[英]python How can I stop an infinite while loop and continue with rest of code?
问题是如果不停止整个程序就无法退出while循环。
当我在Raspberry Pi上执行代码时,摄像机开始记录,但是当我想结束视频并按Ctrl + c时,整个程序将停止,而不是在while循环后继续。 我以为信号处理程序会捕获键盘中断,但事实并非如此。
我的代码:
import picamera
import signal
from time import sleep
from subprocess import call
def signal_handler(signal, frame):
global interrupted
interrupted = True
signal.signal(signal.SIGINT, signal_handler)
interrupted = False
# Setup the camera
with picamera.PiCamera() as camera:
camera.resolution = (1640, 922)
camera.framerate = 30
# Start recording
camera.start_recording("pythonVideo.h264")
while True:
sleep(0.5)
print("still recording")
if interrupted:
print("Ctrl+C pressed")
camera.stop_recording()
break
# Stop recording
#camera.stop_recording()
# The camera is now closed.
print("We are going to convert the video.")
# Define the command we want to execute.
command = "MP4Box -add pythonVideo.h264 convertedVideo.mp4 -fps 30"
#Execute command.
call([command], shell=True)
# Video converted.
print("Video converted.")
我试过的
bflag = True
while bflag ==True:
sleep(0.5)
print("still recording")
if interrupted:
print("Ctrl+C pressed")
camera.stop_recording()
bflag = False
错误:
pi@raspberrypi:~/Documents/useThisFolder $ python cookieVideo.py
still recording
still recording
still recording
still recording
still recording
^Cstill recording
Ctrl+C pressed
Traceback (most recent call last):
File "cookieVideo.py", line 29, in <module>
camera.stop_recording()
File "/usr/lib/python2.7/dist-packages/picamera/camera.py", line 1193, in stop_recording
'port %d' % splitter_port)
picamera.exc.PiCameraNotRecording: There is no recording in progress on port 1
这样做:
while True:
try:
sleep(0.5)
print("still recording")
except KeyboardInterrupt:
print("Ctrl+C pressed")
camera.stop_recording()
break
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