pyrcc5将resources.qrc转换成py文件

需要通过pyrcc5将resources.qrc转换成py文件，并在主程序引入。 

pyrcc5 -o resources_rc.py resources.qrc

用python3+PyQt5改写Python Qt GUI快速编程的第6章实例主窗口

原创 2017年01月11日 10:14:12

• 标签：
• python/
• qt/
• gui/
• pyqt

• 
  

本文是对Python Qt GUI快速编程的第6章的例子MainWindow改写成python3+PyQt5的编码。改动中，本人发现了不少的坑要改动，下文大概列出一些需要更改的重点，并且附上改动后的代码，代码在Python3.5+PyQt5.7的环境下运行并测试正常。请大家参考学习。
此实例有以下程序：
/home/yrd/eric_workspace/charter6/Ui_newimagedlg.py
/home/yrd/eric_workspace/charter6/newimagedlg.py
/home/yrd/eric_workspace/charter6/helpform.py
/home/yrd/eric_workspace/charter6/resizedlg.py
/home/yrd/eric_workspace/charter6/mainwindow.py
资源文件:
/home/yrd/eric_workspace/charter6/resources.qrc
/home/yrd/eric_workspace/charter6/images
/home/yrd/eric_workspace/charter6/help
可在网路上寻找作者这本书的的代码资源获得资源文件。
重点内容：
1，因为settings.value(“RecentFiles”)本身就是list类型，故
self.recentFiles = settings.value(“RecentFiles”).toStringList()
改动为
self.recentFiles=settings.value(“RecentFiles”)
2，类型转换问题

self.restoreGeometry(      settings.value("MainWindow/Geometry").toByteArray())self.restoreState(settings.value("MainWindow/State").toByteArray())
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改动为

self.restoreGeometry(     QByteArray(settings.value("MainWindow/Geometry")))self.restoreState(QByteArray(settings.value("MainWindow/State")))  
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3，引入库的问题，有很多，只列一个例子：
from PyQt5.QtPrintSupport import QPrinter,QPrintDialog
4，实例中的坑，QFileDialog.getSaveFileName和QFileDialog.getOpenFileName所返回的结果是一个tupple。第一为文件名，第二个为文件类型。

fname,tpye = QFileDialog.getSaveFileName(self,       "Image Changer - Save Image", fname,       "Image files ({0})".format(" ".join(formats)))fname,tpye = QFileDialog.getOpenFileName(self,       "Image Changer - Choose Image", dir,       "Image files ({0})".format(" ".join(formats)))
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5，PyQt5开发中应该以python的字符串类型取代Qstring类型。self.recentFiles是list类型，故用append或insert而非prepend。

    def addRecentFile(self, fname):        if fname is None:            return        if not self.recentFiles.contains(fname):            self.recentFiles.prepend(QString(fname))            while self.recentFiles.count() > 9:                self.recentFiles.takeLast()改成    def addRecentFile(self, fname):        if fname is None:            return        if fname not in self.recentFiles:            self.recentFiles.insert(0,fname)            while len(self.recentFiles) > 9:                self.recentFiles.pop()
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6，信号槽的问题，现举个例子：
self.connect(action, SIGNAL(“triggered()”),self.loadFile)
改成
action.triggered[bool].connect(self.loadFile)
槽self.loadFile根据实际情况也做了些变动。

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需要通过pyrcc5将resources.qrc转换成py文件，并在主程序引入。
pyrcc5 -o resources_rc.py resources.qrc

/home/yrd/eric_workspace/charter6/resources.qrc

<!DOCTYPE RCC><RCC version="1.0"><qresource><file alias="filenew.png">images/filenew.png</file><file alias="fileopen.png">images/fileopen.png</file><file alias="filesave.png">images/filesave.png</file><file alias="filesaveas.png">images/filesaveas.png</file><file alias="fileprint.png">images/fileprint.png</file><file alias="filequit.png">images/filequit.png</file><file alias="editinvert.png">images/editinvert.png</file><file alias="editswap.png">images/editswap.png</file><file alias="editzoom.png">images/editzoom.png</file><file alias="editmirror.png">images/editmirror.png</file><file alias="editunmirror.png">images/editunmirror.png</file><file alias="editmirrorhoriz.png">images/editmirrorhoriz.png</file><file alias="editmirrorvert.png">images/editmirrorvert.png</file><file alias="back.png">images/back.png</file><file alias="home.png">images/home.png</file><file alias="icon.png">images/icon.png</file><file>help/editmenu.html</file><file>help/filemenu.html</file><file>help/index.html</file></qresource></RCC>
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/home/yrd/eric_workspace/charter6/Ui_newimagedlg.py

# -*- coding: utf-8 -*-from PyQt5 import QtCore, QtGui, QtWidgetsclass Ui_NewImageDlg(object):    def setupUi(self, NewImageDlg):        NewImageDlg.setObjectName("NewImageDlg")        NewImageDlg.resize(287, 214)        self.gridlayout = QtWidgets.QGridLayout(NewImageDlg)        self.gridlayout.setContentsMargins(9, 9, 9, 9)        self.gridlayout.setSpacing(6)        self.gridlayout.setObjectName("gridlayout")        self.buttonBox = QtWidgets.QDialogButtonBox(NewImageDlg)        self.buttonBox.setOrientation(QtCore.Qt.Horizontal)        self.buttonBox.setStandardButtons(QtWidgets.QDialogButtonBox.Cancel|QtWidgets.QDialogButtonBox.Ok)        self.buttonBox.setObjectName("buttonBox")        self.gridlayout.addWidget(self.buttonBox, 5, 1, 1, 2)        spacerItem = QtWidgets.QSpacerItem(269, 16, QtWidgets.QSizePolicy.Minimum, QtWidgets.QSizePolicy.Expanding)        self.gridlayout.addItem(spacerItem, 4, 0, 1, 3)        self.colorLabel = QtWidgets.QLabel(NewImageDlg)        self.colorLabel.setFrameShape(QtWidgets.QFrame.StyledPanel)        self.colorLabel.setFrameShadow(QtWidgets.QFrame.Raised)        self.colorLabel.setText("")        self.colorLabel.setScaledContents(True)        self.colorLabel.setObjectName("colorLabel")        self.gridlayout.addWidget(self.colorLabel, 3, 1, 1, 1)        self.label_3 = QtWidgets.QLabel(NewImageDlg)        self.label_3.setObjectName("label_3")        self.gridlayout.addWidget(self.label_3, 3, 0, 1, 1)        self.colorButton = QtWidgets.QPushButton(NewImageDlg)        self.colorButton.setObjectName("colorButton")        self.gridlayout.addWidget(self.colorButton, 3, 2, 1, 1)        self.brushComboBox = QtWidgets.QComboBox(NewImageDlg)        self.brushComboBox.setObjectName("brushComboBox")        self.gridlayout.addWidget(self.brushComboBox, 2, 1, 1, 2)        self.label_4 = QtWidgets.QLabel(NewImageDlg)        self.label_4.setObjectName("label_4")        self.gridlayout.addWidget(self.label_4, 2, 0, 1, 1)        self.label = QtWidgets.QLabel(NewImageDlg)        self.label.setObjectName("label")        self.gridlayout.addWidget(self.label, 0, 0, 1, 1)        self.label_2 = QtWidgets.QLabel(NewImageDlg)        self.label_2.setObjectName("label_2")        self.gridlayout.addWidget(self.label_2, 1, 0, 1, 1)        self.heightSpinBox = QtWidgets.QSpinBox(NewImageDlg)        self.heightSpinBox.setAlignment(QtCore.Qt.AlignRight)        self.heightSpinBox.setMinimum(8)        self.heightSpinBox.setMaximum(512)        self.heightSpinBox.setSingleStep(4)        self.heightSpinBox.setProperty("value", 64)        self.heightSpinBox.setObjectName("heightSpinBox")        self.gridlayout.addWidget(self.heightSpinBox, 1, 1, 1, 1)        self.widthSpinBox = QtWidgets.QSpinBox(NewImageDlg)        self.widthSpinBox.setAlignment(QtCore.Qt.AlignRight)        self.widthSpinBox.setMinimum(8)        self.widthSpinBox.setMaximum(512)        self.widthSpinBox.setSingleStep(4)        self.widthSpinBox.setProperty("value", 64)        self.widthSpinBox.setObjectName("widthSpinBox")        self.gridlayout.addWidget(self.widthSpinBox, 0, 1, 1, 1)        self.label_4.setBuddy(self.brushComboBox)        self.label.setBuddy(self.widthSpinBox)        self.label_2.setBuddy(self.heightSpinBox)        self.retranslateUi(NewImageDlg)        self.buttonBox.accepted.connect(NewImageDlg.accept)        self.buttonBox.rejected.connect(NewImageDlg.reject)        QtCore.QMetaObject.connectSlotsByName(NewImageDlg)        NewImageDlg.setTabOrder(self.widthSpinBox, self.heightSpinBox)        NewImageDlg.setTabOrder(self.heightSpinBox, self.brushComboBox)        NewImageDlg.setTabOrder(self.brushComboBox, self.colorButton)        NewImageDlg.setTabOrder(self.colorButton, self.buttonBox)    def retranslateUi(self, NewImageDlg):        _translate = QtCore.QCoreApplication.translate        NewImageDlg.setWindowTitle(_translate("NewImageDlg", "Image Chooser - New Image"))        self.label_3.setText(_translate("NewImageDlg", "Color"))        self.colorButton.setText(_translate("NewImageDlg", "&Color..."))        self.label_4.setText(_translate("NewImageDlg", "&Brush pattern:"))        self.label.setText(_translate("NewImageDlg", "&Width:"))        self.label_2.setText(_translate("NewImageDlg", "&Height:"))        self.heightSpinBox.setSuffix(_translate("NewImageDlg", " px"))        self.widthSpinBox.setSuffix(_translate("NewImageDlg", " px"))
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/home/yrd/eric_workspace/charter6/newimagedlg.py

# -*- coding: utf-8 -*-"""Module implementing NewImageDlg."""from PyQt5.QtCore import pyqtSlot,Qt,QVariantfrom PyQt5.QtWidgets import QDialog,QApplication,QColorDialogfrom PyQt5.QtGui import QPixmap,QBrush,QPainterfrom Ui_newimagedlg import Ui_NewImageDlgclass NewImageDlg(QDialog, Ui_NewImageDlg):    """    Class documentation goes here.    """    def __init__(self, parent=None):        """        Constructor        @param parent reference to the parent widget        @type QWidget        """        super(NewImageDlg, self).__init__(parent)        self.setupUi(self)        self.color = Qt.red        for value, text in (            (Qt.SolidPattern, "Solid"),            (Qt.Dense1Pattern, "Dense #1"),            (Qt.Dense2Pattern, "Dense #2"),            (Qt.Dense3Pattern, "Dense #3"),            (Qt.Dense4Pattern, "Dense #4"),            (Qt.Dense5Pattern, "Dense #5"),            (Qt.Dense6Pattern, "Dense #6"),            (Qt.Dense7Pattern, "Dense #7"),            (Qt.HorPattern, "Horizontal"),            (Qt.VerPattern, "Vertical"),            (Qt.CrossPattern, "Cross"),            (Qt.BDiagPattern, "Backward Diagonal"),            (Qt.FDiagPattern, "Forward Diagonal"),            (Qt.DiagCrossPattern, "Diagonal Cross")):            self.brushComboBox.addItem(text, QVariant(value))        self.colorButton.clicked.connect(self.getColor)        self.brushComboBox.activated.connect(self.setColor)        self.setColor()        self.widthSpinBox.setFocus()    def getColor(self):        color = QColorDialog.getColor(Qt.black, self)        if color.isValid():            self.color = color            self.setColor()    def setColor(self):        pixmap = self._makePixmap(60, 30)        self.colorLabel.setPixmap(pixmap)    def image(self):        pixmap = self._makePixmap(self.widthSpinBox.value(),                                  self.heightSpinBox.value())        return QPixmap.toImage(pixmap)    def _makePixmap(self, width, height):        pixmap = QPixmap(width, height)        style = self.brushComboBox.itemData(                self.brushComboBox.currentIndex())        brush = QBrush(self.color, Qt.BrushStyle(style))        painter = QPainter(pixmap)        painter.fillRect(pixmap.rect(), Qt.white)        painter.fillRect(pixmap.rect(), brush)        return pixmap
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/home/yrd/eric_workspace/charter6/helpform.py

# -*- coding: utf-8 -*-from PyQt5.QtCore import QUrl, Qtfrom PyQt5.QtWidgets import QAction, QApplication, QDialog,QLabel, QTextBrowser, QToolBar, QVBoxLayoutfrom PyQt5.QtGui import QIcon,QKeySequenceimport resources_rcclass HelpForm(QDialog):    def __init__(self, page, parent=None):        super(HelpForm, self).__init__(parent)        self.setAttribute(Qt.WA_DeleteOnClose)        self.setAttribute(Qt.WA_GroupLeader)        backAction = QAction(QIcon(":/back.png"), "&Back", self)        backAction.setShortcut(QKeySequence.Back)        homeAction = QAction(QIcon(":/home.png"), "&Home", self)        homeAction.setShortcut("Home")        self.pageLabel = QLabel()        toolBar = QToolBar()        toolBar.addAction(backAction)        toolBar.addAction(homeAction)        toolBar.addWidget(self.pageLabel)        self.textBrowser = QTextBrowser()        layout = QVBoxLayout()        layout.addWidget(toolBar)        layout.addWidget(self.textBrowser, 1)        self.setLayout(layout)        backAction.triggered.connect(self.tbackward)        homeAction.triggered.connect(self.thome)        self.textBrowser.sourceChanged.connect(self.updatePageTitle)        self.textBrowser.setSearchPaths([":/help"])        self.textBrowser.setSource(QUrl(page))        self.resize(400, 600)        self.setWindowTitle("{0} Help".format(                QApplication.applicationName()))    def updatePageTitle(self):        self.pageLabel.setText(self.textBrowser.documentTitle())    def tbackward(self):        self.textBrowser.backward()    def thome(self):        self.textBrowser.home()
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/home/yrd/eric_workspace/charter6/resizedlg.py

# -*- coding: utf-8 -*-from PyQt5.QtCore import Qtfrom PyQt5.QtWidgets import (QApplication, QDialog, QDialogButtonBox,        QGridLayout, QLabel, QSpinBox)class ResizeDlg(QDialog):    def __init__(self, width, height, parent=None):        super(ResizeDlg, self).__init__(parent)        widthLabel = QLabel("&Width:")        self.widthSpinBox = QSpinBox()        widthLabel.setBuddy(self.widthSpinBox)        self.widthSpinBox.setAlignment(Qt.AlignRight|Qt.AlignVCenter)        self.widthSpinBox.setRange(4, width * 4)        self.widthSpinBox.setValue(width)        heightLabel = QLabel("&Height:")        self.heightSpinBox = QSpinBox()        heightLabel.setBuddy(self.heightSpinBox)        self.heightSpinBox.setAlignment(Qt.AlignRight|                                        Qt.AlignVCenter)        self.heightSpinBox.setRange(4, height * 4)        self.heightSpinBox.setValue(height)        buttonBox = QDialogButtonBox(QDialogButtonBox.Ok|                                     QDialogButtonBox.Cancel)        layout = QGridLayout()        layout.addWidget(widthLabel, 0, 0)        layout.addWidget(self.widthSpinBox, 0, 1)        layout.addWidget(heightLabel, 1, 0)        layout.addWidget(self.heightSpinBox, 1, 1)        layout.addWidget(buttonBox, 2, 0, 1, 2)        self.setLayout(layout)        buttonBox.accepted.connect(self.accept)        buttonBox.rejected.connect(self.reject)        self.setWindowTitle("Image Changer - Resize")    def result(self):        return self.widthSpinBox.value(), self.heightSpinBox.value()
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/home/yrd/eric_workspace/charter6/mainwindow.py

# -*- coding: utf-8 -*-"""Module implementing MainWindow."""from PyQt5.QtCore import pyqtSlot,Qt,PYQT_VERSION_STR,QT_VERSION_STR,QSettings,QTimer,QFile, QFileInfo,QByteArray,QVariantfrom PyQt5.QtWidgets import QMainWindow,QDockWidget,QLabel,QDockWidget,QListWidget,QApplication,\                            QFrame,QAction,QActionGroup,QMessageBox,QSpinBox,QFileDialog,QInputDialogfrom PyQt5.QtGui import QImage,QIcon,QKeySequence,QPixmap,QImageReader,QImageWriter,QPainterfrom PyQt5.QtPrintSupport import QPrinter,QPrintDialogimport helpformimport newimagedlgimport resizedlgimport platformimport sysimport resources_rcimport os__version__ = "1.0.0"class MainWindow(QMainWindow):    """    Class documentation goes here.    """    def __init__(self, parent=None):        """        Constructor        @param parent reference to the parent widget        @type QWidget        """        super(MainWindow, self).__init__(parent)        self.image = QImage()        self.dirty = False        self.filename = None        self.mirroredvertically = False        self.mirroredhorizontally = False        self.imageLabel = QLabel()        self.imageLabel.setMinimumSize(200, 200)        self.imageLabel.setAlignment(Qt.AlignCenter)        self.imageLabel.setContextMenuPolicy(Qt.ActionsContextMenu)        self.setCentralWidget(self.imageLabel)        logDockWidget = QDockWidget("Log", self)        logDockWidget.setObjectName("LogDockWidget")        logDockWidget.setAllowedAreas(Qt.LeftDockWidgetArea|                                      Qt.RightDockWidgetArea)        self.listWidget = QListWidget()        logDockWidget.setWidget(self.listWidget)        self.addDockWidget(Qt.RightDockWidgetArea, logDockWidget)        self.printer = None        self.sizeLabel = QLabel()        self.sizeLabel.setFrameStyle(QFrame.StyledPanel|QFrame.Sunken)        status = self.statusBar()        status.setSizeGripEnabled(False)        status.addPermanentWidget(self.sizeLabel)        status.showMessage("Ready", 5000)#clearMessage()        fileNewAction = self.createAction("&New...", self.fileNew,                                          QKeySequence.New, "filenew", "Create an image file")        fileOpenAction = self.createAction("&Open...", self.fileOpen,                                           QKeySequence.Open, "fileopen",                                           "Open an existing image file")        fileSaveAction = self.createAction("&Save", self.fileSave,                                           QKeySequence.Save, "filesave", "Save the image")        fileSaveAsAction = self.createAction("Save &As...",                                             self.fileSaveAs, icon="filesaveas",                                             tip="Save the image using a new name")        filePrintAction = self.createAction("&Print", self.filePrint,                                            QKeySequence.Print, "fileprint", "Print the image")        fileQuitAction = self.createAction("&Quit", self.close,                                           "Ctrl+Q", "filequit", "Close the application")                editInvertAction = self.createAction("&Invert",                                             self.editInvert, "Ctrl+I", "editinvert",                                             "Invert the image's colors", True, "toggled(bool)")        editSwapRedAndBlueAction = self.createAction("Sw&ap Red and Blue",                                                     self.editSwapRedAndBlue, "Ctrl+A", "editswap",                                                     "Swap the image's red and blue color components", True,                                                     "toggled(bool)")        editZoomAction = self.createAction("&Zoom...", self.editZoom,                                           "Alt+Z", "editzoom", "Zoom the image")        editResizeAction = self.createAction("&Resize...",                                             self.editResize, "Ctrl+R", "editresize",                                             "Resize the image")                mirrorGroup = QActionGroup(self)        editUnMirrorAction = self.createAction("&Unmirror",                                               self.editUnMirror, "Ctrl+U", "editunmirror",                                               "Unmirror the image", True, "toggled(bool)")        mirrorGroup.addAction(editUnMirrorAction)        editMirrorHorizontalAction = self.createAction(            "Mirror &Horizontally", self.editMirrorHorizontal,            "Ctrl+H", "editmirrorhoriz",            "Horizontally mirror the image", True, "toggled(bool)")        mirrorGroup.addAction(editMirrorHorizontalAction)        editMirrorVerticalAction = self.createAction(            "Mirror &Vertically", self.editMirrorVertical,            "Ctrl+V", "editmirrorvert",            "Vertically mirror the image", True, "toggled(bool)")        mirrorGroup.addAction(editMirrorVerticalAction)        editUnMirrorAction.setChecked(True)        helpAboutAction = self.createAction("&About Image Changer",                                            self.helpAbout)        helpHelpAction = self.createAction("&Help", self.helpHelp,                                           QKeySequence.HelpContents)        #file Menu        self.fileMenu = self.menuBar().addMenu("&File")        self.fileMenuActions = (fileNewAction, fileOpenAction,                                fileSaveAction, fileSaveAsAction, None, filePrintAction,                                fileQuitAction)        self.fileMenu.aboutToShow.connect(self.updateFileMenu)        #edit Menu        editMenu = self.menuBar().addMenu("&Edit")        self.addActions(editMenu, (editInvertAction,                                   editSwapRedAndBlueAction, editZoomAction,editResizeAction))                #mirrorMenu        mirrorMenu = editMenu.addMenu(QIcon(":/editmirror.png"),                                      "&Mirror")        self.addActions(mirrorMenu, (editUnMirrorAction,                                     editMirrorHorizontalAction, editMirrorVerticalAction))           #help Menu        helpMenu = self.menuBar().addMenu("&Help")        self.addActions(helpMenu, (helpAboutAction, helpHelpAction))           #tool bar        fileToolbar = self.addToolBar("File")        fileToolbar.setObjectName("FileToolBar")        self.addActions(fileToolbar, (fileNewAction, fileOpenAction,                                      fileSaveAsAction))        editToolbar = self.addToolBar("Edit")        editToolbar.setObjectName("EditToolBar")        self.addActions(editToolbar, (editInvertAction,                                      editSwapRedAndBlueAction, editUnMirrorAction,                                      editMirrorVerticalAction, editMirrorHorizontalAction))        self.zoomSpinBox = QSpinBox()        self.zoomSpinBox.setRange(1, 400)        self.zoomSpinBox.setSuffix(" %")        self.zoomSpinBox.setValue(100)        self.zoomSpinBox.setToolTip("Zoom the image")        self.zoomSpinBox.setStatusTip(self.zoomSpinBox.toolTip())        self.zoomSpinBox.setFocusPolicy(Qt.NoFocus)        self.zoomSpinBox.valueChanged[int].connect(self.showImage)        editToolbar.addWidget(self.zoomSpinBox)        self.addActions(self.imageLabel, (editInvertAction,                                          editSwapRedAndBlueAction, editUnMirrorAction,                                          editMirrorVerticalAction, editMirrorHorizontalAction))        self.resetableActions = ((editInvertAction, False),                                 (editSwapRedAndBlueAction, False),                                 (editUnMirrorAction, True))        settings = QSettings("MyCompany", "MyApp")        self.recentFiles=settings.value("RecentFiles")        #self.recentFiles = []        self.restoreGeometry(            QByteArray(settings.value("MainWindow/Geometry")))        self.restoreState(QByteArray(settings.value("MainWindow/State")))                  self.setWindowTitle("Image Changer")        self.updateFileMenu()        QTimer.singleShot(0, self.loadInitialFile)    def createAction(self, text, slot=None, shortcut=None, icon=None,                     tip=None, checkable=False, signal="triggered()"):        action = QAction(text, self)        if icon is not None:            action.setIcon(QIcon(":/{0}.png".format(icon)))        if shortcut is not None:            action.setShortcut(shortcut)        if tip is not None:            action.setToolTip(tip)            action.setStatusTip(tip)        if slot is not None and signal=="triggered()":            action.triggered.connect(slot)        if slot is not None and signal=="toggled(bool)":            action.toggled[bool].connect(slot)                if checkable:            action.setCheckable(True)        return action    def addActions(self, target, actions):        for action in actions:            if action is None:                target.addSeparator()            else:                target.addAction(action)    def updateFileMenu(self):        self.fileMenu.clear()        self.addActions(self.fileMenu, self.fileMenuActions[:-1])        current = self.filename        recentFiles = []        #self.recentFiles=[]        for fname in self.recentFiles:            if fname != current and QFile.exists(fname):                #recentFiles.insert(0,fname)                recentFiles.append(fname)        if recentFiles:            self.fileMenu.addSeparator()            for i, fname in enumerate(recentFiles):                action = QAction(QIcon(":/icon.png"),                                 "&{0} {1}".format(i + 1, QFileInfo(                                     fname).fileName()), self)                action.setData(QVariant(fname))                action.triggered[bool].connect(self.loadFile)                self.fileMenu.addAction(action)        self.fileMenu.addSeparator()        self.fileMenu.addAction(self.fileMenuActions[-1])            def okToContinue(self):        if self.dirty:            reply = QMessageBox.question(self,                    "Image Changer - Unsaved Changes",                    "Save unsaved changes?",                    QMessageBox.Yes|QMessageBox.No|QMessageBox.Cancel)            if reply == QMessageBox.Cancel:                return False            elif reply == QMessageBox.Yes:                return self.fileSave()        return True                    def fileNew(self):        if not self.okToContinue():            return        dialog = newimagedlg.NewImageDlg(self)        if dialog.exec_():            self.addRecentFile(self.filename)            self.image = QImage()            for action, check in self.resetableActions:                action.setChecked(check)            self.image = dialog.image()            self.filename = None            self.dirty = True            self.showImage()            self.sizeLabel.setText("{0} x {1}".format(self.image.width(),                                                      self.image.height()))            self.updateStatus("Created new image")            def fileOpen(self):        if not self.okToContinue():            return        dir = (os.path.dirname(self.filename)               if self.filename is not None else ".")        formats = (["*.{0}".format(format.data().decode("ascii").lower())                for format in QImageReader.supportedImageFormats()])        fname,tpye = QFileDialog.getOpenFileName(self,                "Image Changer - Choose Image", dir,                "Image files ({0})".format(" ".join(formats)))        if fname:            self.loadFile(True,fname)            def fileSave(self):        if self.image.isNull():            return True        if self.filename is None:            return self.fileSaveAs()        else:            if self.image.save(self.filename, None):                self.updateStatus("Saved as {0}".format(self.filename))                self.dirty = False                return True            else:                self.updateStatus("Failed to save {0}".format(                                  self.filename))                return False    def fileSaveAs(self):        if self.image.isNull():            return True        fname = self.filename if self.filename is not None else "."        formats = (["*.{0}".format(format.data().decode("ascii").lower())                for format in QImageWriter.supportedImageFormats()])        fname,tpye = QFileDialog.getSaveFileName(self,                "Image Changer - Save Image", fname,                "Image files ({0})".format(" ".join(formats)))        if fname:            if "." not in fname:                fname += ".png"            self.addRecentFile(fname)            self.filename = fname            return self.fileSave()        return False            def filePrint(self):        if self.image.isNull():            return        if self.printer is None:            self.printer = QPrinter(QPrinter.HighResolution)            self.printer.setPageSize(QPrinter.Letter)        form = QPrintDialog(self.printer, self)        if form.exec_():            painter = QPainter(self.printer)            rect = painter.viewport()            size = self.image.size()            size.scale(rect.size(), Qt.KeepAspectRatio)            painter.setViewport(rect.x(), rect.y(), size.width(),                                size.height())            painter.drawImage(0, 0, self.image)            def loadFile(self,actiontrigger=False,fname=None):        if fname is None:            action = self.sender()            if isinstance(action, QAction):                fname = str(action.data())                if not self.okToContinue():                    return            else:                return        print(fname)        if fname:            self.filename = None            image = QImage(fname)            if image.isNull():                message = "Failed to read {0}".format(fname)            else:                self.addRecentFile(fname)                self.image = QImage()                for action, check in self.resetableActions:                    action.setChecked(check)                self.image = image                self.filename = fname                self.showImage()                self.dirty = False                self.sizeLabel.setText("{0} x {1}".format(                                       image.width(), image.height()))                message = "Loaded {0}".format(os.path.basename(fname))            self.updateStatus(message)          def loadInitialFile(self):        settings = QSettings()        fname = str(settings.value("LastFile"))        if fname and QFile.exists(fname):            self.loadFile(fname)    def addRecentFile(self, fname):        if fname is None:            