OpenDCL_Tutorial

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OpenDCL Tutorial: DCL Has Evolved!

Barry Ralphs

Introduction: I know what you’re thinking: "Why learn OpenDCL when there's VBA and .NET?" If you

haven’t already heard, VBA isn’t going to be around much longer and do you really want to port your

hundreds of Lisp routines to .NET? This tutorial will introduce you to the basics of OpenDCL and its abilities.

We’ll discuss how to easily design stunning GUIs (Graphical User Interfaces) for your Lisp routines, and we’ll

also cover advanced topics, such as securely embedding your UI into a VLX file for public distribution. You

should have general AutoCAD® and AutoLISP® knowledge.

About the Author:

Barry Ralphs is currently the CAD manager for Tipping Mar & Associates, a structural engineering firm in

Berkeley, CA. Prior to his current position, he spent nearly six years as the CAD manager for ARUP Los

Angeles. Barry has been customizing AutoCAD® with OpenDCL and its predecessor ObjectDCL, since its

introduction in 2001. He is the webmaster for OpenDCL.com, has written a number of the sample projects

that install with OpenDCL Studio. He is also one of the lead beta testers for the project. You can usually find

him in the OpenDCL support forums helping out other newcomers to the project under the username

"BazzaCAD".

barry.ralphs@gmail.com

OpenDCL Tutorial: DCL Has Evolved!

Getting started with OpenDCL

The first thing you’ll need to do is visit the OpenDCL.com website and click the “Download” link

on the sidebar of the page. You’ll then be taken to the download page on SourceForge.net for

the OpenDCL project. Under the list of Packages to download, select “OpenDCL Studio”. At

this point you won’t need to download the “Runtime” as it will be installed with the “Studio”. Now

under the list of Filenames, select your preferred language code to download, English (ENU),

German (DEU), Chinese (CHS), Spanish (ESM), and French (FRA). After the download is

complete, just run the MSI file and it will be installed in less than 1 minute.

You should now have an “OpenDCL Studio” icon on your desktop; double click it now

to launch it. See the image below for more information about the Studio workspace.

OpenDCL Tutorial: DCL Has Evolved!

Now is a good time to see what OpenDCL [ODCL] can do. The Studio installs a number of

samples that demonstrate its capabilities. Open Windows Explorer and browse to “C:\Program

Files\OpenDCL Studio\ENU\Samples”. This is the typical install location for the English version

of ODCL on a Windows 32 bit OS. Drag the “_MasterDemo.lsp” file into your AutoCAD drawing

window.

This will display a Docked Control Bar form

with a number of buttons. Each button will

launch a different example. Click through

each of the samples, to see what ODCL can

do. After exploring the sample projects,

you're ready to start your first project with

OpenDCL.

Basic Level 1: Creating your first “Hello World” project.

In OpenDCL Studio, pick “Add Modal Dialog” from the main toolbar or the “Project” pull-down.

A new form will appear in the editing area. The form's grid is provided as an aid to positioning

controls. You can set the spacing of the grid by selecting the Tools menu > Grid Spacing. You

can also choose not to display it at all by setting the spacing to 0.

OpenDCL Tutorial: DCL Has Evolved!

For this example resize the form by dragging the bottom right border, or by changing the

“Height” & “Width” in the Properties Panel to 80 & 250.

Now place a “Label” and a “Text Button” on the

form by clicking their buttons on the Control Panel

Toolbox, then dragging a rectangle out on the

form’s surface.

Change the “Caption” property of the button to

“OK”. The form should now look similar to this:

Save the project file as “HelloWorld.odcl” to an AutoCAD support directory or another directory

of your choice that is in AutoCAD's search path.

If AutoCAD isn’t already running, go ahead and launch it now and open the Visual LISP editor

(type VLIDE at the command line). Create a new LISP file and save it as “HelloWorld.lsp” in the

same location as the project file (in the AutoCAD search path). Type out or copy and paste the

code below into the new file.

; Ensure the appropriate OpenDCL ARX file is loaded

(command "OPENDCL")

(defun c:Hello ()

; call the method to load the HelloWorld.odcl file.

(dcl_Project_Load "HelloWorld" T)

; call the method to show the Hello World dialog box example

(dcl_Form_Show HelloWorld_Form1)

(princ)

)

Now save the LSP file and load it into AutoCAD by hitting CTRL+ALT+E. You can now run

your command by typing HELLO at the command line. The new dialog should pop open and

look the same as it did in the ODCL Studio. Note that nothing happens when you try to click on

the OK button. This is because the OK button hasn’t been assigned an Event yet. Also, note

that while this dialog is open, you can’t interact with AutoCAD. This is called a “Modal Dialog”,

as that’s the type of dialog we chose when we created it. To close the dialog, click the red X in

the upper right corner.

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OpenDCLTutorial:DCLHasEvolved!BarryRalphsIntroduction:Iknowwhatyou’rethinking:"WhylearnOpenDCLwhenthere'sVBAand.NET?"Ifyouhaven’talreadyheard,VBAisn’tgoingtobearoundmuchlongeranddoyoureallywanttoportyourhundredsofLisproutinesto.NET?ThistutorialwillintroduceyoutothebasicsofOpenDCLanditsabilities.We’l...

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