pyqt4 gui应用程序不运行

Question

我使用 PyQt4 设计器来设计我的 GUI 应用程序，然后将 .ui 文件转换为 .py 文件。我尝试运行 .py 文件，但没有打开任何窗口。

.py 文件有什么问题？

from PyQt4 import QtCore, QtGui

try:
    _fromUtf8 = QtCore.QString.fromUtf8
except AttributeError:
    def _fromUtf8(s):
        return s

try:
    _encoding = QtGui.QApplication.UnicodeUTF8


    def _translate(context, text, disambig):
        return QtGui.QApplication.translate(context, text, disambig, _encoding)
except AttributeError:
    def _translate(context, text, disambig):
        return QtGui.QApplication.translate(context, text, disambig)


class Ui_MainWindow(QtGui.QMainWindow):
    def setupUi(self, MainWindow):
        MainWindow.setObjectName(_fromUtf8("MainWindow"))
        MainWindow.resize(460, 260)
        MainWindow.setMinimumSize(QtCore.QSize(460, 260))
        MainWindow.setMaximumSize(QtCore.QSize(460, 260))
        MainWindow.setBaseSize(QtCore.QSize(300, 100))
        self.centralwidget = QtGui.QWidget(MainWindow)
        self.centralwidget.setObjectName(_fromUtf8("centralwidget"))
        self.gridLayoutWidget = QtGui.QWidget(self.centralwidget)
        self.gridLayoutWidget.setGeometry(QtCore.QRect(0, 0, 451, 234))
        self.gridLayoutWidget.setObjectName(_fromUtf8("gridLayoutWidget"))
        self.gridLayout = QtGui.QGridLayout(self.gridLayoutWidget)
        self.gridLayout.setContentsMargins(-1, 5, -1, -1)
        self.gridLayout.setObjectName(_fromUtf8("gridLayout"))
        self.textBrowser = QtGui.QTextBrowser(self.gridLayoutWidget)
        self.textBrowser.setObjectName(_fromUtf8("textBrowser"))
        self.gridLayout.addWidget(self.textBrowser, 3, 2, 1, 1)
        self.pushButton_2 = QtGui.QPushButton(self.gridLayoutWidget)
        self.pushButton_2.setFlat(False)
        self.pushButton_2.setObjectName(_fromUtf8("pushButton_2"))
        self.gridLayout.addWidget(self.pushButton_2, 4, 2, 1, 1)
        self.label_3 = QtGui.QLabel(self.gridLayoutWidget)
        self.label_3.setIndent(5)
        self.label_3.setObjectName(_fromUtf8("label_3"))
        self.gridLayout.addWidget(self.label_3, 2, 0, 1, 1)
        self.lineEdit = QtGui.QLineEdit(self.gridLayoutWidget)
        self.lineEdit.setObjectName(_fromUtf8("lineEdit"))
        self.gridLayout.addWidget(self.lineEdit, 0, 2, 1, 1)
        self.label = QtGui.QLabel(self.gridLayoutWidget)
        self.label.setIndent(5)
        self.label.setObjectName(_fromUtf8("label"))
        self.gridLayout.addWidget(self.label, 0, 0, 1, 1)
        self.label_2 = QtGui.QLabel(self.gridLayoutWidget)
        self.label_2.setIndent(5)
        self.label_2.setObjectName(_fromUtf8("label_2"))
        self.gridLayout.addWidget(self.label_2, 1, 0, 1, 1)
        self.lineEdit_2 = QtGui.QLineEdit(self.gridLayoutWidget)
        self.lineEdit_2.setObjectName(_fromUtf8("lineEdit_2"))
        self.gridLayout.addWidget(self.lineEdit_2, 1, 2, 1, 1)
        self.pushButton = QtGui.QPushButton(self.gridLayoutWidget)
        self.pushButton.setObjectName(_fromUtf8("pushButton"))
        self.gridLayout.addWidget(self.pushButton, 1, 3, 1, 1)
        self.lineEdit_3 = QtGui.QLineEdit(self.gridLayoutWidget)
        self.lineEdit_3.setObjectName(_fromUtf8("lineEdit_3"))
        self.gridLayout.addWidget(self.lineEdit_3, 2, 2, 1, 1)
        self.pushButton_3 = QtGui.QPushButton(self.gridLayoutWidget)
        self.pushButton_3.setObjectName(_fromUtf8("pushButton_3"))
        self.gridLayout.addWidget(self.pushButton_3, 2, 3, 1, 1)
        MainWindow.setCentralWidget(self.centralwidget)
        self.menubar = QtGui.QMenuBar(MainWindow)
        self.menubar.setGeometry(QtCore.QRect(0, 0, 460, 21))
        self.menubar.setObjectName(_fromUtf8("menubar"))
        MainWindow.setMenuBar(self.menubar)
        self.statusbar = QtGui.QStatusBar(MainWindow)
        self.statusbar.setObjectName(_fromUtf8("statusbar"))
        MainWindow.setStatusBar(self.statusbar)

        self.retranslateUi(MainWindow)
        QtCore.QMetaObject.connectSlotsByName(MainWindow)

    def retranslateUi(self, MainWindow):
        MainWindow.setWindowTitle(_translate("MainWindow", "Email Find", None))
        self.pushButton_2.setText(_translate("MainWindow", "Find", None))
        self.label_3.setText(_translate("MainWindow", "Emails File", None))
        self.label.setText(_translate("MainWindow", "URL", None))
        self.label_2.setText(_translate("MainWindow", "File", None))
        self.pushButton.setText(_translate("MainWindow", "Browse", None))
        self.pushButton_3.setText(_translate("MainWindow", "Browse", None))

Answer 1

pyuic4（类似于常规 Qt uic）不会为您提供直接运行以获得窗口的文件，它只是生成一个构建 MainWindow 的“UI 内容”的类（或其他类似窗口的类型），您将继承以添加自己的东西；这个想法是您希望对窗口（事件处理程序等）进行自己的自定义，同时将构建设计器绘制的 UI 的“无聊”部分委托给这个辅助类。

假设pyuic4 生成了您的ui_mainwindow.py 文件；在您的 mainwindow.py 中，您将拥有类似的内容：

import sys
from ui_mainwindow import Ui_MainWindow
from PyQt4.QtGui import QApplication

class MainWindow(Ui_MainWindow):
    def __init__(self, parent = None):
        Ui_MainWindow.__init__(self, parent)
        self.setupUi(self)
        # add your event handlers, extra code, ...

if __name__ == '__main__':
    app = QApplication(sys.argv)
    mw = MainWindow()
    mw.show()
    app.exec_()