By Bill Kramer
AutoCADet: an individual who makes use of AutoCAD without delay or not directly to create or research photo photographs and is in ownership of 1 or extra of the next qualities: desires to research; has an curiosity in bettering the way in which AutoCAD works; is a visionary AutoCAD consumer; i customise AutoCAD to incorporate productiveness improvements like new instructions, mixtures of current instructions or checklist processing scripts to shop and control info. This educational deals an entire advent to the visible LISP language, surroundings and editor. complicated subject matters comprise info manipulation and programming conversation containers.
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Additional resources for The AutoCADET's Guide to Visual LISP
The (A10) expression starts the A10 function and waits for it to return a result. ) After the A10 function is finished and returns control to A1, the A1 function performs the fourth operation, which is printing the value of A. 3 Defining the A10 function. 3 is essentially the same as the A1 function. The A symbol is defined as a parameter to the function following the slash, which means that it has a NIL value at the start of this function. As the A10 function begins to evaluate the first occurrence of the (print A) expression, after being called from A1 function, the LISP stack of symbols contains two entries that are both named A.
Using the “last in, first out” rule, the (print A) expression uses the value associated with the last entry on the stack, 10. 4. 4 Defining the A100 function. (defun A100 ( / A) (setq A 100) (print A) ) The definition of A100 follows the same lines as the definitions of A1 and A10. A symbol named 38 CHAPTER 3: The Essence of Visual LISP A is defined in the parameter list following a slash. As the (print) expression is evaluated, three entries are on the stack with the value A. Now, if you typed all three of these functions in an editor window of the VLIDE, loaded the three into the console for testing, and typed the (A1) expression, the following output would appear.
Even though you may have tested your program thoroughly, errors will occur. You need to set up a path for the system to follow when a problem occurs in the evaluation of your application. To do this, you use the *ERROR* symbol as a function in your program code. Visual LISP starts the *ERROR* function when an error occurs in the evaluation of the code. The type of error is supplied as a string argument to the function. You have the opportunity to save your global variables from the local variables because the function is running within the scope of the function that caused the error.
The AutoCADET's Guide to Visual LISP by Bill Kramer