当从命令提示符运行脚本时，不能将PiCamera初始化为类成员

问题描述

在我的树莓派，我遇到一个奇怪的行为，使用PiCamera模块。

on my Raspberry Pi, I encounter a strange behaviour regarding the use of the PiCamera module.

当从IDLE（F5）或从命令提示符（$ python test.py）启动时，以下代码运行顺畅

The following code runs smoothly when either started from IDLE (F5) or from the command prompt ($python test.py)

import picamera

if __name__ == "__main__":
    camera=picamera.PiCamera()
    camera.close()

但是当我把camera对象放到类中时，代码将只在从IDLE （F5）：

But when I put the camera object into a class the code will run only when started from IDLE (F5):

import picamera

class VF:
    def __init__(self):
        self.camera = picamera.PiCamera()

    def __del__(self):
        self.camera.close()


if __name__ == "__main__":
    myvf = VF()

从命令提示符上面的代码，我得到以下错误消息：

When I start the above code from the command prompt, I get the following error message:

跟踪（最近一次调用）：文件test.py，第14行，在

myvf = VF（）

Traceback (most recent call last): File "test.py", line 14, in myvf = VF()

在 init 中的文件test.py第6行：
self.camera = picamera.PiCamera（）

File "test.py", line 6, in init self.camera = picamera.PiCamera()

文件/usr/lib/python2.7/dist-packages/picamera/camera.py，行
379，在 init
camera_num中， self.STEREO_MODES [stereo_mode]，stereo_decimate）

File "/usr/lib/python2.7/dist-packages/picamera/camera.py", line 379, in init camera_num, self.STEREO_MODES[stereo_mode], stereo_decimate)

文件/usr/lib/python2.7/dist-packages/picamera/camera.py，行
505，in _init_camera
prefix =Camera component could not be enabled）

File "/usr/lib/python2.7/dist-packages/picamera/camera.py", line 505, in _init_camera prefix="Camera component couldn't be enabled")

文件/usr/lib/python2.7/dist-packages /picamera/exc.py，第133行，
in mmal_check
raise PiCameraMMALError（status，prefix）

File "/usr/lib/python2.7/dist-packages/picamera/exc.py", line 133, in mmal_check raise PiCameraMMALError(status, prefix)

picamera.exc.PiCameraMMALError：Camera组件无法启用：
缺少资源（内存除外）

picamera.exc.PiCameraMMALError: Camera component couldn't be enabled: Out of resources (other than memory)

相机模块工作正常，I只是把代码下降到最小的可能的大小。有人知道这个问题，或类似的问题，并可能提供一个解决方案？ Python版本是2.7，Raspberry Rasbiab系统是完全最新的。
提前感谢。

The camera module is working correct, I just stripped the code down to the least possible size. Does anybody know this problem, or a similar problem, and can probably provide a solution? The Python Version is 2.7 and the Raspberry Rasbiab-System is completely up to date.Thanks in advance.

推荐答案

发现，当析构函数是没有明确调用（LED已关闭，因此没有看到这个）。

Found out, that the camera-module is not properly shut down when the destructor is not explicitly called (had LED turned off, so didn't see this).

IDLE通过某种方式在脚本启动之前重置它，而不是python解释器。

IDLE handles a running camera by somehow resetting it before the script starts, but not the python interpreter.

现在当脚本结束之前调用析构函数时一切正常。

So everything is ok now when the destructor is called before the script ends.

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