先运行如下代码:
import win32gui import win32com import win32com.client import pythoncom import time class EventHandler: def OnVisible(self, visible): global bVisibleEventFired bVisibleEventFired = 1 def OnDownloadBegin(self): print "DownloadBegin" def OnDownloadComplete(self): print "DownloadComplete" def OnDocumentComplete(self, pDisp = pythoncom.Missing , URL = pythoncom.Missing): print "documentComplete of %s" % URL #这里用EventHandler类来处理ie中发生的事件,这里的函数名必须和事件名称一致。 ie = win32com.client.DispatchWithEvents("InternetExplorer.Application", EventHandler) ie.Visible = 1 ie.Navigate("www.aawns.com") #这里是等待事件的发生 pythoncom.PumpMessages() ie.Quit()
# -*- coding: cp936 -*- import win32gui import win32com import win32com.client import pythoncom import time class test: def runtest(self): print 'tuntest' class EventHandler: def OnVisible(self, visible): global bVisibleEventFired bVisibleEventFired = 1 def OnDownloadBegin(self): print "DownloadBegin" def OnDownloadComplete(self): print "DownloadComplete" def OnDocumentComplete(self, pDisp = pythoncom.Missing , URL = pythoncom.Missing): print "documentComplete of %s" % URL #在这里我们再调用test的runtest方法,看是否继承成功。 self.runtest() class runcom(test): def __init__(self): ie = win32com.client.DispatchWithEvents("InternetExplorer.Application", EventHandler) ie.Visible = 1 ie.Navigate("www.aawns.com") #这里调用test的runtest方法,看是否继承成功。 self.runtest() pythoncom.PumpMessages() ie.Quit() a=runcom()
运行结果是错误的。
tuntest DownloadBegin DownloadComplete DownloadBegin DownloadComplete documentComplete of http://www.aawns.com/ pythoncom error: Python error invoking COM method. Traceback (most recent call last): File "C:\Python23\Lib\site-packages\win32com\server\policy.py", line 283, in _ Invoke_ return self._invoke_(dispid, lcid, wFlags, args) File "C:\Python23\Lib\site-packages\win32com\server\policy.py", line 288, in _ invoke_ return S_OK, -1, self._invokeex_(dispid, lcid, wFlags, args, None, None) File "C:\Python23\Lib\site-packages\win32com\server\policy.py", line 550, in _ invokeex_ return func(*args) File "D:\python\test.py", line 24, in OnDocumentComplete self.runtest() File "C:\Python23\Lib\site-packages\win32com\client\__init__.py", line 454, in __getattr__ raise AttributeError, "'%s' object has no attribute '%s'" % (repr(self), att r) exceptions.AttributeError: '' object has no attribute 'runtest'
# -*- coding: cp936 -*- import win32gui import win32com import win32com.client import pythoncom import time class EventHandler: def OnVisible(self, visible): global bVisibleEventFired bVisibleEventFired = 1 def OnDownloadBegin(self): print "DownloadBegin" #先继承全局变量增加一个字符串 global testlist testlist.append("DownloadBegin") def OnDownloadComplete(self): print "DownloadComplete" #先继承全局变量增加一个字符串 global testlist testlist.append("DownloadComplete") def OnDocumentComplete(self, pDisp = pythoncom.Missing , URL = pythoncom.Missing): print "documentComplete of %s" % URL #先继承全局变量再打印 global testlist print testlist class runcom: def __init__(self): global testlist ie = win32com.client.DispatchWithEvents("InternetExplorer.Application", EventHandler) ie.Visible = 1 ie.Navigate("www.aawns.com") #打印全局变量 print testlist pythoncom.PumpMessages() ie.Quit() testlist=[] a=runcom()
可以看到,用全局变量的方式解决了于事件内传输数据的问题。
没有解决的问题:使用Twisted的时候也有相应的事件,如何保证Twisted 和com中的事件都被触发?
后来经过拐拐龙底咚朋友的提醒,知道了可以通过继承的方式将类的事件和属性继承下来。例子代码:
import win32gui import win32com import win32com.client import pythoncom import time class Test: def runtest(self): print 'test' class EventHandler: def OnVisible(self,visible): global bVisibleEventFired bVisibleEventFired = 1 def OnDownloadBegin(self): print 'DownloadBegin' self.runtest() self.value = 1 def OnDownloadComplete(self): print 'DownloadComplete' self.value += 1 def OnDocumentComplete(self,pDisp=pythoncom.Missing,URL=pythoncom.Missing): print 'documentComplete of %s' %URL print self.value class H(Test,EventHandler): pass ie = win32com.client.DispatchWithEvents('InternetExplorer.Application',H) ie.Visible = 1 ie.Navigate("www.sohu.com") pythoncom.PumpMessages() ie.Quit()