Hiding non printing characters

Question

I have migrated character mode report from 2.5 to 10g and mapped the o/p to open in textpad using orarrp.
But i am getting non printing characters in the o/p when viewed in any editor but in print out they won't appear.
So how to hide this non printing characters.
The characters are like "square box" followed by "g","square box" followed by "m","square box" followed by "p"
This is the prt file which i am using
printer "wide"
height 72
width 132
code "01" esc 15
code "18" 18
code "10" esc 80
code "12" esc 77
code "15" esc "g"
after page control(L)
return control(M)
linefeed control(J)
pls help

Answer 1

so use the Document
pattern it after the FixedLengthDocument in the tutorial
store the real string in the extended document class
when the user types an invalid character, it is not added to the text pane.
there is a getText method in the Document (i think)
have it return the real string with all the characters
when the user types in the textPane, it will be added to the string in your
document class but will not be seen in the text area because you have
filtered it.
I think you can figure it out. I haven't tested this exact theory but have done
something similar