Question

嗨大家我已经在这段代码上工作了很长一段时间，但是一旦代码感知了动作，拍了一张照片并将其作为电子邮件附件发送，它就可以工作一次但是一旦状态恢复到准备状态就会出现这个错误，但我不明白为什么。我为包含整个代码而道歉，因为虽然错误陈述第43行，但我不确定是什么导致它出错。任何建议将不胜感激。我是python编程的初学者，所以我可能会遗漏一些非常明显的东西。顺便说一句，我在树莓派上运行它，适合想要测试代码的人。感谢

import os, re
import sys
import smtplib
import RPi.GPIO as GPIO
import time
import picamera
from email.mime.image import MIMEImage
from email.mime.multipart import MIMEMultipart
from email.mime.text import MIMEText


GPIO.setmode(GPIO.BCM)


GPIO_PIR = 4

print "PIR Module Test (CTRL-C to exit)"


GPIO.setup(GPIO_PIR,GPIO.IN)     

Current_State  = 0
Previous_State = 0
cam = picamera.PiCamera()
try:

  print "Waiting for PIR to settle ..."


  while GPIO.input(GPIO_PIR)==1:
    Current_State  = 0

  print "  Ready"


  while True :


    Current_State = GPIO.input(GPIO_PIR)

    if Current_State==1 and Previous_State==0:
      print "  Motion detected!"
      cam.capture('/home/pi/Eaglecam/surveillance.jpg')
      print('picture taken')
      cam.close()
      SMTP_SERVER = 'smtp.gmail.com'
      SMTP_PORT = 587       
      sender = '*******************'
      password = "secret!!"
      recipient = '*********************'
      subject = 'INTRUDER DETECTER!!'
      message = 'INTRUDER ALLERT!! INTRUDER ALERT!! CHECK OUT THIS PICTURE OF THE INTRUDER! SAVE THIS PICTURE AS EVIDENCE!'

      directory = "/home/pi/Eaglecam/"

      def main():
          msg = MIMEMultipart()
          msg['Subject'] = 'INTRUDER ALERT'
          msg['To'] = recipient
          msg['From'] = sender

          files = os.listdir(directory)
          jpgsearch = re.compile(".jpg", re.IGNORECASE)
          files = filter(jpgsearch.search, files)
          for filename in files:
              path = os.path.join(directory, filename)
              if not os.path.isfile(path):
                  continue

              img = MIMEImage(open(path, 'rb').read(), _subtype="jpg")
              img.add_header('Content-Disposition', 'attachment', filename=filename)
              msg.attach(img)

          part = MIMEText('text', "plain")
          part.set_payload(message)
          msg.attach(part)

          session = smtplib.SMTP(SMTP_SERVER, SMTP_PORT)

          session.ehlo()
          session.starttls()
          session.ehlo
          session.login(sender, password)

          session.sendmail(sender, recipient, msg.as_string())
          session.quit()

      if __name__ == '__main__':   
      print('  Email Sent')
      Previous_State=1
    elif Current_State==0 and Previous_State==1:

      print "  Ready"
      Previous_State=0

    time.sleep(0.01)

except KeyboardInterrupt:
  print "  Quit"

  GPIO.cleanup()

这是错误：

Traceback (most recent call last):
  File "/home/pi/Python/hi2.py", line 43, in <module>
    cam.capture('/home/pi/Eaglecam/surveillance.jpg')
  File "/usr/lib/python2.7/dist-packages/picamera/camera.py", line 1446, in capture
    camera_port, output_port = self._get_ports(use_video_port, splitter_port)
  File "/usr/lib/python2.7/dist-packages/picamera/camera.py", line 708, in _get_ports
    self._camera[0].output[self.CAMERA_CAPTURE_PORT]
TypeError: 'NoneType' object has no attribute '__getitem__'

Answer 1

尝试不要保持cam对象... picamera按其认为合适的方式刷新并关闭，这样您可能无法使用正在使用的代码重复调用该对象。此外，如果拍摄第一张照片，则在.close()对象上调用cam方法。我可能会这样做：

surv_pic = open('/home/pi/Eaglecam/surveillance.jpg', 'wb')
if Current_State==1 and Previous_State==0:
    print "  Motion detected!"
    with picamera.PiCamera() as cam:
        ##if camera is not producing pictures because it is not warmed up yet uncomment the next two lines
        ##cam.start_preview()
        ##time.sleep(2)
        cam.capture(surv_pic)
    surv_pic.close()
    SMTP_SERVER = 'smtp.gmail.com'
    ## continue as is from here

运动传感循环错误Python？

1 个答案: