python - Kivy - windows - 根本找不到任何有值(value)的窗口提供者

Question

我从 kivy 开始。这是我正在运行的示例代码。

import kivy
from kivy.app import App
from kivy.uix.button import Label
kivy.require('1.9.0')


class HelloApp(App):
    def build(self):
        return Label(text='Hello World!')

if __name__ == "__main__":
    HelloApp().run()

这是我得到的回溯:

[INFO              ] [Logger      ] Record log in C:\Users\monac\.kivy\logs\kivy_16-11-23_9.txt
[INFO              ] [Kivy        ] v1.9.1
[INFO              ] [Python      ] v3.4.4 (v3.4.4:737efcadf5a6, Dec 20 2015, 20:20:57) [MSC v.1600 64 bit (AMD64)]
[INFO              ] [Factory     ] 179 symbols loaded
[INFO              ] [Image       ] Providers: img_tex, img_dds, img_gif, img_sdl2 (img_pil, img_ffpyplayer ignored)
[INFO              ] [Text        ] Provider: sdl2
[INFO              ] [OSC         ] using <thread> for socket
[INFO              ] [Window      ] Provider: sdl2
[INFO              ] [GL          ] GLEW initialization succeeded
[INFO              ] [GL          ] OpenGL version <b'4.5.0 NVIDIA 373.06'>
[INFO              ] [GL          ] OpenGL vendor <b'NVIDIA Corporation'>
[INFO              ] [GL          ] OpenGL renderer <b'GeForce GTX 960M/PCIe/SSE2'>
[INFO              ] [GL          ] OpenGL parsed version: 4, 5
[INFO              ] [GL          ] Shading version <b'4.50 NVIDIA'>
[INFO              ] [GL          ] Texture max size <16384>
[INFO              ] [GL          ] Texture max units <32>
[WARNING           ] [Image       ] Unable to load image <C:\Python34\lib\site-packages\kivy\data\glsl\default.png>
[CRITICAL          ] [Window      ] Unable to find any valuable Window provider at all!
sdl2 - Exception: SDL2: Unable to load image
  File "C:\Python34\lib\site-packages\kivy\core\__init__.py", line 67, in core_select_lib
    cls = cls()
  File "C:\Python34\lib\site-packages\kivy\core\window\window_sdl2.py", line 138, in __init__
    super(WindowSDL, self).__init__()
  File "C:\Python34\lib\site-packages\kivy\core\window\__init__.py", line 722, in __init__
    self.create_window()
  File "C:\Python34\lib\site-packages\kivy\core\window\window_sdl2.py", line 255, in create_window
    super(WindowSDL, self).create_window()
  File "C:\Python34\lib\site-packages\kivy\core\window\__init__.py", line 897, in create_window
    self.render_context = RenderContext()
  File "kivy\graphics\instructions.pyx", line 756, in kivy.graphics.instructions.RenderContext.__init__ (kivy\graphics\instructions.c:10729)
  File "C:\Python34\lib\site-packages\kivy\core\image\__init__.py", line 512, in __init__
    self.filename = arg
  File "C:\Python34\lib\site-packages\kivy\core\image\__init__.py", line 700, in _set_filename
    mipmap=self._mipmap, nocache=self._nocache)
  File "C:\Python34\lib\site-packages\kivy\core\image\__init__.py", line 430, in load
    im = loader(filename, **kwargs)
  File "C:\Python34\lib\site-packages\kivy\core\image\__init__.py", line 198, in __init__
    self._data = self.load(filename)
  File "C:\Python34\lib\site-packages\kivy\core\image\img_sdl2.py", line 42, in load
    raise Exception('SDL2: Unable to load image')

[CRITICAL          ] [App         ] Unable to get a Window, abort.
 Exception ignored in: 'kivy.properties.dpi2px'
 Traceback (most recent call last):
   File "C:\Python34\lib\site-packages\kivy\utils.py", line 513, in __get__
     retval = self.func(inst)
   File "C:\Python34\lib\site-packages\kivy\metrics.py", line 175, in dpi
     EventLoop.ensure_window()
   File "C:\Python34\lib\site-packages\kivy\base.py", line 126, in ensure_window
     sys.exit(1)
 SystemExit: 1
[CRITICAL          ] [App         ] Unable to get a Window, abort.

我在 Windows 10 64 位上运行。我已经安装了除 gstreamer 之外的所有依赖项，目前我不需要它。

我也不确定为什么会收到此错误:

[WARNING           ] [Image       ] Unable to load image <C:\Python34\lib\site-packages\kivy\data\glsl\default.png>

该文件存在，我正在以管理员身份运行我的代码以避免访问权限问题。

谢谢。

Answer 1

您必须安装 Kivy 的依赖项。

按照说明进行操作 here

python -m pip install docutils pygments pypiwin32 kivy.deps.sdl2 kivy.deps.glew

会做你需要的。