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所以我需要实现以下情形: - 多个任务作为进程同时运行。 - 每个任务应该有一个“取消”按钮,可以显示一个进度条,点击它应该终止它。创建wx.App的多个实例 - 可以吗?
为了实现响应式图形用户界面,我在单独的线程中为每个进程运行任务,似乎我还需要为每个进程创建一个单独的wx.App
,否则线程似乎没有运行。这种设置工作正常,但:
一)我不知道是否多wx.App
的是一个好主意或
B)如果有实现我的目标的更好的方法。 (注意:在这个示例代码中,我可以使用Update
方法wx.ProgressDialog
来确定是否按下了“取消”按钮,但是对于我的真实应用程序却不能这样做)。
import wx, multiprocessing, time, psutil
from multiprocessing import Queue
from threading import Thread
from wx.lib.pubsub import pub as Publisher
#runs the task
def task_runner(q):
pid = multiprocessing.current_process().pid
q.put(pid)
while True:
print("Process Running")
time.sleep(1)
wx.CallAfter(Publisher.sendMessage, "update") #call to update the bar
class TestPanel():
def __init__(self,name):
self.q = Queue()
self.count=0
max = 80
# dialog to see progress and cancel the task
self.dlg = wx.GenericProgressDialog(name,
"An informative message",
maximum = max,
parent=None,
style = wx.PD_CAN_ABORT
| wx.PD_APP_MODAL
| wx.PD_ELAPSED_TIME
)
#set listener to dialog's "Cancel" button
for child in self.dlg.GetChildren():
if isinstance(child, wx.Button):
cancel_function = lambda evt, parent=self.dlg: self.onClose(evt, parent)
child.Bind(wx.EVT_BUTTON, cancel_function)
#subscribe to update the progress bar from the thread
Publisher.subscribe(self.updateProgress, "update")
# start thread which runs some task
p = Thread(target=task_runner, args=(self.q,))
p.start()
#updates the progress bar
def updateProgress(self):
print("updating progress")
self.count=self.count+10
self.dlg.Update(self.count)
#kills the process
def kill(self, proc_pid):
process = psutil.Process(proc_pid)
for proc in process.children(recursive=True):
proc.kill()
process.kill()
#closing the dialog event
def onClose(self, event, dialog):
""""""
print "Closing dialog!"
pid = self.q.get()
self.kill(pid)
dialog.Destroy()
# run process, each process creates its own wx.App
def runProcess(name):
app = wx.App(False)
TestPanel(name)
app.MainLoop()
# worker class to use for multiprocessing pool
class Worker():
def __call__(self, name):
return runProcess(name)
if __name__ == '__main__':
items=['Bar1', 'Bar2']
pool = multiprocessing.Pool(processes=2)
result = pool.map(Worker(), items) #create two processes
pool.close()
感谢您的输入。其实我真正的应用程序(不是这里的代码),父进程** **不创建一个'wx.App' - 我就报告提出的任何问题。到目前为止,但我的问题是过程的终止 - 他们停止运行,当用户点击“取消”,但蟒的任务仍然保持在后台运行。我可能不得不在单独的问题中询问这个问题。 –