R help - Mar 2023 - VT-100 terminal escape sequences

R 4.2.1
OS X

Colleagues

I am using XOJO (formerly known as RealBasic) to create a GUI -- R code
generates the text that appears in the GUI.

Recently, VT-100 terminal control escape sequences appeared in the text, e.g.,:
         [?25h  TEXT
    [?25h[?25h	TEXT
It is not clear to me if the problem is generated by R or by XOJO.  And I did
not track whether this began following installation of a new version of R or of
XOJO (with no changes in the underlying code for either).

Of note, when I run the R code in a terminal in OS X, those errant characters do
not appear.

I would like the 
	[?25h
text to disappear.  

If the problem originates in XOJO, I assume that there is nothing that can be
done in R to solve the problem.  But, if there is something that can be done in
my R code, it would be useful to know about it.

Dennis

Dennis Fisher MD
P < (The "P Less Than" Company)
Phone / Fax: 1-866-PLessThan (1-866-753-7784)
www.PLessThan.com





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On Sat, 4 Mar 2023 14:36:23 -0800
Dennis Fisher <fisher at plessthan.com> wrote:
> R code generates the text that appears in the GUI.
How is R being run? As a child process? How does the XOJO program
interact with it?
> Recently, VT-100 terminal control escape sequences appeared in the
> text, e.g.,:
>          [?25h  TEXT
>     [?25h[?25h	TEXT
> It is not clear to me if the problem is generated by R or by XOJO.
"ESC [ ? 25 h" stands for "make the cursor visible". It may
be produced
by the readline implementation that R links to, depending on how the
process is launched, but I don't think that R itself is generating it.

-- 
Best regards,
Ivan