I am trying to follow some code. It is basically a python scratch interfacing
script.
Anyway part of the script has this code.
Searching google for >> greater than signs in code with python has its issues.
Can anyone clarify this stuff.
I know its about 4 bytes of data. It looks like its setting all bits HIGH to
me?
n = len(cmd)
a = array('c')
a.append(chr((n>> 24) & 0xFF))
a.append(chr((n>> 16) & 0xFF))
a.append(chr((n>> 8) & 0xFF))
a.append(chr(n & 0xFF))
More code for context for python version 2.7:
from array import array
import socket
import time
import sys
from Tkinter import Tk
from tkSimpleDialog import askstring
root = Tk()
root.withdraw()
PORT = 42001
HOST = askstring('Scratch Connector', 'IP:')
if not HOST:
sys.exit()
print("Connecting...")
scratchSock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
scratchSock.connect((HOST, PORT))
print("Connected!")
def sendScratchCommand(cmd):
n = len(cmd)
a = array('c')
a.append(chr((n>> 24) & 0xFF))
a.append(chr((n>> 16) & 0xFF))
a.append(chr((n>> 8) & 0xFF))
a.append(chr(n & 0xFF))
scratchSock.send(a.tostring() + cmd)
while True:
msg = askstring('Scratch Connector', 'Send Broadcast:')
if msg:
sendScratchCommand('broadcast "' + msg + '"')
Another for Python 3:
import socket
HOST = 'localhost'
PORT = 42001
s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
s.connect((HOST, PORT))
def sendCMD(cmd):
n = len(cmd)
a = []
a.append((n>> 24) & 0xFF)
a.append((n>> 16) & 0xFF)
a.append((n>> 8) & 0xFF)
a.append(n & 0xFF)
b = ''
for i in list(range(len(a))):
b += a[i]
s.send(bytes(b+cmd,'UTF-8'))
sendCMD('broadcast"hello"')
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