Part VII Programming AutoCAD in .NET

Printer UPC Symbol in .NET Part VII Programming AutoCAD
Part VII Programming AutoCAD
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AutoCAD automatically loads four AutoLISP files. Two files, acad2000.lsp and acad2000doc.lsp, are specific to AutoCAD 2002. AutoCAD recommends that you reserve these files for Autodesk use. Acad2000.lsp is loaded only once per AutoCAD session when you first load AutoCAD, while acad2000doc.lsp is loaded in the initial session and then each time a drawing is opened. The other two automatically loaded AutoLISP files are reserved for you, the user. These files are acad.lsp, which is loaded once per AutoCAD session, and acaddoc.lsp, which is loaded every time a drawing is opened. What this means to you is that you can place different initialization routines in each file one for AutoCAD initialization (acad.lsp) and the other for the initial drawing as well as future drawings. You can place an S::STARTUP function in both acad.lsp and acaddoc.lsp. However, be aware that placing different S::STARTUP functions in both files effectively disables the S::STARTUP function defined in acad.lsp. You must create both acad.lsp and acaddoc.lsp. However, once you create any AutoLISP routine and save it under either name, you can add additional routines to the same file. AutoCAD 2002 knows to automatically load these files, as long as they exist. The load order of these initialization files is:
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1. Acad2000.lsp: Loaded by AutoCAD 2002 2. Acad.lsp: User-defined initialization file loaded once upon loading AutoCAD 2002 3. Acad2000doc.lsp: Document-level initialization file loaded by AutoCAD 2002 4. Acaddoc.lsp: User-defined document-level initialization file
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Here s an AutoLISP routine that uses both DEFUN and COMMAND:
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(defun c:redline (/ startpt endpt) (terpri) (setq startpt (getpoint Select the redline start point: )) (terpri) (setq endpt (getpoint Select the redline end point: )) (command _line startpt endpt ) (command _chprop _last _color red ) )
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Here s an explanation of this routine: The first line of this routine defines a function called redline. Because redline is preceded by c:, you can type redline at the command line when using it within AutoCAD. As you may remember from the discussion of the circle3 routine, the expression (/ startpt endpt) means that redline has two local variables that are available only to this routine. These variables are used in the next two lines.
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35 Exploring AutoLISP Further
The new instruction, terpri, on the second and fourth lines tells AutoCAD to print a blank line at the command line. You can use this to improve readability of the prompts. Otherwise, two or more prompts run together on one line. Reading the third line from the innermost parenthesis pair outward, AutoCAD obtains the redline s start point from the user with the prompt Select the redline start point: and sets the variable startpt equal to that start point s value. Similarly, the fifth line obtains the redline s endpoint and sets the variable endpt to that value. Line 6 uses the AutoLISP COMMAND function. It issues the LINE command, specifies the start and endpoints, and uses a set of empty quotation marks to replicate pressing Enter to end the LINE command. Line seven analogously uses the same syntax for the CHPROP command. It issues the CHPROP command, selects the line you just used by using the Last selection option, ends object selection by using the empty set of quotation marks, specifies the Color option, and sets the color to red. Another empty set of quotation marks ends the command. Line 8 ends the redline routine with a closing parenthesis. To use this routine, you would follow these steps: 1. Open Visual LISP and start a new file. 2. Type the routine. 3. Save the routine as redline.lsp and place it in AutoCAD s Support folder or any other folder you may have created for AutoLISP routines and added to AutoCAD s support file search path. 4. Load the routine. 5. Switch to AutoCAD. 6. At the command prompt, type redline . 7. In response to the prompts for the start point and endpoint of the redline, choose any two points onscreen. AutoCAD draws a red line between the two points selected.
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