    Private Shared myroutine As Action
    <CommandMethod('CreateMyCircle')>
    Public Sub CreateEntities()
    Dim acDoc As Document =
    Application.DocumentManager.MdiActiveDocument
    Dim acDb As Database = acDoc.Database
    Dim acBlkTbl As BlockTable
    Dim acBlkTblRec As BlockTableRecord
    Dim acCirc As Circle = New Circle()
    Dim acText As MText = New MText()
    ' Start a transaction
    Using acTrans As Transaction =
    acDb.TransactionManager.StartTransaction()
    acBlkTbl = acTrans.GetObject(acDb.BlockTableId,
    OpenMode.ForRead)
    acBlkTblRec =
    acTrans.GetObject
    (acBlkTbl(BlockTableRecord.ModelSpace), _
    OpenMode.ForWrite)
    ' Create a circle with a center point located at
    0,2,0 and a radius of 4.0.
    acCirc.SetDatabaseDefaults()
    acCirc.Center = New Point3d(0, 2, 0)
    acCirc.Radius = 4.0
    acText.Location = acCirc.Center
    acText.TextHeight = 1
    acText.Contents = 'Text starts at center point.'
    acBlkTblRec.AppendEntity(acCirc)
    acTrans.AddNewlyCreatedDBObject(acCirc, True)
    acBlkTblRec.AppendEntity(acText)
    acTrans.AddNewlyCreatedDBObject(acText, True)
    acTrans.Commit()
    End Using
    End Sub
    End Class
    
13. Save your work by clicking File > Save All.
14. Build the application by clicking Build > Build MyCircleCommand. If you receive any error messages, Visual Studio provides guidance in the Output window about where the errors occurred and what the fix might be. The figure below shows the results of a typographical error in the Imports statement.