filterDemo.py 文件源码

def _bind_to_filter(self, fileName):
        """
        See if the file is a structured storage file or a normal file
        and then return an ifilter interface by calling the appropriate bind/load function
        """
        if pythoncom.StgIsStorageFile(fileName):
            self.stg  = pythoncom.StgOpenStorage(fileName, None, storagecon.STGM_READ | storagecon.STGM_SHARE_DENY_WRITE)
            try:
                self.f = ifilter.BindIFilterFromStorage(self.stg)
            except pythoncom.com_error, e:
                if e[0] == -2147467262: # 0x80004002: # no interface, try the load interface (this happens for some MSoft files)
                    self.f = ifilter.LoadIFilter(fileName)
                else:
                    raise
        else:
            self.f = ifilter.LoadIFilter(fileName)
            self.stg = None