Question

我正在尝试通过PyQt中的QThread来更新Qt GUI对象中的文本，但我只是得到了错误QPixmap: It is not safe to use pixmaps outside the GUI thread，然后它崩溃了。我非常感谢任何帮助，谢谢。

class MainWindow(QMainWindow, Ui_MainWindow):

    def __init__(self, parent = None):
        QMainWindow.__init__(self, parent)
        self.setupUi(self)
        self.output = Output()

    def __del__ (self):
        self.ui = None

    @pyqtSignature("")
    def on_goBtn_released(self):
        threadnum = 1
        #start threads
        for x in xrange(threadnum):
            thread = TheThread() 
            thread.start()


class Output(QWidget, Ui_Output):

    def __init__(self, parent = None):
        QWidget.__init__(self, parent)
        self.setupUi(self)
        self.ui = Ui_Output
        self.show()

    def main(self):
        self.textBrowser.append("sdgsdgsgsg dsgdsg dsgds gsdf")



class TheThread(QtCore.QThread):

    trigger = pyqtSignal()

    def __init__(self):
        QtCore.QThread.__init__(self)

    def __del__(self):
        self.wait()

    def run(self):
        self.trigger.connect(Output().main())
        self.trigger.emit()

Answer 1

self.trigger.connect(Output().main())

这一行存在问题。您正在线程中实例化一个类似于小部件的类。这是错的。您不应该在不同的线程中使用GUI元素。所有与GUI相关的代码都应该与事件循环在同一个线程中运行。

以上这条线在设计方面也是错误的。您从线程发出自定义信号，这是一个好方法。但处理此信号的对象应该是拥有/创建线程的对象，即您的MainWindow

您也不会保留对线程实例的引用。您可以在方法中创建它，但它是本地的。所以它将被垃圾收集，你可能会看到它在完成之前被删除的警告。

这是一个最小的工作示例：

import sys
from PyQt4 import QtGui, QtCore
import time
import random


class MyThread(QtCore.QThread):
    trigger = QtCore.pyqtSignal(int)

    def __init__(self, parent=None):
        super(MyThread, self).__init__(parent)

    def setup(self, thread_no):
        self.thread_no = thread_no

    def run(self):
        time.sleep(random.random()*5)  # random sleep to imitate working
        self.trigger.emit(self.thread_no)


class Main(QtGui.QMainWindow):
    def __init__(self, parent=None):
        super(Main, self).__init__(parent)
        self.text_area = QtGui.QTextBrowser()
        self.thread_button = QtGui.QPushButton('Start threads')
        self.thread_button.clicked.connect(self.start_threads)

        central_widget = QtGui.QWidget()
        central_layout = QtGui.QHBoxLayout()
        central_layout.addWidget(self.text_area)
        central_layout.addWidget(self.thread_button)
        central_widget.setLayout(central_layout)
        self.setCentralWidget(central_widget)

    def start_threads(self):
        self.threads = []              # this will keep a reference to threads
        for i in range(10):
            thread = MyThread(self)    # create a thread
            thread.trigger.connect(self.update_text)  # connect to it's signal
            thread.setup(i)            # just setting up a parameter
            thread.start()             # start the thread
            self.threads.append(thread) # keep a reference

    def update_text(self, thread_no):
        self.text_area.append('thread # %d finished' % thread_no)

if __name__ == '__main__':
    app = QtGui.QApplication(sys.argv)

    mainwindow = Main()
    mainwindow.show()

    sys.exit(app.exec_())

PyQt更新gui

1 个答案: