Question

我写了一个小脚本来制作一个Raspberry pi零的网络收音机。我首先在PI 3上编写了此代码。当我尝试将其编译为零时，出现此错误

Traceback (most recent call last):<br>
File "Radio.py", line 193, in <module> ChangeRadioChannel(0)<br>
File "Radio.py", line 87, in ChangeRadioChannel<br>
MyProcess.stdin.write('q')<br>
NameError: global name 'MyProcess' is not defined<br>

我添加了一些代码

    import RPi.GPIO as GPIO
    import os
    import keyboard
    from time import sleep
    import shlex, subprocess
    from MAX9744 import MAX9744

    # Channels
    CurrentChannel = 0
    Channels = [
        'Radio P.R.O.S.', 'http://audiostreamen.nl:8012',
        'Star Radio', 'http://internetradio.radiostar.be:8000/;stream.nsv&type=mp3',
    ]
    isPlaying = False

    GPIO.setup(Pin_Next, GPIO.IN, pull_up_down = GPIO.PUD_UP)
    GPIO.setup(Pin_Prev, GPIO.IN, pull_up_down = GPIO.PUD_UP)

    def ChangeRadioChannel(choice):
        print('Change radio channel')
        global CurrentChannel 
        global Channels
        global MyProcess
        global Amplifier

        CurrentChannel = CurrentChannel + choice*2

        if CurrentChannel < 0:
            CurrentChannel = len(Channels)-2
        if CurrentChannel > len(Channels)-1:
            CurrentChannel = 0

        MyProcess.stdin.write('q')
        sleep(0.5)
        Amplifier.set_volume(SPEECH_VOLUME)
        os.system('echo "' + Channels[CurrentChannel] + '" | festival --tts')
        Amplifier.set_volume(Volume)
        MyProcess = subprocess.Popen(['omxplayer', '-o', 'local', Channels[CurrentChannel+1]], stdin=subprocess.PIPE)
        file = open("LastChannel.txt","w")  #Store latest chosen channel in txt file
        file.write(str(CurrentChannel)+"\n")
        file.close()

    def Next(dummy):
        print('Next radio channel')
        ChangeRadioChannel(1)

    def Previous(dummy):
        print('Previous radio channel')
        ChangeRadioChannel(-1)

    GPIO.add_event_detect(Pin_Next, GPIO.RISING, callback = Next, bouncetime = 200)
    GPIO.add_event_detect(Pin_Prev, GPIO.RISING, callback = Previous, bouncetime = 200)

    try:
        try:
            # At boot
            # 1) restore volume
            try: 
                file = open("lastvolume.txt", "r")
                Volume = int(file.read())
                Amplifier.set_volume(Volume)
                file.close()
                print('Volume is set')
            except: pass

            # 2) restore channel
            file = open("LastChannel.txt","r")
            CurrentChannel = int(file.read())
            file.close()
            Amplifier.set_volume(SPEECH_VOLUME)
            os.system('echo "' + Channels[CurrentChannel] + '" | festival --tts')
            Amplifier.set_volume(Volume)
            MyProcess = subprocess.Popen(['omxplayer', '-o', 'local', Channels[CurrentChannel+1]], stdin=subprocess.PIPE)
        except:
            CurrentChannel=0
            ChangeRadioChannel(0)

        while True:
            sleep(0.5)
    except KeyboardInterrupt:
        GPIO.cleanup()

有人有想法吗？我将“ MyProcess”设置为全局，然后将其导入最好的祝福尼克

NameError：全局名称“ MyProcess”未定义

0 个答案: