AutoCAD 2026

https://help.autodesk.com/view/ACD/2026/ENU
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### Obtain start parameter of spline

Source: https://help.autodesk.com/view/ACD/2026/ENU/?guid=GUID-E1C78CD1-2347-4A2B-B054-62149738F9A6

Example using vlax-curve-getStartParam to get the start parameter of a spline object. The output is 0.0.

```lisp
(setq startSpline (vlax-curve-getStartParam splineObj))
0.0
```

--------------------------------

### Sample startup script (_setup.scr)

Source: https://help.autodesk.com/view/ACD/2026/ENU/?guid=GUID-5510017F-4656-478F-BD4C-AB6B1998BF55

This script turns on the grid, sets the global linetype scale to 3.0, and sets layer 0 as current with red color. The blank fourth line ends the LAYER command.

```AutoLISP
grid on 
ltscale 3.0 
layer set 0 color red 0

```

--------------------------------

### Example: get start parameter of an ellipse

Source: https://help.autodesk.com/view/ACD/2026/ENU/?guid=GUID-854C3C4D-1305-4920-9E42-D9ACB9E4363C

Example call to vlax-curve-getstartparam on an ellipse object, returning 0.0. Assumes ellipseObj points to the ellipse shown in the example for vlax-curve-getArea.

```lisp
(vlax-curve-getstartparam ellipseObj)
0.0
```

--------------------------------

### vlax-user-product-key example output

Source: https://help.autodesk.com/view/ACD/2026/ENU/?guid=GUID-42C8BADD-C5BC-4913-A8AF-ECF2ADF42FB6

Example call and its returned registry path string.

```lisp
(vlax-user-product-key)
"Software\\Autodesk\\AutoCAD\\R25.1\\ACAD-9101:409"
```

--------------------------------

### Get start point of an ellipse

Source: https://help.autodesk.com/view/ACD/2026/ENU/?guid=GUID-AA1C450F-AA6E-4B05-AFB3-989AD91ADBFC

Example call to vlax-curve-getStartPoint with an ellipse object, returning the start point (2.0 2.0 0.0). For an ellipse, start and end points are the same.

```lisp
(vlax-curve-getStartPoint ellipseObj)
(2.0 2.0 0.0)
```

--------------------------------

### vlax-product-key example with output

Source: https://help.autodesk.com/view/ACD/2026/ENU/?guid=GUID-237CEDFA-A02E-443E-BB21-5BD86E5E353E

Example call to vlax-product-key and the returned registry path string.

```lisp
(vlax-product-key)
```

```text
"Software\\Autodesk\\AutoCAD\\R25.1\\ACAD-9101:409"
```

--------------------------------

### Get point at midpoint parameter

Source: https://help.autodesk.com/view/ACD/2026/ENU/?guid=GUID-B506C696-DBDA-466B-9EF8-1AF3B1A485F8

Example that calculates the parameter midway between the start and end parameters and calls vlax-curve-getPointAtParam to get the point. The output is (6.71386 2.82748 0.0).

```lisp
(vlax-curve-getPointAtParam splineObj
   ( / (- endspline startspline) 2))
(6.71386 2.82748 0.0)
```

--------------------------------

### vlax-machine-product-key example

Source: https://help.autodesk.com/view/ACD/2026/ENU/?guid=GUID-2EB68815-FDF9-4235-918B-025FB9A42220

Example call and its return value showing the registry path.

```lisp
(vlax-machine-product-key)
"Software\\Autodesk\\AutoCAD\\R25.1\\ACAD-9101:409"
```

--------------------------------

### Define and call a function with defun-q

Source: https://help.autodesk.com/view/ACD/2026/ENU/?guid=GUID-5EE138EF-D531-441B-9F12-8D5645C540FE

Defines a function named my-startup that takes an argument x and prints a list containing x. The example shows the function definition, the returned symbol MY-STARTUP, and the output when calling (my-startup 5).

```AutoLISP
(defun-q my-startup (x) (print (list x)))
MY-STARTUP

(my-startup 5)
(5) (5)
```

--------------------------------

### Get start point of a spline

Source: https://help.autodesk.com/view/ACD/2026/ENU/?guid=GUID-AA1C450F-AA6E-4B05-AFB3-989AD91ADBFC

Example call to vlax-curve-getStartPoint with a spline object, returning the start point (1.73962 2.12561 0.0). This spline is used to demonstrate vlax-curve-getDistAtParam.

```lisp
(vlax-curve-getStartPoint splineObj)
(1.73962 2.12561 0.0)
```

--------------------------------

### vl-mkdir example on Windows

Source: https://help.autodesk.com/view/ACD/2026/ENU/?guid=GUID-02D5CC9E-9394-4630-AE14-133F5F03D7B1

Example of creating a directory on Windows using a backslash path. Returns T on success.

```lisp
(vl-mkdir "c:\\mydirectory")
T
```

--------------------------------

### Retrieve root AutoCAD object pointer

Source: https://help.autodesk.com/view/ACD/2026/ENU/?guid=GUID-B3F22E35-4666-452F-89C8-5BC15B9E9463

Starts the example workflow by getting a pointer to the root AutoCAD object using vlax-get-acad-object. The output shows the returned VLA-OBJECT.

```lisp
(setq acadObject (vlax-get-acad-object))
#<VLA-OBJECT IAcadApplication 00a4b2b4>
```

--------------------------------

### Example: Get lower bound of second dimension

Source: https://help.autodesk.com/view/ACD/2026/ENU/?guid=GUID-8ABBA8A8-D421-48D2-BCBC-34DA1C728A78

Calls vlax-safearray-get-l-bound on the array tmatrix with dimension 2. The output is 0, indicating the second dimension starts at index 0.

```lisp
(vlax-safearray-get-l-bound tmatrix 2)
0
```

--------------------------------

### vl-load-all Windows Examples

Source: https://help.autodesk.com/view/ACD/2026/ENU/?guid=GUID-116F4D02-4B1A-4298-B38C-5B38FD982867

Examples of using vl-load-all on Windows. The first loads a file with a full path, the second loads a file from the support search path. Both return nil on success.

```lisp
(vl-load-all "c:/my documents/visual lisp/examples/whichns.lsp")
nil

(vl-load-all "yinyang.lsp")
nil
```

--------------------------------

### Example: Get lower bound of first dimension

Source: https://help.autodesk.com/view/ACD/2026/ENU/?guid=GUID-8ABBA8A8-D421-48D2-BCBC-34DA1C728A78

Calls vlax-safearray-get-l-bound on the array tmatrix with dimension 1. The output is 1, indicating the first dimension starts at index 1.

```lisp
(vlax-safearray-get-l-bound tmatrix 1)
1
```

--------------------------------

### layoutlist example with output

Source: https://help.autodesk.com/view/ACD/2026/ENU/?guid=GUID-AE3F338F-0B11-45B0-AB12-2C119203A977

Example call to layoutlist and its return value, a list of layout names.

```lisp
(layoutlist)
("Layout1" "Layout2")
```

--------------------------------

### vl-mkdir example on Mac OS and Web

Source: https://help.autodesk.com/view/ACD/2026/ENU/?guid=GUID-02D5CC9E-9394-4630-AE14-133F5F03D7B1

Example of creating a directory on Mac OS and Web using a forward slash path. Returns T on success.

```lisp
(vl-mkdir "/mydirectory")
T
```
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