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。我试图运行.py文件，但没有打开窗口。

.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（正规的Qt uic类似）不给你一个文件，你直接运行得到一个窗口，它只是产生建立一个MainWindow的“UI内容”一类（或其他窗口类型），您将继承添加自己的东西;这个想法是，你想对窗口（事件处理程序等）进行自定义，同时将这个辅助类委托给构建设计器绘制的UI的“无聊”部分。

比方说pyuic4生成了你的ui_mainwindow.py文件;在你的mainwindow.py你会有这样的东西：

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_()