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怎样用arx扩展lisp
怎样用arx扩展lisp
请教王咣生版主和其他版主、网友，我想学习arx来扩展lisp的函数，就像doslib那样。因为在vlisp中自定义的函数不能亮显，很不方便，我想能不能用arx编了后加载来用。比如下面的函数：
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请说明一下用arx来实现的全过程，万分感谢！！！
cad二次开发
qq：460470806
email：tukuitk@sohu.com
用arx的向导生成工程，搞明白acedgetargs然后你就会了
不明白怎么弄，虫虫兄能指教一下吗，我今天才下载了库函数，昨天才把c++的前三章看完，知道了函数，接下来才该看指针（听说很难的），唉，革命还早哟……
cad二次开发
qq：460470806
email：tukuitk@sohu.com
acedgetargs global function
struct resbuf *
acedgetargs();
retrieves arguments to requested external function.
returns a pointer to a linked list of the arguments that autolisp has passed to the arx application through an kinvksubrmsg message. the acedgetargs() function retrieves these arguments, allocates result buffers, and places the argument values in these result buffers. if autolisp has not passed any arguments to the application, acedgetargs() returns a null pointer.
after calling acedgetargs(), the arx application can traverse the result-buffer list to retrieve and use the function arguments.
note in release 14, entity data lists were treated specially by ads_getargs(). for an entity data list, the linked list of resbuf structures returned by ads_getargs() had no resbuf with type code rtlb at the head of the list and matching resbuf with type code rtle at the end of the list to act as a bracketing "wrapper" pair indicating that the data was all within a single list. if the list was not an entity data list, then when a list was passed to objectarx, ads_getargs() returned a resbuf chain with a "wrapper" rtlb/rtle pair.
this special treatment of entity data lists was not desirable - all lists should be treated the same by ads_getargs() (now acedgetargs()) and ads_retlist() (now acedretlist()).
another problem with the way release 14 treated lists was that ads_retlist() always added an rtlb/rtle "wrapper" pair. when passing a list back and forth between autolisp and objectarx, this caused the list to be repeatedly nested one level deeper in a set of nested lists. for example, if (list "a" "b") was passed to objectarx from autolisp, then returned to autolisp, then passed to objectarx, then returned to autolisp, the result would have been:
((("a" "b")))
but the original was simply:
("a" "b")
in autocad
看不懂……
cad二次开发
qq：460470806
email：tukuitk@sohu.com