Re: [q-lang-users] null problemo

[Tim H. <q...@st...>]

Dr....@t-... (Albert Graef) writes:

> Hi, Tim!
>
> Tim Haynes wrote:
>> I'm trying to write a little utility to read & (manipulate &) write PNM
>> bitmap image files.
>
> Have you considered using Q's ImageMagick module for that purpose?

Yes, ish. I just wanted to be perverse and do it myself rather than dig
around to see how imagemagick worked.. :)

>> Reading is OK but I've had to declare that `ord ""=0' around my reader
>> function[1]; I'm having serious problems writing the ascii NUL byte out -
>> have tried declaring that `chr 0="\0"' and other variations on a theme, but
>> every time I try to fwritec the thing, the file truncates prematurely;
>> running hexdump shows that no byte in the output is set to 00.
>
> Yes, Q strings are 0-terminated, as in C, therefore you can't have a \0
> in a string (if you do, the string will be truncated there).
>
> What you probably need are byte strings. These are especially useful for
> encoding arbitrary binary data. See Section 12.3 (Clib -> Byte Strings) of
> the manual. Also see the section on binary files for operations on how to
> read and write such binary data from/to a file.

Right. Thanks a lot. I'll look into those. :)

~Tim
-- 
<http://spodzone.org.uk/>