<p>当我试图使用telnet从RS232-TCP/IP转换器获取数据时,我也遇到了同样的问题——telnetlib会从消息中抑制每0x00次。正如Fredrik Johansson很好地回答的那样,这就是telnetlib的实现方式。在</p>
<p>一种解决方案是重写telnetlib的Telnet类中的<code>process_rawq()</code>函数,该类不占用所有空字符:</p>
<pre><code>import telnetlib
from telnetlib import IAC, DO, DONT, WILL, WONT, SE, NOOPT
def _process_rawq(self):
"""Alteração da implementação desta função necessária pois telnetlib suprime 0x00 e \021 dos dados lidos
"""
buf = ['', '']
try:
while self.rawq:
c = self.rawq_getchar()
if not self.iacseq:
# if c == theNULL:
# continue
# if c == "\021":
# continue
if c != IAC:
buf[self.sb] = buf[self.sb] + c
continue
else:
self.iacseq += c
elif len(self.iacseq) == 1:
# 'IAC: IAC CMD [OPTION only for WILL/WONT/DO/DONT]'
if c in (DO, DONT, WILL, WONT):
self.iacseq += c
continue
self.iacseq = ''
if c == IAC:
buf[self.sb] = buf[self.sb] + c
else:
if c == SB: # SB ... SE start.
self.sb = 1
self.sbdataq = ''
elif c == SE:
self.sb = 0
self.sbdataq = self.sbdataq + buf[1]
buf[1] = ''
if self.option_callback:
# Callback is supposed to look into
# the sbdataq
self.option_callback(self.sock, c, NOOPT)
else:
# We can't offer automatic processing of
# suboptions. Alas, we should not get any
# unless we did a WILL/DO before.
self.msg('IAC %d not recognized' % ord(c))
elif len(self.iacseq) == 2:
cmd = self.iacseq[1]
self.iacseq = ''
opt = c
if cmd in (DO, DONT):
self.msg('IAC %s %d',
cmd == DO and 'DO' or 'DONT', ord(opt))
if self.option_callback:
self.option_callback(self.sock, cmd, opt)
else:
self.sock.sendall(IAC + WONT + opt)
elif cmd in (WILL, WONT):
self.msg('IAC %s %d',
cmd == WILL and 'WILL' or 'WONT', ord(opt))
if self.option_callback:
self.option_callback(self.sock, cmd, opt)
else:
self.sock.sendall(IAC + DONT + opt)
except EOFError: # raised by self.rawq_getchar()
self.iacseq = '' # Reset on EOF
self.sb = 0
pass
self.cookedq = self.cookedq + buf[0]
self.sbdataq = self.sbdataq + buf[1]
telnetlib.Telnet.process_rawq = _process_rawq
</code></pre>
<p>然后重写Telnet类的方法:</p>
^{pr2}$
<p>这就解决了我的问题。在</p>