OleFileIO.py 文件源码

def openstream(self, filename):
        """
        Open a stream as a read-only file object (BytesIO).
        Note: filename is case-insensitive.

        :param filename: path of stream in storage tree (except root entry), either:

            - a string using Unix path syntax, for example:
              'storage_1/storage_1.2/stream'
            - or a list of storage filenames, path to the desired stream/storage.
              Example: ['storage_1', 'storage_1.2', 'stream']

        :returns: file object (read-only)
        :exception IOError: if filename not found, or if this is not a stream.
        """
        sid = self._find(filename)
        entry = self.direntries[sid]
        if entry.entry_type != STGTY_STREAM:
            raise IOError("this file is not a stream")
        return self._open(entry.isectStart, entry.size)