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On Thu, 7 Nov 2019 at 10:46, C Browne [email protected] wrote:
>
> Adding to Brend's comment, one thing that can be confusing about the 3270
> is that nulls and blanks display the same. If there is a null after any
> non-blank characters in a field, it is possible to insert into the field.
> If there are blanks, then it is not.
>
There's another thing: Some TN3270 clients have an option to effectively
treat blanks as nulls for this purpose, i.e. to allow inserts and silently
roll blanks off the end as you insert. Or, if you like, to replace blanks
with nulls in most circumstances. This isn't in strict conformance with the
3270 architecture*, but it makes life a lot easier.
Tony H.
* Some later models of real 3270s had a feature called something like "text
input" (I'm sure that's not the right name, but it gets the idea across)
that did optionally allow this behaviour.
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<p><div dir=3D"ltr"><div class=3D"gmail_quote"><div dir=3D"ltr" class=
=3D"gmail_attr">On Thu, 7 Nov 2019 at 10:46, C Browne <a href=3D"mailto:bro=
[email protected]">[email protected]</a> wrote:<br></div><blockquote c=
lass=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-left:1px soli=
d rgb(204,204,204);">
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<br>
<font face=3D"Century Gothic">Adding to Brend's comment, one thing
that can be confusing about the 3270 is that nulls and blanks
display the same.=C2=A0 If there is a null after any non-blank
characters in a field, it is possible to insert into the field.=C2=A0
If there are blanks, then it is not.=C2=A0 </font></div></blockquote>=
<div><br></div><div>There's another thing: Some TN3270 clients have an =
option to effectively treat blanks as nulls for this purpose, i.e. to allow=
inserts and silently roll blanks off the end as you insert. Or, if you lik=
e, to replace blanks with nulls in most circumstances. This isn't in st=
rict conformance with the 3270 architecture*, but it makes life a lot easie=
r.</div><div><br></div><div>Tony H.</div><div><br></div><div>* Some later m=
odels of real 3270s had a feature called something like "text input&qu=
ot; (I'm sure that's not the right name, but it gets the idea acros=
s) that did optionally allow this behaviour.<br></div></div></div>
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