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 QtGui
from PyQt4 import QtCore
from PyQt4.QtWebKit import*
from PyQt4 import QtCore, QtGui
from PyQt4 import uic
from PyQt4.QtCore import *
from PyQt4.QtGui import *
from PyQt4.QtWebKit import *
from PyQt4.QtNetwork import *
import sys

reload(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 QtGui
from PyQt4 import QtCore
from PyQt4.QtWebKit import*
from PyQt4 import QtCore, QtGui
from PyQt4 import uic
from PyQt4.QtCore import *
from PyQt4.QtGui import *
from PyQt4.QtWebKit import *
from PyQt4.QtNetwork import *
import sys

reload(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()