ErrNo Variable Issue

Hello,

Odd behavior concerning errno variable and UCS command:

(setvar 'errno 0)

Using "UCS" command, rotate UCS to OBject, selecting nothing:

(getvar 'errno)

...returns 2, as expected.

But with lisp:

(setvar 'errno 0)
 (command "ucs" "ob" pause)

Select nothing, and errno returns 0 still.

Any idea why one would act as expected and the other not?

my test R17 (2007) both return 0

in 2015 both set errno to 2

Command: (setvar 'errno 0)

0

Command: (command "ucs" "ob" pause)

No object found

nil

Command: (getvar 'errno)

2

weird...

Thanks for checking han and Jef!

I am on 2016, and it consistently returns 2 when issuing command, and 0 through lisp.

Thanks for checking han and Jef!

I am on 2016, and it consistently returns 2 when issuing command, and 0 through lisp.

if this is a bug in different versions (yours 2016 Jef's 2015 ,2007) etc.. not sure entsel?

I found setting ucs by entity to be somewhat unpredictable.

For instance, setting ucs to a line, the ucs will be different depending where on that line you pick.

Gets even more unpredictable on a polyline or solid.

Thanks for checking han and Jef!

You're welcome!

I found setting ucs by entity to be somewhat unpredictable.

I havn't study UCS "object" in depth, but my feeling is that (well, for the machine) it is probably more arbitrary than unpredictable. (like the orientation of the X and Y axes of an OCS, or what part of a 3DSolid will keep the original handle/ename after you slice it in 2, etc).

Hey Jef!

You are probably right on that.