undo

i have made acode which selects some objects then run a command on them one
by one but when i undo autocad undoe those commands one by one, i have tried
undo-begin and undo-end but still same result, is there another way or i'm
using it wrong, but in general autocad too issuing : undo-begin,
....commands..., undo-end , still typing u undoe those commands one by one.
martin

 

Look at the MARK option for the UNDO command. Type "UNDO" at the
command line to see what I'm talking about.


bobb

 

Look at the BACK option as well . . . .


bobb

 

Don't use Undo, Mark. A programmer should not use that option.

Undo, Begin and End are the correct ones. But in order to be effective, you
need an error handler also.

Simple example:

(defun C:Test (/ *Error*)
(defun *Error* (msg) ; localized error handler, echo *no* messages
(command "._Undo" "_End")
(command "._U")
(princ))
(command "._Undo" "_End") ; end any open undo group
(command "._Undo" "_BEgin") ; start new group
(command "._Line" pause pause "")
(command "._Circle" pause pause)
(command "._Undo" "_End")
(princ))


--
R. Robert Bell, MCSE
www.AcadX.com


| i have made acode which selects some objects then run a command on them
one
| by one but when i undo autocad undoe those commands one by one, i have
tried
| undo-begin and undo-end but still same result, is there another way or i'm
| using it wrong, but in general autocad too issuing : undo-begin,
| ...commands..., undo-end , still typing u undoe those commands one by
one.
| martin
|
|

 

Umm, Why is this bad?


bobb

 

Bob,
When I am drafting, and I want to try something that may not
work out, I sometimes set a mark. If I like what I've done
I don't back up. If I see it heading nowhere, I can get back
to the branch point in one undo back.
If I had written a program that placed undo marks evertime
I used it, rather than undo begin and ends, then it would
short eliminate the unique benefits of the mark and back
approach.
With undo begin and end, the program can give the user 1
or more incremental undo steps that make sense. This
avoids the user having an unknown number of undo's to
undo the effect of the user created command.

Hope that helps.

Regards,
Doug

 

Thanks for an interesting discussion, now you've got me thinking...

When I put something like:

^C^CUNDO;M;-XR;D;*;-LAYER;U;*;ON;*;T;*;S;0;;REGEN;BlockLay;AUDIT;Y;PURGE;A;;
N;PURGE;A;;N;PURGE;A;;N;PURGE;A;;N;LayChk;

on a custom button, should I be using BEGIN and END? Would it be possible?
If so how?

 

Robert,
Thanks for the tip about using undo end before undo begin.
Things are working better now.

Bill

 

Glad to have helped.


--
R. Robert Bell, MCSE
www.AcadX.com


| Robert,
| Thanks for the tip about using undo end before undo begin.
| Things are working better now.
| Bill
|

 

Thanks!

In short it's: UNDO MARK followed by a few operations

which means I can type UNDO BACK to undo everything the button did.

I'm hoping that this BEGIN END business would put all the button's actions
under one entry in AutoCAD's undo list, so that just pressing the undo
button would work, instead of having to remember to type UNDO BACK.

....Well, writing that made me think clearer and I went back to the help
files and now the new headache looks like this:

^C^CUNDO;BE;-XR;D;*;-LAYER;U;*;ON;*;T;*;S;0;;REGEN;BlockLay;AUDIT;Y;PURGE;A;
;N;PURGE;A;;N;PURGE;A;;N;PURGE;A;;N;UNDO;E;LayChk;

and it works!

So thanks again Doug

 

Now your next headache to is make sure it uses AutoCAD's internal commands,
and works in any language version of AutoCAD (something every menu macro
should do).

Next! ;-)

--
R. Robert Bell, MCSE
www.AcadX.com


message | Thanks!
|
| In short it's: UNDO MARK followed by a few operations
|
| which means I can type UNDO BACK to undo everything the button did.
|
| I'm hoping that this BEGIN END business would put all the button's actions
| under one entry in AutoCAD's undo list, so that just pressing the undo
| button would work, instead of having to remember to type UNDO BACK.
|
| ...Well, writing that made me think clearer and I went back to the help
| files and now the new headache looks like this:
|
|
^C^CUNDO;BE;-XR;D;*;-LAYER;U;*;ON;*;T;*;S;0;;REGEN;BlockLay;AUDIT;Y;PURGE;A;
| ;N;PURGE;A;;N;PURGE;A;;N;PURGE;A;;N;UNDO;E;LayChk;
|
| and it works!
|
| So thanks again Doug
|
| | > HUW,
| > Sorry but it gives me a headache to look at that. I'll let you decide.
;-)
| >
|
|

 

Doing all menu customization in a separate menu that is then menuloaded
makes the upgrade/installation process a no-brainer.

--
R. Robert Bell, MCSE
www.AcadX.com


message | Seeing as AutoCAD allows you to create custom buttons easily, but makes
you
| jump through rediculous hoops to copy one to another instal (let alone
| another version!) I'll accept that it works on my machine, under my
profile
| only...
|