* Thus wrote Ren Fournier ([EMAIL PROTECTED]):
> When reading from a Socket Server, my Socket Client retrieves data that
> includes ASCII and binary data:
>
> while(($buf = socket_read($socket,128,PHP_BINARY_READ)) !== false) {
> $data .= $buf;
> if(preg_match("/ENX/", $data)) break;
> }
> echo "RESPONSE: ".$data."\n";
>
> The output looks like:
> RESPONSE: STX&The system is up and running.ENX
>
> Between the "STX" and "The system is up..." are 8 bytes of binary data
> (which this case appear as an ampersand), which I want to extract from
> $data, split into two 4 byte variables, and convert back into integers.
> I suspect that I need unpack() at some point, but any ideas how to
> extract and split the binary data from this string? (Sometimes, the
> binary data is not visible, but it's still there.)
//I would Assume that that was packed with something like this:
$string = 'The system is up and running.';
$pck = pack('a3iia*a3', 'STX', strlen($string), 38, $string, 'ENX');
echo $pck, "\n";
//So This will unpack it for you.
$unpacked = unpack('a3code/istrlen/itype/a*stringWithEndDelim', $pck);
print_r($unpacked);
//You'll notice the stringWithCode will have to be adjusted.
$stringResult = substr($unpacked['stringWithEndDelim'], 0, -3);
$stringEndDelim = substr($unpacked['stringWithEndDelim'], -3);
echo $stringResult, "\n" ;
echo $stringEndDelim, "\n" ;
// and check the string to make sure data isn't currupt:
if (strlen($stringResult) != $unpacked['strlen']) {
echo 'corrupt', "\n";
} else {
echo 'fine', "\n";
}
Curt
--
"I used to think I was indecisive, but now I'm not so sure."
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