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We had the same problem where people were cutting and pasting data deom e-mails. Word documents, spreadsheets etc.
This would then capture undisplayable characters within the data in files, so that when we attempted to re-display that information, the program/screen did not like it
What you need to do is look for any individual character within the text that is less than space and replace it with something else
We replaced it with space
Here is the code
dcl-proc Replacebadchar ;

Ix = 1;
Lengthoffield = %len(%trimr(Completestring));
dou Ix > Lengthoffield;
if Completestringind(Ix) < ' ';
Completestringind(Ix) = ' ';
endif;
Ix += 1;
enddo;

end-proc ;


Alan Shore
Solutions Architect
IT Supply Chain Execution

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From: MIDRANGE-L [mailto:midrange-l-bounces@xxxxxxxxxxxxxxxxxx] On Behalf Of Mark Villa
Sent: Tuesday, May 31, 2022 1:42 PM
To: Midrange Systems Technical Discussion <midrange-l@xxxxxxxxxxxxxxxxxx>
Subject: [EXTERNAL] Re: valid 5250 character set

Thank you for the help, we are getting a variety of invalid characters from
various sources, as you know, we can store in a field just fine but
displaying it through normal screen DSPF is limited to a valid set of
characters. I am assuming these characters can cause the printer to hang
from time to time also, but I don't really know of a case. I am
definitely going to need to review the reference, it would be nice to have
an automatic filter for bad data.

On Tue, May 31, 2022 at 1:09 PM James H. H. Lampert via MIDRANGE-L <
midrange-l@xxxxxxxxxxxxxxxxxx<mailto:midrange-l@xxxxxxxxxxxxxxxxxx>> wrote:

On 5/31/22 9:32 AM, Mark Villa wrote:
Trying to avoid "Invalid Data" on the 5250 display
Rob brings up a valid point. My previous answer assumed you are *not*
attempting to build a 5250 data stream "from scratch," but are instead
letting the operating system build it for you, e.g., using a display file.

How low-level do you need to go? A 5250 is not a Lear ADM-3, or even a
DEC VT-100. Building a 5250 data stream from scratch ("User-Defined") is
*not* for the faint of heart.

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JHHL
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--
Thank You,
Mark Villa
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