More "Memory could not be read/written" (GRX)

[Nancy Palmquist]

Chris Sellitto wrote:
> All,
> 
> I want to share with you all a recent experience I had with the "Memory
> could not be read/written" error.  I had a selection process where the
> user could select items from a listbox.  When they were finished
> selecting all their choices, I built a variable that contained all of
> the items they had just chosen, (I know this is probably not the best
> way to do it, but it was easy, and it worked for us at the time), using
> the SHOW command.  Well it worked fine for about a year, until last
> week, when the user was getting this error.  After some debugging, I
> found that the error always occurred on this SHOW command to display the
> variable.  The variable was not defined, as I did not know how many
> items would be selected.  Also, the difference was that they were
> selecting many more items than usual.  This made the variable longer
> than the length of the screen (80 characters), and this is why I believe
> the error was occurring, because when you select less items, it would
> run fine, without errors.  I resolved this issue by displaying these
> items in a MSGBOX and using the \n option.  
> 
> Sorry to make a short story long, but maybe it might help someone else
> having a similar problem.
> 
> Christopher Sellitto
> VP Computer Operations
> Guaranteed Returns
> _______________________________________________
> Filepro-list mailing list
> Filepro-list at lists.celestial.com
> http://mailman.celestial.com/mailman/listinfo/filepro-list
> 
> 
You might want to load the selection list into an array that could be 
displayed with listbox.  This allows them to scroll around and could 
give you some edit possiblities.

I have also done this by writing the selections to a file, with a list 
variable.

For example,  the file has fields like this:

List Name	15
Account		10

They indicate a list name at the start of the selection and then I ask 
for accounts until they are finished.  Each is added to the selection 
file.  It can then be used in many ways.  Each list can be managed 
separately.  They can reuse a list as many times as they want.  Stuff 
like that.

Then as the selection is done, I just do a quick lookup to the file 
using an index built on both the fields, and if I have a match I select, 
if not I don't.

This kind of file can be used for all kinds of complex selections.  Just 
make sure you allow for multiuser options if that would be an issue.

Nancy


-- 
Nancy Palmquist 		MOS & filePro Training Available
Virtual Software Systems	Web Based Training and Consulting	
PHONE: (412) 835-9417		   Web site:  http://www.vss3.com