从命令提示符运行脚本时，PiCamera 无法初始化为类成员 [英] PiCamera cannot be initialized as a class member when the script is run from command prompt

问题描述

在我的 Raspberry Pi 上，我遇到了关于使用 PiCamera 模块的奇怪行为.

从 IDLE (F5) 或命令提示符 ($python test.py) 启动时，以下代码运行流畅

导入 picamera如果 __name__ == "__main__":相机=picamera.PiCamera()相机.关闭()

但是当我将相机对象放入一个类中时，代码只会在从 IDLE (F5) 启动时运行:

导入 picamera类 VF:def __init__(self):self.camera = picamera.PiCamera()def __del__(self):self.camera.close()如果 __name__ == "__main__":myvf = VF()

当我从命令提示符启动上述代码时，我收到以下错误消息:

<块引用>

mmal:mmal_vc_component_enable:无法启用组件:ENOSPC

回溯(最近一次调用最后一次):文件test.py"，第 14 行，在myvf = VF()

文件test.py"，第 6 行，initself.camera = picamera.PiCamera()

文件/usr/lib/python2.7/dist-packages/picamera/camera.py"，行379，在初始化camera_num, self.STEREO_MODES[stereo_mode],stereo_decimate)

文件/usr/lib/python2.7/dist-packages/picamera/camera.py"，行505，在_init_cameraprefix="无法启用相机组件")

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

picamera.exc.PiCameraMMALError:无法启用相机组件:资源不足(内存除外)

相机模块工作正常，我只是将代码精简到尽可能小的尺寸.有没有人知道这个问题或类似的问题，并且可能提供解决方案?Python 版本是 2.7，Raspberry Rasbiab-System 是完全最新的.提前致谢.

解决方案

我在这个问题上挣扎了几个小时，并不断收到资源不足"错误.我终于发现，在我的拍照功能中，我需要确保我是这样做的:

<前>相机 = PiCamera()(...此处的相机设置...)camera.capture(我的文件名)相机.关闭()

如果我不执行 close()，我每次都会收到该错误.因此，请确保在捕捉"之后立即调用 camera.close().它为我解决了问题.

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

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()

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()

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

mmal: mmal_vc_component_enable: failed to enable component: ENOSPC

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

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

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

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

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

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

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.

解决方案

I struggled with this one for hours, and kept getting the "out of resources" error. I finally figured out that in my take-the-picture function, I needed to make sure I did it like this:

    camera = PiCamera()
    (...camera settings here...)
    camera.capture(myfileName)
    camera.close()

If I didn't do the close(), I'd get that error every time. So make sure that camera.close() is getting called right after the 'snap'. It solved the problem for me.

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