我被困在一個可能很難解決任何其他問題的問題上。我想從通過套接字接收的xml字符串中創建元素樹,而不是從文件中獲取。xml字符串中的無效標記,無法創建元素樹python
方法:
下面這Python腳本是插座客戶端接收一個python字符串(恰好是XML)是通過使用TinyXML的一個C++服務器創建的。
程序步驟: 1)創建套接字 2)接收的XML字符串 3)解析XML成可在其他地方使用的元素樹
問題:
功能fromstring()不能似乎弄明白了。這裏是我的代碼:
import socket
import sys
import struct
import binascii
import io
import re
from xml.etree import ElementTree
#illegal characters to remove from string later before going to xml
RE_XML_ILLEGAL = u'([\u0000-\u0008\u000b-\u000c\u000e-\u001f\ufffe-\uffff])' + \
u'|' + \
u'([%s-%s][^%s-%s])|([^%s-%s][%s-%s])|([%s-%s]$)|(^[%s-%s])' % \
(unichr(0xd800),unichr(0xdbff),unichr(0xdc00),unichr(0xdfff),
unichr(0xd800),unichr(0xdbff),unichr(0xdc00),unichr(0xdfff),
unichr(0xd800),unichr(0xdbff),unichr(0xdc00),unichr(0xdfff))
HOST = 'localhost'
PORT = 50008
s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
print 'Socket created'
print 'Socket now connecting'
s.connect((HOST,PORT))
s.send('1')#as long as we are not sending "0" cpp server will return information.
#declare global xml object "root"
global root
while 1:
data = s.recv(1024)#receive the initial message
data3 = data[:3]#get first 3 letters
if (data3 == "New"):
#get ready for new packet
nextsizestring = data[3:]
nextsizestring2 = nextsizestring.rstrip('\0')
nextsize = int(nextsizestring2,10)
s.send('b')#tell cpp we are ready for the packet
databuf = s.recv(nextsize)#data buffer as a python string
databuf2 = re.sub(RE_XML_ILLEGAL, "?", databuf)#remove illegal xml characters
print(databuf2)
root = ElementTree.ElementTree(ElementTree.fromstring(databuf2))#convert to element tree
print(root)
elif (data3 != "New"):
print("WARNING! TCP SYNCH HAS FAILED")
if not data: break#if not data then stop listening for more
s.send('b')#keep sending anything but zero to get more stuff
conn.close()
s.close()
,這裏是輸出:
Socket created
Socket now connecting
<Frame>
<FrameNumber ="1509677" />
<Time ="27427839" />
<Forceplatedata>
<Forceplate_0>
<Subframe#_0>
<F_x ="0" />
<F_y ="0" />
<F_z ="0" />
</Subframe#_0>
.
.
.
</Frame>
Traceback (most recent call last):
File "<string>", line 11, in <module>
File "C:\Users\Gelsey Torres- Oviedo\Desktop\VizardFolderVRServer\Python2CPP_Client_rev1.py", line 50, in <module>
root = ElementTree.ElementTree(ElementTree.fromstring(databuf2))
File "C:\Program Files (x86)\WorldViz\Vizard4\bin\lib\xml\etree\ElementTree.py", line 1282, in XML
parser.feed(text)
File "C:\Program Files (x86)\WorldViz\Vizard4\bin\lib\xml\etree\ElementTree.py", line 1624, in feed
self._raiseerror(v)
File "C:\Program Files (x86)\WorldViz\Vizard4\bin\lib\xml\etree\ElementTree.py", line 1488, in _raiseerror
raise err
xml.etree.ElementTree.ParseError: not well-formed (invalid token): line 2, column 18
我把上面的截斷,因爲它是相當長XML字符串的自由。正如你在錯誤中看到的那樣,它看起來像第2行第18行有一個問題,我認爲它是空格字符。我不明白爲什麼會發生這種情況。
失敗解決方案:
1)StringIO的解析(通字符串) 2)編碼和解碼的UTF-8 3)minidom命名類似的方法的幾種變化
我猜測這是一個句法問題?我可能在做一些非常愚蠢的事情......
這......不是xml的工作原理,是嗎?你需要'',而不僅僅是'',不是嗎? –
senshin
好點,我沒有想到,我用tinyxml setattribute()來放置這些數字,但是沒有注意到這個語法可能是錯誤的。讓我檢查一下...... – willpower2727