[REBOL] Re: How to send big string to library and back?
From: petr:krenzelok:trz:cz at: 16-Apr-2001 11:13
----- Original Message -----
From: "Andrew Martin" <[Al--Bri--xtra--co--nz]>
To: <[rebol-list--rebol--com]>
Sent: Monday, April 16, 2001 10:29 AM
Subject: [REBOL] Re: How to send big string to library and back?
> > Is string sent to library interface being automatically ended once "0"
> char appears in it? (and vice versa - the same for string returning from
> library interface to Rebol?)
>
> Don't know for sure. I believe so, based on earlier information on Ally
> list. Example, was passing rebol strings to Windows message box, IIRC. The
> example script had no special problem with zero terminators, 'cause Rebol
> automatically put them in.
>
> > how should I put Rebol string datatype into array of unsigned values?
>
> I don't know where Rebol, the camera port and the C program fit in all
this.
> Is it like:
>
> Camera -> Serial Port -> Rebol Script -> C program/library
Camera -> Embedded Ethernet (TCP/IP) -> REBOL Script -> C library
I know exact size of image of course, so I also know certain size of string.
Maybe I just can't express myself correctly, so I will try once again:
I expect Rebol to put zero terminator at the end of the string, but let me
show a small example:
1)
image-data: "abcdefg"
rebol-2-library: "abcdefg0" ;OK
2)
image-data: "abc0defg" ; note "0" char as valid pixel value!
a) rebol-2-library: "abc0defg0" ;OK
b) rebol-2-library: "abc0" ; wrong - Rebol found 0 char inside fo script and
cuts the rest of image data ...
So, what will Rebol do? a) or b) ?
Excuse my lame questions, I am no C coder :-)
Thanks,
-pekr-
