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我正在尝试使用 applescript 来检索歌曲的 BPM 值。最终我想用一个游戏来实现它。这是我的代码:

import os
import time
import sys


def getBPM():
    iTunesInstruct = """'
    tell application "iTunes"
    set k to get bpm of current track
    end tell
    return k
    '"""
    bpm = os.system('arch -i386 osascript -e ' + iTunesInstruct )
    #bpm =90

    bpm = int(bpm)
    bpm = round(bpm)

    if bpm > 250:
        bpm = 200
    return bpm


def getBeatSecond(bpm):
    bps = float(bpm) / 60
    #raw_input(bps)
    return float(bps)

i = 0

beatMatch = True

while True:
    beat = 1 / getBeatSecond(getBPM()) # BPS Beat divided by a second.

    if beatMatch:
        time.sleep(beat)
        print beat
    else:
        raw_input('Go??')
    i += 1
    if i > 50:
        break

但这似乎只工作一次......它得到了我正在听的歌曲的 BPM,看到它是 94,然后似乎在第二次迭代中它认为它是 0,然后它除以 0 并死亡。这是怎么回事?

4

1 回答 1

1

os.system不等待命令完成。

90 = 是 osascript 的结果,0 = 没有错误,是退出状态(os.system)。

采用subprocess.Popen

from subprocess import Popen, PIPE

def getBPM():
    cmd = "arch -i386 osascript -e " + """'tell application "iTunes" to return bpm of current track'"""
    bpm, tError = Popen(cmd, shell=True, stdin=PIPE, stdout=PIPE, stderr=PIPE).communicate()
    if bpm > 250:
        return = 200
    return int(bpm)
于 2012-07-09T00:26:05.930 回答