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以下代碼用於模擬嵌入式設備上的Modbus接口。不幸的是,它有一個更老的Python(2.4.3)。該代碼適用於2.7,但不適用於2.4.3,因爲我使用的Python版本不支持struct.pack_into,只支持struct.pack。我可以就如何解決這個問題得到一些建議嗎?我想我需要使用一個字符串也許並轉換爲一個字節緩衝區。這涉及非Python代碼,所以我相信pickle不能用。在Python 2.4.3中使用軟件包代替Pack_into
import socket
import sys
import array
import struct
def hexdump(src, length=16):
FILTER = ''.join([(len(repr(chr(x))) == 3) and chr(x) or '.' for x in range(256)])
lines = []
for c in xrange(0, len(src), length):
chars = src[c:c+length]
hex = ' '.join(["%02x" % ord(x) for x in chars])
printable = ''.join(["%s" % ((ord(x) <= 127 and FILTER[ord(x)]) or '.') for x in chars])
lines.append("%04x %-*s %s\n" % (c, length*3, hex, printable))
return ''.join(lines)
HOST = '192.168.1.187'
PORT = 502
s = socket.socket(socket.AF_INET,socket.SOCK_STREAM)
s.bind((HOST,PORT))
s.listen(1)
conn, addr = s.accept()
data = []
datatran = array.array('B', '\x00' * 14)
data = conn.recv(1024)
print 'Connect by', addr
while (data):
sys.stdout.write(hexdump(data))
TransID , ProtoColID, PacketLength, UnitID, FC, StartAddress, RegisterCount = struct.unpack_from(">hhhBBhh", data)
print TransID, ProtoColID, PacketLength, UnitID
print FC, StartAddress, RegisterCount
struct.pack_into(">hhhBBBh", datatran, 0, TransID , ProtoColID, PacketLength+2, UnitID, FC, 2, 51)
conn.sendall(datatran)
data = conn.recv(1024)
conn.close()
s.close()
感謝
是的,這是工作得非常好!!!!!謝謝Lex –