William McBrine wrote: > Here are a couple of functions that I feel stupid for having written. > They work, and they're pretty straightforward; it's just that I feel like > I must be missing an easier way to do this... > > def net_to_int(numstring): > """Convert a big-endian binary number, in the form of a string of > arbitrary length, to a native int. > """ > num = 0 > for i in numstring: > num *= 256 > num += ord(i) > return num > > def int_to_net(num): > """Convert a native int to a four-byte big-endian number, in the form > of a string. > """ > numstring = '' > for i in xrange(4): > numstring = chr(num % 256) + numstring > num /= 256 > return numstring > > The situation: I'm getting a four-byte packet from a socket that consists > of a big-endian 32-bit integer. (It specifies the length of the data that > follows.) I have to send the same thing in reply. send() and recv() work > with strings... I'm familiar with ntohl() and htonl(), but those expect/ > return integers.
The struct module should do it, but do you prefer your code or format strings? :-P <http://docs.python.org/lib/module-struct.html> -- -- http://mail.python.org/mailman/listinfo/python-list
