Pyqt print输出到控件中小demo

用pyqt做GUI的时候，涉及到日志功能，希望把print的东西输出到某个控件中，如QTextEdit()中。

but how？

根据stackoverflow的大神回复，我们可以写出如下代码：

# #coding:utf-8  from PyQt4 import QtGuifrom PyQt4 import QtCorefrom PyQt4.QtWebKit import*from PyQt4 import QtCore, QtGuifrom PyQt4 import uicfrom PyQt4.QtCore import *from PyQt4.QtGui import *from PyQt4.QtWebKit import *from PyQt4.QtNetwork import *import sysreload(sys)sys.setdefaultencoding('utf-8')class MyConsole(QWidget):    def __init__(self,parent):        QWidget.__init__(self)        self.parent = parent                self.initUI()            #初始化UI        def initUI(self):        self.gridlayout = QtGui.QGridLayout()                 #设置出20 x 20 的格局        for i in range(20):            self.gridlayout.setColumnStretch(i,1)            self.gridlayout.setRowStretch(i,1)        lb1 = QLabel(u'账户：')        lb2 = QLabel(u'密码：')        self.userEntry = QLineEdit()        self.passEntry = QLineEdit()        self.passEntry.setEchoMode(QLineEdit.Password)        self.loginBtn = QtGui.QPushButton(u"登录")        self.loginBtn.setFixedSize(40,20)        self.connect(self.loginBtn, QtCore.SIGNAL('clicked()'), self.onLoginButton)                self.gridlayout.addWidget(lb1, 0, 0)        self.gridlayout.addWidget(lb2, 1, 0)        self.gridlayout.addWidget(self.userEntry, 0, 1,1,3)        self.gridlayout.addWidget(self.passEntry, 1, 1,1,3)        self.gridlayout.addWidget(self.loginBtn, 0, 4,1,2)                self.setLayout(self.gridlayout)         #响应登录按钮    def onLoginButton(self):        username = self.userEntry.text()        password = self.passEntry.text()        QtGui.QMessageBox.about(self, username+u'登录成功', u"密码是："+password)        print username+u'登录成功', u"密码是："+password        class EmittingStream(QtCore.QObject):        textWritten = QtCore.pyqtSignal(str)        def write(self, text):            self.textWritten.emit(str(text)) class MainWindow(QtGui.QMainWindow):    def __init__(self,parent=None):        QtGui.QMainWindow.__init__(self, parent)        tabs = QtGui.QTabWidget(self)        #tab1        tab1 = QtGui.QWidget()            vbox = QtGui.QVBoxLayout()        console = MyConsole(self)        vbox.addWidget(console)        tab1.setLayout(vbox)                #tab2        self.tab2 = QTextEdit()                tabs.addTab(tab1,u"控制台")        tabs.addTab(self.tab2,u"日志输出")                tabs.resize(500, 350)        self.resize(500, 350)                #禁止最大化        self.setWindowFlags(QtCore.Qt.WindowMinimizeButtonHint)          self.show()                #重定向输出        sys.stdout = EmittingStream(textWritten=self.normalOutputWritten)        sys.stderr = EmittingStream(textWritten=self.normalOutputWritten)            def __del__(self):        sys.stdout = sys.__stdout__        sys.stderr = sys.__stderr__            def normalOutputWritten(self, text):        cursor = self.tab2.textCursor()        cursor.movePosition(QtGui.QTextCursor.End)        cursor.insertText(text)        self.tab2.setTextCursor(cursor)        self.tab2.ensureCursorVisible()                    def main():    app = QtGui.QApplication(sys.argv)    win = MainWindow()    sys.exit(app.exec_()) if __name__ == '__main__':    main()

运行结果，发现的确是把print输出到“日志输出”了，可是为何是乱码呢？

在QString 中文乱码中找到解决方案：

在print前加一句：

QTextCodec.setCodecForCStrings(QTextCodec.codecForName("utf-8"))

 最终代码：

# #coding:utf-8  from PyQt4 import QtGuifrom PyQt4 import QtCorefrom PyQt4.QtWebKit import*from PyQt4 import QtCore, QtGuifrom PyQt4 import uicfrom PyQt4.QtCore import *from PyQt4.QtGui import *from PyQt4.QtWebKit import *from PyQt4.QtNetwork import *import sysreload(sys)sys.setdefaultencoding('utf-8')class MyConsole(QWidget):    def __init__(self,parent):        QWidget.__init__(self)        self.parent = parent                self.initUI()            #初始化UI        def initUI(self):        self.gridlayout = QtGui.QGridLayout()                 #设置出20 x 20 的格局        for i in range(20):            self.gridlayout.setColumnStretch(i,1)            self.gridlayout.setRowStretch(i,1)        lb1 = QLabel(u'账户：')        lb2 = QLabel(u'密码：')        self.userEntry = QLineEdit()        self.passEntry = QLineEdit()        self.passEntry.setEchoMode(QLineEdit.Password)        self.loginBtn = QtGui.QPushButton(u"登录")        self.loginBtn.setFixedSize(40,20)        self.connect(self.loginBtn, QtCore.SIGNAL('clicked()'), self.onLoginButton)                self.gridlayout.addWidget(lb1, 0, 0)        self.gridlayout.addWidget(lb2, 1, 0)        self.gridlayout.addWidget(self.userEntry, 0, 1,1,3)        self.gridlayout.addWidget(self.passEntry, 1, 1,1,3)        self.gridlayout.addWidget(self.loginBtn, 0, 4,1,2)                self.setLayout(self.gridlayout)         #响应登录按钮    def onLoginButton(self):        username = self.userEntry.text()        password = self.passEntry.text()        QtGui.QMessageBox.about(self, username+u'登录成功', u"密码是："+password)        QTextCodec.setCodecForCStrings(QTextCodec.codecForName("utf-8"))        print username+u'登录成功！\n' + u"密码是："+password                class EmittingStream(QtCore.QObject):        textWritten = QtCore.pyqtSignal(str)        def write(self, text):            self.textWritten.emit(str(text)) class MainWindow(QtGui.QMainWindow):    def __init__(self,parent=None):        QtGui.QMainWindow.__init__(self, parent)        tabs = QtGui.QTabWidget(self)        #tab1        tab1 = QtGui.QWidget()            vbox = QtGui.QVBoxLayout()        console = MyConsole(self)        vbox.addWidget(console)        tab1.setLayout(vbox)                #tab2        self.tab2 = QTextEdit()                tabs.addTab(tab1,u"控制台")        tabs.addTab(self.tab2,u"日志输出")                tabs.resize(500, 350)        self.resize(500, 350)                #禁止最大化        self.setWindowFlags(QtCore.Qt.WindowMinimizeButtonHint)          self.show()                #重定向输出        sys.stdout = EmittingStream(textWritten=self.normalOutputWritten)        sys.stderr = EmittingStream(textWritten=self.normalOutputWritten)            def __del__(self):        sys.stdout = sys.__stdout__        sys.stderr = sys.__stderr__            def normalOutputWritten(self, text):        cursor = self.tab2.textCursor()        cursor.movePosition(QtGui.QTextCursor.End)        cursor.insertText(text)        self.tab2.setTextCursor(cursor)        self.tab2.ensureCursorVisible()                    def main():    app = QtGui.QApplication(sys.argv)    win = MainWindow()    sys.exit(app.exec_()) if __name__ == '__main__':    main()