Carlos,

>I need undo the entry of the fiel using the @ ... Say.. Get traditional 
>command.

Pressing Ctrl+U -- while the Get object has focus -- will execute the 
"oGet:Undo()" method, and reset the contents of the "oGet:Buffer" to the 
contents of the "oGet:Original" buffer. This works fine in your code.

>The problem is that I did not enconter a way for to do it.
>Iaddedanexampletoask if someonecan,please, tell me what iswrong.

You try to execute the "oGet:Undo()" method in the code called by your 
"oGet:PostBlock" code block -- which is assigned with the Valid (or Range) 
clause of the "@ Get" command -- and this will be called from inside the 
"ReadModal()" function -- which is your "Read" command. Because the code
in the "GetPostValidate()" function changes the "oGet:Original" buffer to
the contents of the "oGet:Buffer", the UNDO functionality isn't available
anymore in your "_Back()" and "_RangeOK()" functions.

To change this behavior, you could modify/overload the "GetPostValidate()"
function in the "Alaska\XppW32\Source\Sys\GetSys.prg" program, where in 
line 305 "oGet:Reset()" is called, which will re-set the oGet:Original iVar
to the same value as the oGet:Buffer, making any "oGet:Undo()" after that
time impossible. Place in front of the "oGet:Reset()" the following line:

	"oGet:Cargo := oGet:Original"

Then in your "_Back()" and "_RangeOK()" functions, replace the calls to 
"oGet:Undo()" with the following:

	"oGet:VarPut(oGet:Cargo) ; oGet:UpdateBuffer()"

This will work the way you want it to work, I suppose. As I don't use the
console @ Get/Read mode, I don't know if this is by design or the same as
Clipper or could qualify as an error and require a PDR. But it seems that
line 346 in the "GetDoSetKey()" function in the "GetSys.prg" program would
indicate that this isn't intend behavior, and should qualify for a PDR,
even though this has been working like this since at least 12 years, and 
Xbase++ Version 1.20.178 behaves the same way. You might want to contact 
Alaska Support directly with this, if it's important to you. See also PDRs
109-2615 and 109-4509, even though they aren't quite accurate in their
descriptions and solutions.

Andreas

Andreas Gehrs-Pahl
Absolute Software, LLC

phone: (989) 723-9927
email: Andreas.GP@Charter.net
       Andreas_Gehrs-Pahl@EJusticeSolutions.com
       Andreas@DDPSoftware.com
web:   http://www.Aerospace-History.net

Hello Andreas:
good morning.
Many thanks. I did what you suggested and I built in  a function 
(GetUndo_()) that's working fine.
If one wish the solution I can post it here.

Beling
Greetings

Em 20/12/2010 19:27, Andreas Gehrs-Pahl escreveu:
> Carlos,
>
>> I need undo the entry of the fiel using the @ ... Say.. Get traditional
>> command.
> Pressing Ctrl+U -- while the Get object has focus -- will execute the
> "oGet:Undo()" method, and reset the contents of the "oGet:Buffer" to the
> contents of the "oGet:Original" buffer. This works fine in your code.
>
>> The problem is that I did not enconter a way for to do it.
>> Iaddedanexampletoask if someonecan,please, tell me what iswrong.
> You try to execute the "oGet:Undo()" method in the code called by your
> "oGet:PostBlock" code block -- which is assigned with the Valid (or Range)
> clause of the "@ Get" command -- and this will be called from inside the
> "ReadModal()" function -- which is your "Read" command. Because the code
> in the "GetPostValidate()" function changes the "oGet:Original" buffer to
> the contents of the "oGet:Buffer", the UNDO functionality isn't available
> anymore in your "_Back()" and "_RangeOK()" functions.
>
> To change this behavior, you could modify/overload the "GetPostValidate()"
> function in the "Alaska\XppW32\Source\Sys\GetSys.prg" program, where in
> line 305 "oGet:Reset()" is called, which will re-set the oGet:Original iVar
> to the same value as the oGet:Buffer, making any "oGet:Undo()" after that
> time impossible. Place in front of the "oGet:Reset()" the following line:
>
> 	"oGet:Cargo := oGet:Original"
>
> Then in your "_Back()" and "_RangeOK()" functions, replace the calls to
> "oGet:Undo()" with the following:
>
> 	"oGet:VarPut(oGet:Cargo) ; oGet:UpdateBuffer()"
>
> This will work the way you want it to work, I suppose. As I don't use the
> console @ Get/Read mode, I don't know if this is by design or the same as
> Clipper or could qualify as an error and require a PDR. But it seems that
> line 346 in the "GetDoSetKey()" function in the "GetSys.prg" program would
> indicate that this isn't intend behavior, and should qualify for a PDR,
> even though this has been working like this since at least 12 years, and
> Xbase++ Version 1.20.178 behaves the same way. You might want to contact
> Alaska Support directly with this, if it's important to you. See also PDRs
> 109-2615 and 109-4509, even though they aren't quite accurate in their
> descriptions and solutions.
>
> Andreas