在arx中能够改变autolisp变量的值吗？

leemanzhuo

在arx中能够改变autolisp变量的值吗？

XDSoft

可以，写ADSRX的程序，既通过ADS_DEFUN来定义外部函数（命令）中，通过ads_putsym,见下面：

int
acedPutSym(
    const char* sname,

    struct resbuf* value);

Include File

acedads.h

Sets the value of an AutoLISP symbol.
Warning This command can be used in the ARX program environment only when AutoCAD sends the message kInvkSubrMsg to the application.
The sname argument specifies the symbol name. The value argument is a pointer to a result-buffer list that specifies the value of the symbol. The list must contain values of types that can be represented in AutoLISP; if it doesn't, the acedPutSym() call fails. To set the value of the AutoLISP symbol to nil, make the following assignment:

value->restype = RTNIL;

If sname is not the name of a current symbol, acedPutSym() creates a new AutoLISP symbol with this name and assigns it the value.
Note An acedPutSym() function call can create a new AutoLISP symbol that AutoLISP cannot access--for example, by including illegal characters in the symbol name, such as "pair(s". An acedGetSym() call can access such symbols, but they will cause an error in a future upgrade or release of AutoCAD. Your programs should not rely on this capability.

The acedPutSym() function returns RTNORM if it succeeds; otherwise, it returns RTERROR. When acedPutSym() fails, it sets the system variable ERRNO to a value that indicates the reason for the failure.

XDSoft

如果你要在使用addCommand方法定义的ARX命令（纯ARX）不能用上面的方法，你可以用论坛介绍过的往ACAD命令行发字符串的方法，设置变量。

比如把"(setq 变量名 值)"发送到命令行，让ACAD的LISP解释执行。

发送的方法搜索下论坛，有好几种方法。