PyQt5 线程

Question

尝试编写一个显示线程进程进度的类。我需要将此类用于所有“文件加载”操作；但是我在使其全球化时遇到了麻烦。

文件加载器.py：

from PyQt5.QtCore import pyqtSlot, pyqtSignal
from PyQt5.QtWidgets import QDialog
from PyQt5.uic import loadUi


class FileLoader(QDialog):
    completeSig = pyqtSignal()

    def __init__(self, parent=None):
        super(FileLoader, self).__init__(parent)
        self.filename = ""
        self.clientcode = ""
        self.thread = ""
        loadUi("GlobalUI/fileloader.ui", self)
        self.prgLoader.setValue(0)

    @pyqtSlot()
    def on_btnCancel_clicked(self):
        self.close()

    def closeEvent(self, e):
        self.thread.stop()

    def loadData(self):
        self.thread.totalSig.connect(self.prgLoader.setMaximum)
        self.thread.countSig.connect(self.prgLoader.setValue)
        self.thread.finished.connect(self.completed)
        self.thread.start()

    def completed(self):
        self.completeSig.emit()
        self.close()

loader.py

from PyQt5.QtCore import pyqtSignal, QThread

from fileloader import FileLoader


class DataLoader(QThread):
    totalSig = pyqtSignal(int)
    countSig = pyqtSignal(int)

    def __init__(self, parent=None):
        super(DataLoader, self).__init__(parent)
        self.threadactive = True
        self.commitsize = 300
        self.rowdata = []

    def run(self):
        print("Code Will Go Here For Loading the File")

    def stop(self):
        self.threadactive = False
        self.wait()


class PatDataLoader():
    def load(self, clientcode, filename):
        fl = FileLoader()
        fl.clientcode = clientcode
        fl.filename = filename
        fl.thread = DataLoader()
        fl.loadData()

我正在从另一个模块调用PatDataLoader.load("test","test.txt")。我遇到的问题是应用程序因QThread: Destroyed while thread is still running 而崩溃，因为我传递给文件加载器的线程进程似乎存在问题。我没有把这些部分正确地放在一起吗？

main.py:

from lmdb.patloader import PatDataLoader


    class PPSReportsApp(QMainWindow):
        def __init__(self, *args):
            super(PPSReportsApp, self).__init__(*args)
            loadUi("GlobalUI/ppsreportswindow.ui", self)
            #self.showMaximized()

    @pyqtSlot()
    def on_actionTest_triggered(self):
        pl = PatDataLoader()
        pl.load("TEST","testfile.txt")

Answer 1

在您的代码中，pl 是一个局部变量，因此当它完成执行 on_actionTest_triggered 时它将被删除，这可能会立即产生该问题。另一方面，no load 应该是静态方法，因为它不使用 self. self.thread 必须是None，比""好

如何防止pl 在完成处理之前被删除？

fl 是 QDialog，因此您可以使用 exec_()。

fileloader.py

class FileLoader(QDialog):
    completeSig = pyqtSignal()

    def __init__(self, parent=None):
        super(FileLoader, self).__init__(parent)
        self.filename = ""
        self.clientcode = ""
        self.thread = None
        loadUi("GlobalUI/fileloader.ui", self)
        self.prgLoader.setValue(0)

    @pyqtSlot()
    def on_btnCancel_clicked(self):
        self.close()

    def closeEvent(self, e):
        if self.thread:
            self.thread.stop()

    def loadData(self):
        if self.thread:
            self.thread.totalSig.connect(self.prgLoader.setMaximum)
            self.thread.countSig.connect(self.prgLoader.setValue)
            self.thread.finished.connect(self.completed)
            self.thread.start()

    def completed(self):
        self.completeSig.emit()
        self.close()

loader.py

class DataLoader(QThread):
    totalSig = pyqtSignal(int)
    countSig = pyqtSignal(int)

    def __init__(self, parent=None):
        super(DataLoader, self).__init__(parent)
        self.threadactive = True
        self.commitsize = 300
        self.rowdata = []

    def run(self):
        self.totalSig.emit(1000)
        print("Code Will Go Here For Loading the File")
        # emulate process
        for i in range(1000):
            if self.threadactive:
                QThread.msleep(10)
                self.countSig.emit(i)

    def stop(self):
        self.threadactive = False
        self.quit()
        self.wait()

class PatDataLoader():
    @staticmethod
    def load(clientcode, filename):
        fl = FileLoader()
        fl.clientcode = clientcode
        fl.filename = filename
        fl.thread = DataLoader()
        fl.loadData()
        fl.exec_() # <---

ma​​in.py

@pyqtSlot()
def on_actionTest_triggered(self):
    PatDataLoader.load("TEST","testfile.txt")