[RESOLVED] Writing binary data in file

hmvartak

How can I write binary data in file. I want to write value '0xEEFF' in a file where 0xEE and 0xFF are one byte values. When I open output file in hex editor, it should look like 'EEFF'. Unfortunately my codes translates E & F to their ASCII values and my file contains '4545 4646'. How can I avoid this translation?

NogDog

I'm guessing you'll want to use [man]pack/man as part of the process?

hmvartak

Yeah! That was pack() function. I had been tried pack() before this. But it just needed some extra binary-hex conversions. Finally it worked. Here is my code.

<html>
<?PHP

$fp = fopen("GTASA.B", 'rb');
$ptr = 0;
$sum = 0;

While($ptr < 202748)
{	
	fseek($fp, $ptr);
	$byte = fread($fp, 1);
	$ASCII = ord($byte);
	$sum = $sum + $ASCII;
	$ptr++;
}

fclose($fp);

$pksum = pack("V", $sum);

$fp = fopen("sum.txt", 'wb');
fwrite($fp, $pksum);
fclose($fp);

?>
</html>

This code reads file GTASA.B, make sum of all bytes in file and then write that sum as unsigned long in little endian byte order.

Thanks for all your help.