Question

我正在为一个没有得到正确的更新。

我要做的是实例化一个类对象并调用其方法之一。此方法将启动一个处理异步结果的流程。该过程具有一个回调方法，该方法是我的对象的一个实例方法。当我的过程完成时，应该通过回调方法来更新类变量。这没有发生。在回调执行期间，一切看起来都很好。

有人可以指出我在这里做错了什么吗？

这是我的代码：

import subprocess
import logging
try:
    from multiprocessing import Process
except ImportError:
    # For pre 2.6 releases
    from threading import Thread as Process


def runner(printout, callback):
    command = "ls"
    data = subprocess.Popen(
        command,
        bufsize=100000,
        stdin=subprocess.PIPE,
        stdout=subprocess.PIPE,
        stderr=subprocess.PIPE)

    # wait until finished
    # get output
    (last_output, myerr) = data.communicate()
    last_output = bytes.decode(last_output)
    myerr = bytes.decode(myerr)
    if len(myerr) > 0:
        logging.debug(myerr)

    if printout and callable(callback):
        callback(last_output)
    return


class MyClass(object):
    def __init__(self, myres):
        if myres is None:
            logging.warning("No result object given. Results will be printed to stdout only!")
        self.results = myres

    def _result_callback(self, scan_results):
        if scan_results:
            for line in scan_results.splitlines():
                self.results = self.results + line
                print(self.results)

    def task_starter(self):
        process = Process(
            target=runner,
            args=(True, self._result_callback),
        )
        process.daemon = True
        process.start()
        while process.is_alive():
            logging.debug("Still running...")
            process.join(2)


result = ""
myjob = MyClass(result)
myjob.task_starter()
print("\n")
print("SAME RESULT: %s" % myjob.results)

预先感谢，巧克力卷

Python类变量未通过回调方法更新

0 个答案: