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After launching the application, the version that is listed inside of the application descriptor XML file should be displayed in the Label instance that is in the top-left corner of the application. Now that you are successfully tracking the version of the application, you need to implement a system for finding out what the most current version of the application is. To do this, you need to place some information about the latest version of the application on a Web server so that you can easily update the information and the application can easily fetch it. An example of this would be to create an XML document named version.xml. Listing 22.3 shows how this file might be structured.

(0.0 0.0 0.0)

As you can see, this is very similar to the small routine developed in AutoLISP earlier in this chapter.

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1. To start a new drawing session, close AutoCAD if it is open. Open AutoCAD. 2. Start a new drawing using the Start from Scratch option. 3. Draw any line. Neither the start point nor the endpoint should be 0,0,0. 4. Choose Tools AutoLISP Visual LISP Editor. 5. In the Console window, type (vl-load-com) to load the ActiveX functions. 6. To convert the entity name into a vla-object, type (setq vla-line (vlax-ename>vla-object (entlast))) . 7. To view the line s properties, type (vlax-dump-object vla-line) . 8. To get the start point of the line, type (setq Starting (vla-get-startpoint vla-line)) . 9. To convert the start point from the variant data type to coordinate format, type (safearray-value (vlax-variant-value Starting)) . 10. To change the line s start point to 0,0,0, type (vla-put-startpoint vla-line (vlax-3d-point '(0 0 0 ))) . 11. Choose Activate AutoCAD on the Visual LISP View toolbar to check out the line. Its start point is now 0,0,0.

< xml version= 1.0 encoding= utf-8 > <application xmlns= http://ns.adobe.com/air/application/1.0 > <!-- The latest version of the application. --> <version>2.0</version> <!-- The URL in which the latest version of the application <! - can be aquired. --> <url>http://www.airbible.org/examples/updater/UpdaterApp.air</url> </application>

This section looks at object creation functions. When you work with ActiveX you need to retrieve objects in their hierarchical order. This hierarchy concept is discussed in more detail in the next chapter. For this chapter, you need to know that before you can retrieve an object, you need to retrieve the following: Acad-object: Represents the AutoCAD application. ActiveDocument: Represents your drawing. ModelSpace/PaperSpace: Represents the type of space you want to use within the AutoCAD application.

The past practice of excessively notching oor or roof joists into carrying members must be reviewed by the structural engineer using the end-notched beam formulae presented in various timber design manuals and textbooks.8

In AutoLISP, you first retrieve the space (model or paper), then your drawing, and finally the AutoCAD application. Here you take the simple line command used earlier in this chapter and convert it using ActiveX:

;;; This function creates a line using Visual LISP ;;; ActiveX and returns the line object as a vla-object. (defun ax-make-aLine () (vla-AddLine (vla-get-ModelSpace ; retrieve the model ; space object (vla-get-ActiveDocument ; get the current ; active document (vlax-get-acad-object) ; get the acad object ) ) (vlax-3d-point (5 5 0)) ; starting point (vlax-3d-point (15 5 0)) ; ending point ) )

The document is very simple, yet it contains everything you need to know to successfully detect and get the latest version. Inside your application, you can now load this document and compare its version to the application s version, as shown in Listing 22.4.

You can type this in the Visual LISP Editor and load it. To try it out, type the following in the Console:

(ax-make-aLine)

Visual LISP responds with the following:

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