I'm actually moving from a string-encoded transport to binary for
compactness. The array can potentially get pretty large. I'm shooting
for the smallest possible representation of the data, which is 1 char
and 1 short per data point.
On February 23, 2010, Rene Veerman <rene7705@xxxxxxxxx> wrote:
have you considered using json as transport?
http://json.org/ has code you can re-use.
On Tue, Feb 23, 2010 at 7:29 AM, php.list@xxxxxxxx
<php.list@xxxxxxxx> wrote:
I have a desktop app that has a data structure that looks like this:
typedef struct MANGOpie
{
unsigned char mango;
unsigned short pie;
}
MANGOpie;
I manage a C array of these things in memory:
MANGOpie * pies = (MANGOpie *)malloc(count*sizeof(MANGOpie));
I pass these to a PHP script on my webserver who needs to unpack the array
of structs.
The unpack() PHP function appears to be what I need, but it doesn't
like the
formatting I'm using to describe an array of these structs:
"(Cmango/npie)*"
What it doesn't like are the parentheses. I've tried brackets and curlies
too, but nothing works. I have to have the parentheses to tell the parser
to repeat the entire struct:
mango
pie
mango
pie
mango
pie
...
Formatting without the parentheses -- "Cmango/npie*" -- is:
mango
pie
pie
pie
pie
pie
...
One workaround is to drop the struct and just manage two separate parallel
arrays of each data type in the desktop app:
unsigned char * mangos = (unsigned char *)malloc(count*sizeof(unsigned
char));
unsigned short * pies = (unsigned short *)malloc(count*sizeof(unsigned
short));
With PHP unpack() format strings:
"Cmango*"
"npie*"
But, I'd rather keep the struct for the sake of code clarity and neatness.
Another would be to iterate thru the binary data, unpacking one struct at a
time, but that would be slower, presumably.
Anyone know the trick to this?
Thanks.
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