How to add a null character (ascii 0) to a string..

[Anonymous]

I am making a png file from some data downloaded.
I have to throw in null characters here and there and do not know how to write a null character to a file.
The null character is the ASCII character 0.
any ideas?
thx
James Maeding
Civil Engineer and Programmer
jmaeding - athunsaker - com

[Anonymous]

(chr 0) ?


"James Maeding" wrote in message news:4911840@discussion.autodesk.com...
I am making a png file from some data downloaded.
I have to throw in null characters here and there and do not know how to write a null character to a file.
The null character is the ASCII character 0.
any ideas?
thx
James Maeding
Civil Engineer and Programmer
jmaeding - athunsaker - com

[EC-CAD]

Let's say you have a symbol A, with value of "ABC".
To 'add' a Character 0..do
(setq A (strcat A (chr 0))); add null to end

Bob

[Anonymous]

You can't make a PNG file in LISP. LISP cannot
write or read binary files.

--
http://www.caddzone.com

AcadXTabs: MDI Document Tabs for AutoCAD 2004/2005/2006
http://www.acadxtabs.com

"James Maeding" wrote in message news:4911840@discussion.autodesk.com...
I am making a png file from some data downloaded.
I have to throw in null characters here and there and do not know how to write a null character to a file.
The null character is the ASCII character 0.
any ideas?
thx
James Maeding
Civil Engineer and Programmer
jmaeding - athunsaker - com

[Anonymous]

what about (write-char 256 fn)?
It worked for us...

Tony Tanzillo
|>You can't make a PNG file in LISP. LISP cannot
|>write or read binary files.

James Maeding
Civil Engineer and Programmer
jmaeding - athunsaker - com

[Anonymous]

if you add 256 to the ascii value, things take care of themselves, odd but true.
so the null char is actually (char 256)
James Maeding
Civil Engineer and Programmer
jmaeding - athunsaker - com

[Anonymous]

James:

> if you add 256 to the ascii value, things take care of themselves...

What happens when you try to write a 10, 13, or 26 using that approach?
--
Owen Wengerd
President, ManuSoft ==> http://www.manusoft.com
VP Americas, CADLock, Inc. ==> http://www.cadlock.com