want to know more about vlisp

[LauKwokFai]

I happened to learned autolisp many years ago, because I don't have much knowledge about computer programming, after all these years I am now able to write quite a bit of autolisps to help my drafting speed. Suddenly I found this Vlisp, it is just a big headache to me, I have no idea where to start or what it is going on. Can someone give me some sort of basic introduction...start from basic, I would like to know what is the different between "vl-" "vla-" and "vlr-", do they stand for something ? or what....

 

Many thanks !!!

[JohnM]

VL = visual lisp: these are functions that where added to autolisp by AutoCAD to get deeper into the AutoCAD application

VLR = Visual lisp reactor: reactors are functions that react to different events and allow the programmer to respond to the event. Example: a object reactor can be attached to a line and written to perform a function like display the lines length if the line is changed.

VLA= Visual lisp application: this is an interface between autolisp and visual basics. This allows the programmer to access visual basic functions from autolisp and gain even more control over the AutoCAD application.

If you bring up the apropos window in the autolisp environment you can type a word like polyline and a list will be displayed then you can see if a vla- function is abalibel.

Using the vla-function takes a little learning curve but can be of great help

Read the autolisp help files and a lot of this is explained

[LauKwokFai]

thanks so much...still sounds complicated to me, I would try to follow this direction to look. Is there any good books for beginner you can suggest ? You may not believe this, I cannot find one single book in any bookstore about autolisp or vlisp in my city !!

[StevJ]

Here's an online reference manual you might find helpful.

http://midpointcad.com/au/docs/lakose_The_Visual_LISP_Developers_Bible.pdf

 

Steve

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[LauKwokFai]

thank you so much Steve !!!