Question

我有这样的代码

import vlc                      # no error
Instance = vlc.Instance()       # no error
MediaPlayer = Instance.media_player_new()  # error triggered  here

错误消息是

Instance.media_player_new()
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "vlc.py", line 895, in media_player_new
    p._instance = self
AttributeError: 'NoneType' object has no attribute '_instance'

我正在使用python 2.6 我的代码有问题吗？

Answer 1

看起来像个错误。我在https://github.com/geoffsalmon/vlc-python/blob/master/generated/vlc.py处查看了代码（请参阅下面的代码段）。

看起来media_player_new调用libvlc_media_player_new（self），而libvlc_media_player_new调用本机libvlc_media_player_new（...）函数。此函数返回NULL，结果为None，进一步的代码失败。

根据doc字符串，如果发生错误，将返回NULL。也许您可以通过libvlc_log函数启用日志记录，看看出了什么问题。请参阅http://www.videolan.org/developers/vlc/doc/doxygen/html/group_libvlc_log.html

编辑：看起来您也可以通过vlc.py设置日志记录。（那时你不应该需要本地电话）

def media_player_new(self, uri=None):
    """Create a new MediaPlayer instance.

    @param uri: an optional URI to play in the player.
    """
    p = libvlc_media_player_new(self)
    if uri:
        p.set_media(self.media_new(uri))
    p._instance = self
    return p

和

def libvlc_media_player_new(p_libvlc_instance):
    '''Create an empty Media Player object.
    @param p_libvlc_instance: the libvlc instance in which the Media Player should be created.
    @return: a new media player object, or NULL on error.
    '''
    f = _Cfunctions.get('libvlc_media_player_new', None) or \
        _Cfunction('libvlc_media_player_new', ((1,),), class_result(MediaPlayer),
                    ctypes.c_void_p, Instance)
    return f(p_libvlc_instance)

VLC python模块在Ubuntu中不起作用

1 个答案: