Question

我在同一个文件夹中有两个python文件“main.py”和“mainLauncher.py”。我正在创建一个应用程序，所以如果我运行 mainLauncher.py ，那么它正在成功运行并打开一个窗口，如下所示。

mainLauncher.py 的代码：

from PyQt5 import QtCore, QtGui, QtWidgets
class Ui_MainLauncher(object):

    def main_launcher_ui(self, WizardPage):

        WizardPage.setObjectName("WizardPage")
        WizardPage.resize(626, 284)
        WizardPage.setStyleSheet("background-color:#e0e0e0;\n"
                                 "border:none;")
        self.textBrowser = QtWidgets.QTextBrowser(WizardPage)
        self.textBrowser.setGeometry(QtCore.QRect(10, 20, 601, 51))
        self.textBrowser.viewport().setProperty("cursor", QtGui.QCursor(QtCore.Qt.IBeamCursor))
        self.textBrowser.setStyleSheet("border:none;\n"
                                       "color:#424242 ;\n"
                                       "font-family:futura light;\n"
                                       "")
        self.textBrowser.setFrameShape(QtWidgets.QFrame.WinPanel)
        self.textBrowser.setObjectName("textBrowser")
        self.next = QtWidgets.QPushButton(WizardPage)
        self.next.setGeometry(QtCore.QRect(390, 240, 84, 28))
        self.next.setCursor(QtGui.QCursor(QtCore.Qt.PointingHandCursor))
        self.next.setStyleSheet("border:1px solid #ccc;\n"
                                "background: QLinearGradient(x1: 0, y1: 0, x2: 0, y2: 1, stop: 0 #ccc, stop: 1 #fff);")
        self.next.setObjectName("next")
        self.quit = QtWidgets.QPushButton(WizardPage)
        self.quit.setGeometry(QtCore.QRect(490, 240, 84, 28))
        self.quit.setCursor(QtGui.QCursor(QtCore.Qt.PointingHandCursor))
        self.quit.setStyleSheet("border:1px solid #ccc;\n"
                                "background: QLinearGradient(x1: 0, y1: 0, x2: 0, y2: 1, stop: 0 #ccc, stop: 1 #fff);")
        self.quit.setObjectName("quit")
        self.retranslateUi(WizardPage
        QtCore.QMetaObject.connectSlotsByName(WizardPage)

    def retranslateUi(self, WizardPage):

        _translate = QtCore.QCoreApplication.translate
        WizardPage.setWindowTitle(_translate("WizardPage", "WizardPage"))
        self.textBrowser.setHtml(_translate("WizardPage",
                                            "<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.0//EN\" \"http://www.w3.org/TR/REC-html40/strict.dtd\">\n"
                                            "<html><head><meta name=\"qrichtext\" content=\"1\" /><style type=\"text/css\">\n"
                                            "p, li { white-space: pre-wrap; }\n"
                                            "</style></head><body style=\" font-family:\'futura 53\'; font-size:11pt; font-weight:400; font-style:normal;\">\n"
                                            "<p style=\" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;\"><span style=\" font-family:\'Cantarell\'; font-size:24pt; font-weight:600;\">Welcome to GDrive</span></p></body></html>"))
        self.next.setText(_translate("WizardPage", "Next"))
        self.quit.setText(_translate("WizardPage", "Quit"))

def retranslateUi(self, WizardPage):

    _translate = QtCore.QCoreApplication.translate
    WizardPage.setWindowTitle(_translate("WizardPage", "WizardPage"))
    self.textBrowser.setHtml(_translate("WizardPage",
                                        "<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.0//EN\" \"http://www.w3.org/TR/REC-html40/strict.dtd\">\n"
                                        "<html><head><meta name=\"qrichtext\" content=\"1\" /><style type=\"text/css\">\n"
                                        "p, li { white-space: pre-wrap; }\n"
                                        "</style></head><body style=\" font-family:\'futura 53\'; font-size:11pt; font-weight:400; font-style:normal;\">\n"
                                        "<p style=\" margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;\"><span style=\" font-family:\'Cantarell\'; font-size:24pt; font-weight:600;\">Welcome to GDrive</span></p></body></html>"))
    self.next.setText(_translate("WizardPage", "Next"))
    self.quit.setText(_translate("WizardPage", "Quit"))

def main_launch():
    import sys
    app = QtWidgets.QApplication(sys.argv)
    WizardPage = QtWidgets.QWizardPage()
    ui = Ui_MainLauncher()
    ui.main_launcher_ui(WizardPage)
    WizardPage.show()
    sys.exit(app.exec_())
main_launch()

现在，如果我从 mainLauncher.py 中移除 main_launch（）功能，并从 main.py 调用它。所以我将 main.py 改为：

import sys
from PyQt5 import QtWidgets
from mainLauncher import main_launch

app = QtWidgets.QApplication(sys.argv)
main_launch()  # calling of main_launch() which is in mainLaunch.py
sys.exit(app.exec_())

但如果我正在运行 main.py ，那么该窗口将进入 Not Responding 状态，我必须从任务管理器我得到以下输出：

任何人都可以告诉我为什么会这样，我该如何解决？我想从 main.py 运行 main_launch（）。

Answer 1

只有一个QApplication实例，因为它处理主循环，但在你的情况下，你创建了2，第二个生成第一个块。为了解决这个问题，我们验证只有一个新实例不存在才会被创建，因为它会将main.py更改为我接下来要显示的内容：

<强> main.py

import sys    
from PyQt5 import QtWidgets    
from mainLauncher import main_launch

if QtWidgets.QApplication.instance():
    app = QtWidgets.QApplication(sys.argv)

main_launch()

sys.exit(app.exec_())

Python3程序进入无响应状态

1 个答案: