PyQt5: Got同时使用QObject和QThread
PyQt5: Got同时使用QObject和QThread
提问于 2013-12-18 13:23:33
我在开发一个程序时遇到了一个问题，这个程序可以同时从不同的站点检索包含的内容(现在基本上是从两个或多个在线词典中检索一个单词的定义)。
我用QObject和QThread来开发我的程序。一开始一切都很顺利，但当我再次搜索和检索包含另一个单词的内容时，我得到了2个AttributeError。
import sys
from PyQt5.QtWidgets import QApplication, QMainWindow
from gui import Ui_MainWindow
from PyQt5.QtCore import QObject, QThread, pyqtSignal
class Searcher(QObject):
signalUpdate=pyqtSignal(str, str)
def __init__(self, dictionary, word):
super(Searcher, self).__init__()
self.dictionary=dictionary
self.word=word
def run(self):
self.signalUpdate.emit(self.dictionary, self.word)
class MyMainWindow(QMainWindow, Ui_MainWindow, QObject):
signalSearch=pyqtSignal()
def __init__(self, parent=None):
super(MyMainWindow, self).__init__()
self.setupUi(self)
self.dictList=['Yahoo dictionary', 'Webster dictionary']
self.searchThreads=[QThread(), QThread()]
def click(self):
word=self.lineEdit.text()
self.searchers=[]
for dictionary in self.dictList:
self.searchers.append(Searcher(dictionary, word))
for index , searcher in enumerate(self.searchers):
searcher.signalUpdate.connect(self.updateGUI)
searcher.moveToThread(self.searchThreads[index])
self.searchThreads[index].start()
self.signalSearch.connect(searcher.run)
self.signalSearch.emit()
def updateGUI(self, dictionary, word):
print(dictionary+'['+word+']')
if __name__ == "__main__":
app = QApplication(sys.argv)
myapp = MyMainWindow()
myapp.show()
sys.exit(app.exec_())我不知道如何处理这个问题。有人知道怎么摆脱它吗？
Traceback (most recent call last):
Traceback (most recent call last):
File "C:\workspace\online-dictionary\main.py", line 22, in run
File "C:\workspace\online-dictionary\main.py", line 22, in run
self.signalUpdate.emit(self.dictionary, self.word)
self.signalUpdate.emit(self.dictionary, self.word)
AttributeError: 'NoneType' object has no attribute 'signalUpdate'
AttributeError: 'NoneType' object has no attribute 'signalUpdate'回答 1
Stack Overflow用户
回答已采纳
发布于 2013-12-18 18:44:46
这个问题是由每次进行搜索时删除searcher对象列表造成的，这是不必要的。
您只需要创建一次搜索器对象，然后通过发出带有所需单词的signalSearch向它们发出请求。
所以searcher类看起来如下：
class Searcher(QObject):
signalUpdate = pyqtSignal(str, str)
def __init__(self, dictionary):
super(Searcher, self).__init__()
self.dictionary = dictionary
# word is sent by signalSearch
def run(self, word):
self.signalUpdate.emit(self.dictionary, word)主窗口类如下所示：
class MyMainWindow(QMainWindow, Ui_MainWindow):
signalSearch = pyqtSignal(str)
def __init__(self, parent=None):
super(MyMainWindow, self).__init__()
self.setupUi(self)
self.dictList = ['Yahoo dictionary', 'Webster dictionary']
self.searchThreads = []
self.searchers = []
# create all the threads and searchers once
for dictionary in self.dictList:
thread = QThread(self)
self.searchThreads.append(thread)
searcher = Searcher(dictionary)
self.searchers.append(searcher)
searcher.signalUpdate.connect(self.updateGUI)
self.signalSearch.connect(searcher.run)
searcher.moveToThread(thread)
thread.start()
def click(self):
# send a new word to the searchers
self.signalSearch.emit(self.lineEdit.text())
def updateGUI(self, dictionary, word):
print(dictionary+'['+word+']')页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/20659407
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