循环时 GUI 变得无响应 [英] GUI become unresponsive while looping

问题描述

单击按钮后，表单将无响应，直到解析函数完成其工作.

After i click the button, the form become unresponsive until the parsing function finish its work.

我想将 searchAll 函数移至线程.我确实阅读了类似问题的几个答案，但我不明白如何.

I'd like to move searchAll function to thread. I did read several answers to similar questions, but i didn't understand how.

class MyForm(QDialog):


    def __init__(self):
        super().__init__()
        self.ui = Ui_Dialog()
        self.ui.setupUi(self)
        self.ui.buttonOK.clicked.connect(self.searchAll)
        self.show()

    def searchAll(self):

        sID = self.ui.txtSellerID.text()
        sUrl = "https://removed.com/" + sID + "/p/?section=2&page=1"
        sr = requests.get(sUrl)
        soup1 = BeautifulSoup(sr.text, "html.parser")

        NumberOfPagesBlock = soup1.find_all("li", class_="text-gray")

        if not NumberOfPagesBlock:
            QMessageBox.about(self, "Warning", "Nothing Here")
        else:
            items = re.compile(r'[^\d.]+')
            PagesCount = -(-items // 60)

            for i in range(1, int(PagesCount + 1)):
                itemsIdDs = soup1.find_all("div", class_="large-single-item")

                for itemsIdD in itemsIdDs:
                    iUrl = ("https://removed.com/" + itemsIdDs.get('data-ean') + "/s")
                    r = requests.get(iUrl)
                    soup = BeautifulSoup(r.text, "html.parser")
                    seller = soup.find("div", id="productTrackingParams")
                    title = (str(ctr) + '- ' + "Title " + str(seller.get('data-title')))
                    self.ui.txtDetails.appendPlainText(title)


if __name__ == "__main__":

    app = QApplication(sys.argv)
    w = MyForm()
    w.show()
    sys.exit(app.exec_())

推荐答案

你必须在另一个线程中执行繁重的任务(请求 + BeautifulSoup)，因为它们阻塞了 GUI 所在的主线程，阻止了 GUI 正常工作，例如，这可以通过冻结屏幕来体现.在这种情况下，我将实现一个工作线程方法:

You have to execute the heavy task (requests + BeautifulSoup) in another thread since they block the main thread where the GUI lives, preventing the GUI from working correctly and this is manifested, for example, by freezing the screen. In this case I will implement a worker-thread approach:

import re
import ssl
import sys
from functools import partial

import requests
from PyQt5.QtCore import QObject, QThread, QTimer, pyqtSignal, pyqtSlot
from PyQt5.QtWidgets import QApplication, QDialog, QMessageBox
from bs4 import BeautifulSoup

from foo_module import Ui_Dialog


class ScrapeWorker(QObject):
    started = pyqtSignal()
    finished = pyqtSignal()
    resultsChanged = pyqtSignal(str)
    errorSignal = pyqtSignal(str)

    @pyqtSlot(str)
    def run(self, text):
        self.started.emit()
        sUrl = "https://removed.com/{}/p/?section=2&page=1".format(text)
        try:
            sr = requests.get(sUrl)
        except Exception as e:
            self.errorSignal.emit("error: {}".format(e))
            self.finished.emit()
            return
        soup1 = BeautifulSoup(sr.text, "html.parser")
        NumberOfPagesBlock = soup1.find_all("li", class_="text-gray")
        if not NumberOfPagesBlock:
            self.errorSignal.emit("Nothing Here")
        else:
            items = re.compile(r"[^\d.]+")
            PagesCount = -(-items // 60)
            for i in range(1, int(PagesCount + 1)):
                itemsIdDs = soup1.find_all("div", class_="large-single-item")

                for itemsIdD in itemsIdDs:
                    iUrl = "https://removed.com/{}/s".format(itemsIdDs.get("data-ean"))
                    r = requests.get(iUrl)
                    soup = BeautifulSoup(r.text, "html.parser")
                    seller = soup.find("div", id="productTrackingParams")
                    title = "{}- Title {}".format(ctr, seller.get("data-title"))
                    self.resultsChanged.emit(title)
        self.finished.emit()


class MyForm(QDialog):
    def __init__(self):
        super().__init__()
        self.ui = Ui_Dialog()
        self.ui.setupUi(self)
        self.ui.buttonOK.clicked.connect(self.searchAll)

        thread = QThread(self)
        thread.start()

        self.m_worker = ScrapeWorker()
        self.m_worker.moveToThread(thread)
        self.m_worker.started.connect(self.onStarted)
        self.m_worker.finished.connect(self.onFinished)
        self.m_worker.resultsChanged.connect(self.onResultChanged)
        self.m_worker.errorSignal.connect(self.onErrorSignal)

    @pyqtSlot()
    def searchAll(self):
        sID = self.ui.txtSellerID.text()
        wrapper = partial(self.m_worker.run, sID)
        QTimer.singleShot(0, wrapper)

    @pyqtSlot(str)
    def onResultChanged(self, title):
        self.ui.txtDetails.appendPlainText(title)

    @pyqtSlot()
    def onStarted(self):
        self.ui.buttonOK.setEnabled(False)

    @pyqtSlot()
    def onFinished(self):
        self.ui.buttonOK.setEnabled(True)

    @pyqtSlot(str)
    def onErrorSignal(self, message):
        QMessageBox.about(self, "Warning", message)


if __name__ == "__main__":

    app = QApplication(sys.argv)
    w = MyForm()
    w.show()
    sys.exit(app.exec_())

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