Re: unpacking an array of structs...

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@gmail.com> 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@juun.com <php.list@juun.com> 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. -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php

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