pyqt从线程线程发出信号

Question

我正在尝试从多个线程更新pyqt QProgressBar，据我所知，最好的方法是将信号发送回主GUI线程（我尝试将QProgressBar对象传递给工作线程，尽管看起来确实如此工作我在翻译中得到了很多警告。在下面的代码中，我设置了一个progressSignal信号并将其连接到一个线程（现在）只打印发出的任何信息。然后我从每个线程中发出总百分比。我知道这可以在线程之外工作，只需在第47行抛出一个随机发射，这确实是通过。然而，第36行的发射不会触发任何东西，所以它似乎永远不会通过......

import Queue, threading
from PyQt4 import QtCore
import shutil
import profile

fileQueue = Queue.Queue()

class Communicate(QtCore.QObject):

    progressSignal = QtCore.pyqtSignal(int)

class ThreadedCopy:
    totalFiles = 0
    copyCount = 0
    lock = threading.Lock()

    def __init__(self, inputList, progressBar="Undefined"):
        self.totalFiles = len(inputList)

        self.c = Communicate()
        self.c.progressSignal.connect(self.updateProgressBar)

        print str(self.totalFiles) + " files to copy."
        self.threadWorkerCopy(inputList)


    def CopyWorker(self):
        while True:
            self.c.progressSignal.emit(2000)
            fileName = fileQueue.get()
            shutil.copy(fileName[0], fileName[1])
            fileQueue.task_done()
            with self.lock:
                self.copyCount += 1
                percent = (self.copyCount * 100) / self.totalFiles
                self.c.progressSignal.emit(percent)

    def threadWorkerCopy(self, fileNameList):

        for i in range(16):
            t = threading.Thread(target=self.CopyWorker)
            t.daemon = True
            t.start()
        for fileName in fileNameList:
            fileQueue.put(fileName)
        fileQueue.join()
        self.c.progressSignal.emit(1000)

    def updateProgressBar(self, percent):
        print percent

更新：

下面是带有gui的样本。这个运行但非常不稳定，它会定期崩溃，UI会做一些奇怪的事情（进度条没有完成，等等）

main.朋友:

import sys, os
import MultithreadedCopy_5
from PyQt4 import QtCore, QtGui

def grabFiles(path):
    # gets all files (not folders) in a directory
    for file in os.listdir(path):
        if os.path.isfile(os.path.join(path, file)):
            yield os.path.join(path, file)

class MainWin(QtGui.QWidget):

    def __init__(self):
        super(MainWin, self).__init__()
        self.initUI()

    def initUI(self):
        self.progress = QtGui.QProgressBar()

        box = QtGui.QVBoxLayout()
        box.addWidget(self.progress)
        goBtn = QtGui.QPushButton("Start copy")
        box.addWidget(goBtn)

        self.setLayout(box)

        goBtn.clicked.connect(self.startCopy)

    def startCopy(self):
        files = grabFiles("folder/with/files")
        fileList = []
        for file in files:
            fileList.append([file,"folder/to/copy/to"])

        MultithreadedCopy_5.ThreadedCopy(fileList, self.progress)

def main():
    app = QtGui.QApplication(sys.argv)
    ex = MainWin()
    ex.show()
    sys.exit(app.exec_())

if __name__ == "__main__":
    main()

multi threaded copy_5.朋友:

import Queue, threading
from PyQt4 import QtCore
import shutil
import profile

fileQueue = Queue.Queue()

class Communicate(QtCore.QObject):

    progressSignal = QtCore.pyqtSignal(int)

class ThreadedCopy:
    totalFiles = 0
    copyCount = 0
    lock = threading.Lock()

    def __init__(self, inputList, progressBar="Undefined"):
        self.progressBar = progressBar
        self.totalFiles = len(inputList)

        self.c = Communicate()
        self.c.progressSignal.connect(self.updateProgressBar, QtCore.Qt.DirectConnection)

        print str(self.totalFiles) + " files to copy."
        self.threadWorkerCopy(inputList)


    def CopyWorker(self):
        while True:
            fileName = fileQueue.get()
            shutil.copy(fileName[0], fileName[1])
            fileQueue.task_done()
            with self.lock:
                self.copyCount += 1
                percent = (self.copyCount * 100) / self.totalFiles
                self.c.progressSignal.emit(percent)

    def threadWorkerCopy(self, fileNameList):
        for i in range(16):
            t = threading.Thread(target=self.CopyWorker)
            t.daemon = True
            t.start()
        for fileName in fileNameList:
            fileQueue.put(fileName)
        fileQueue.join()

    def updateProgressBar(self, percent):
        self.progressBar.setValue(percent)

#profile.run('ThreadedCopy()')

Answer 1

另一答案