2011

Table Of Contents
Before the drawing is initialized, new definitions for HATCH and OLDHATCH
are defined with the defun function. After the drawing is initialized, the
S::STARTUP function is called and the standard definition of HATCH is
undefined.
NOTE To be appended, the S::STARTUP function must have been defined with
the defun-q function rather than defun.
Because an S::STARTUP function can be defined in many places (an acad.lsp,
acaddoc.lsp, or MNL file or any other AutoLISP file loaded from any of these),
it's possible to overwrite a previously defined S::STARTUP function. The
following example shows one method of ensuring that your startup function
works with other functions.
(defun-q MYSTARTUP ( )
... your startup function ...
)
(setq S::STARTUP (append S::STARTUP MYSTARTUP))
The previous code appends your startup function to that of an existing
S::STARTUP function and then redefines the S::STARTUP function to include
your startup code. This works properly regardless of the prior existence of an
S::STARTUP function.
ObjectARX
ObjectARX technology provides the foundation for design software applications
to share intelligent object data. You can run third-party ObjectARX application
programs or write your own.
Overview of ObjectARX
ObjectARX
®
(AutoCAD Runtime Extension) is a compiled-language
programming environment for developing AutoCAD applications. The
ObjectARX programming environment includes a number of dynamic link
libraries (DLLs) that run in the same address space as AutoCAD and operate
directly with core AutoCAD data structures and code. These libraries take
advantage of the AutoCAD open architecture, providing direct access to the
AutoCAD database structures, graphics system, and AutoCAD geometry engine
to extend AutoCAD classes and capabilities at runtime. Additionally, you can
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