Topic: command / vl-cmdf

[Andrea]

ok all..

a good one...

why when i use this is not working ?
(vl-cmdf "_insert" "test.dwg" ^c)

I need to use the "command" line option to get it work.
(command "_insert" "test.dwg" ^c)

just curious..

[Jeff_M]

"The arguments to the vl-cmdf function can be strings, reals, integers, or points, as expected by the prompt sequence of the executed command. A null string ("") is equivalent to pressing ENTER on the keyboard. Invoking vl-cmdf with no argument is equivalent to pressing ESC and cancels most AutoCAD commands. "

So that means this will work:

Code: [Select]


(vl-cmdf "_insert" "c:/test1.dwg")
(vl-cmdf)


BTW, you do know there is a seperate forum for lisp type queries?

[Mark]

Yep! there is forum for lisp type questions.

[SMadsen]

Andrea, just to elaborate a bit: the ^C you put at the end has no special meaning. It's just seen as a symbol that happens to evaluate to nil. Instead you should use nil in the COMMAND call.

The difference you experience is caused by the fact that VL-CMDF evaluates all arguments before passing them to the command interpreter. Verifying the entire package of arguments before executing the command is what makes VL-CMDF capable of returning T on success.
COMMAND on the other hand simply shoves arguments into the command interpreter while the command is being executed.

When VL-CMDF sees a nil value (e.g. in the form of the symbol ^C), it says 'this is a no go' and stops before the command is sent.

[Andrea]

Andrea, just to elaborate a bit: the ^C you put at the end has no special meaning. It's just seen as a symbol that happens to evaluate to nil. Instead you should use nil in the COMMAND call.

The difference you experience is caused by the fact that VL-CMDF evaluates all arguments before passing them to the command interpreter. Verifying the entire package of arguments before executing the command is what makes VL-CMDF capable of returning T on success.
COMMAND on the other hand simply shoves arguments into the command interpreter while the command is being executed.

When VL-CMDF sees a nil value (e.g. in the form of the symbol ^C), it says 'this is a no go' and stops before the command is sent.

OH !!  I see now...
thank you all.
i appreciate all your help.