As graff notes you can't just pump raw binary in an expect it to display in any logical fashion. But given that you like the \x{1} notation why not do something like: 

$_ = "\000japh\njareh\000";
s/([^\040-\177])/sprintf "\\x{%02x}",ord($1)/eg;
print;

[download]

Which just hands the chars to Tk as you seem to want them displayed. Personally I would suggest a hex editor format like this typical output which has 3 cols (offset hex ascii ) 

File: jargon-4.4.7.tar.gz   size = 9061260 bytes    0%  [H] Press 'h' 
+for help
00000000:    1F 8B 08 00 3E 74 F0 3F 00 03 EC FD 07 3C 5C DF   ....>t.
+?.....<\.
00000010:    DF 2F 8A 8F 16 BD D7 28 51 93 E8 8C 3E 44 1B 7D   ./.....
+(Q...>D.}

[download]

With your solution you have ASCII printable taking 1 char width but non printables taking either 5 or 6. With hex it can always be 2 or decimal/octal 3 chars. You can display the printable ASCII as a separate column.....

cheers

tachyon

In reply to Re^3: Displaying NUL in a TK::Text widget by tachyon
in thread Displaying NUL in a TK::Text widget by thor

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