return        if fname not in self.recentFiles:            self.recentFiles.insert(0,fname)            while len(self.recentFiles) > 9:                self.recentFiles.pop()    def updateStatus(self, message):        self.statusBar().showMessage(message, 5000)        self.listWidget.addItem(message)        if self.filename is not None:            self.setWindowTitle("Image Changer - {0}[*]".format(                                os.path.basename(self.filename)))        elif not self.image.isNull():            self.setWindowTitle("Image Changer - Unnamed[*]")        else:            self.setWindowTitle("Image Changer[*]")        self.setWindowModified(self.dirty)    def editInvert(self, on):        if self.image.isNull():            return        self.image.invertPixels()        self.showImage()        self.dirty = True        self.updateStatus("Inverted" if on else "Uninverted")    def editSwapRedAndBlue(self, on):        if self.image.isNull():            return        self.image = self.image.rgbSwapped()        self.showImage()        self.dirty = True        self.updateStatus(("Swapped Red and Blue"                           if on else "Unswapped Red and Blue"))    def editZoom(self):        if self.image.isNull():            return        percent, ok = QInputDialog.getInt(self,                "Image Changer - Zoom", "Percent:",                self.zoomSpinBox.value(), 1, 400)        if ok:            self.zoomSpinBox.setValue(percent)    def editUnMirror(self, on):        if self.image.isNull():            return        if self.mirroredhorizontally:            self.editMirrorHorizontal(False)        if self.mirroredvertically:            self.editMirrorVertical(False)    def editMirrorHorizontal(self, on):        if self.image.isNull():            return        self.image = self.image.mirrored(True, False)        self.showImage()        self.mirroredhorizontally = not self.mirroredhorizontally        self.dirty = True        self.updateStatus(("Mirrored Horizontally"                           if on else "Unmirrored Horizontally"))    def editMirrorVertical(self, on):        if self.image.isNull():            return        self.image = self.image.mirrored(False, True)        self.showImage()        self.mirroredvertically = not self.mirroredvertically        self.dirty = True        self.updateStatus(("Mirrored Vertically"                           if on else "Unmirrored Vertically"))               def editResize(self):        if self.image.isNull():            return        form = resizedlg.ResizeDlg(self.image.width(),                                   self.image.height(), self)        if form.exec_():            width, height = form.result()            if (width == self.image.width() and                height == self.image.height()):                self.statusBar().showMessage("Resized to the same size",                                             5000)            else:                self.image = self.image.scaled(width, height)                self.showImage()                self.dirty = True                size = "{0} x {1}".format(self.image.width(),                                          self.image.height())                self.sizeLabel.setText(size)                self.updateStatus("Resized to {0}".format(size))    def helpAbout(self):        QMessageBox.about(self, "About Image Changer",                """<b>Image Changer</b> v {0}                <p>Copyright &copy; 2008-9 Qtrac Ltd.                 All rights reserved.                <p>This application can be used to perform                simple image manipulations.                <p>Python {1} - Qt {2} - PyQt {3} on {4}""".format(                __version__, platform.python_version(),                QT_VERSION_STR, PYQT_VERSION_STR,                platform.system()))    def helpHelp(self):        form = helpform.HelpForm("index.html", self)        form.show()    def showImage(self, percent=None):        if self.image.isNull():            return        if percent is None:            percent = self.zoomSpinBox.value()        factor = percent / 100.0        width = self.image.width() * factor        height = self.image.height() * factor        image = self.image.scaled(width, height, Qt.KeepAspectRatio)        self.imageLabel.setPixmap(QPixmap.fromImage(image))    def closeEvent(self, event):        if self.okToContinue():            settings = QSettings("MyCompany", "MyApp")            settings.setValue("LastFile", self.filename)            settings.setValue("RecentFiles", self.recentFiles)            settings.setValue("MainWindow/Geometry",self.saveGeometry())            settings.setValue("MainWindow/State", self.saveState())        else:            event.ignore()if __name__ == "__main__":    app = QApplication(sys.argv)    form = MainWindow()    form.show()    app.exec_()
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运行结果：