【问题标题】：How to correctly get Unicode text input from QPlainTextEdit? [duplicate]如何从 QPlainTextEdit 正确获取 Unicode 文本输入？ [复制]
【发布时间】：2018-10-15 09:22:01
【问题描述】：

刚刚运行应用程序，我在屏幕上的 QPlainTextEdit 区域得到了正确的结果：

但是当点击按钮Start Simulation并使用QPlainTextEdit.toPlainText()恢复输入时，输出无效：

def handle_first_input_text(self):
    textEdit = self.textEditWidget1.toPlainText()
    print( "%s", textEdit )

此外，当尝试从图像中检索 Delta δ 时，会抛出此错误：

Traceback (most recent call last):
  File "main.py", line 57, in handle_first_input_text
    print( "%s", textEdit )
  File "F:\Python\lib\encodings\cp1252.py", line 19, in encode
    return codecs.charmap_encode(input,self.errors,encoding_table)[0]
UnicodeEncodeError: 'charmap' codec can't encode character '\u03b4' in position 11: character maps to <undefined>

如何从QPlainTextEdit 正确检索输入？这是错误的最小代码，只需点击 Start Simulation 并查找控制台输出。

#! /usr/bin/env python
# -*- coding: utf-8 -*-

import sys

from PyQt5 import QtGui
from PyQt5 import QtWidgets

from PyQt5.QtGui import *
from PyQt5.QtCore import *
from PyQt5.QtWidgets import *

def main():
    app = QtWidgets.QApplication(sys.argv)
    programWindow = ProgramWindow()

    programWindow.show()
    sys.exit(app.exec_())


class ProgramWindow(QtWidgets.QMainWindow):

    def __init__(self):
        QtWidgets.QMainWindow.__init__(self)
        self.setup_main_window()
        self.first_input_text()
        self.set_window_layout()

    def setup_main_window(self):
        self.resize( 800, 600 )
        self.centralwidget = QWidget()
        self.setCentralWidget( self.centralwidget )

    def first_input_text(self):
        self.textEditWidget1 = QPlainTextEdit( self )
        self.startSimulationButton1 = QPushButton( "Start Simulation" )

        self.textEditWidget1.document().setPlainText( " # Writing δ some ç é ã õ")
        self.startSimulationButton1.clicked.connect( self.handle_first_input_text )

        verticalInnerLayout = QVBoxLayout()
        verticalInnerLayout.addWidget( self.startSimulationButton1 )

        horizontalInnerLayout = QHBoxLayout()
        horizontalInnerLayout.addLayout( verticalInnerLayout )
        horizontalInnerLayout.addWidget( self.textEditWidget1 )

        self.groupBox1 = QGroupBox( "First Group" )
        self.groupBox1.setLayout( horizontalInnerLayout )

    def set_window_layout(self):
        main_vertical_layout = QVBoxLayout( self.centralwidget )
        main_vertical_layout.addWidget( self.groupBox1 )

    def handle_first_input_text(self):
        textEdit = self.textEditWidget1.toPlainText()
        print( "%s", textEdit )

if __name__ == "__main__":
    main()

回答

这个问题不是UnicodeEncodeError: 'charmap' codec can't encode characters的重复问题

另外，下面的这些答案都不是这个问题的答案。

要解决这个问题，我需要添加

.encode("utf-8").decode('cp1252')

不仅如此

.encode("utf-8")

这是固定版本：

def handle_first_input_text(self):
    textEdit = self.textEditWidget1.toPlainText().encode("utf-8").decode('cp1252')
    print( "%s", textEdit )

完整代码：

#! /usr/bin/env python
# -*- coding: utf-8 -*-

import sys

from PyQt5 import QtGui
from PyQt5 import QtWidgets

from PyQt5.QtGui import *
from PyQt5.QtCore import *
from PyQt5.QtWidgets import *

def main():
    app = QtWidgets.QApplication(sys.argv)
    programWindow = ProgramWindow()

    programWindow.show()
    sys.exit(app.exec_())


class ProgramWindow(QtWidgets.QMainWindow):

    def __init__(self):
        QtWidgets.QMainWindow.__init__(self)
        self.setup_main_window()
        self.first_input_text()
        self.set_window_layout()

    def setup_main_window(self):
        self.resize( 800, 600 )
        self.centralwidget = QWidget()
        self.setCentralWidget( self.centralwidget )

    def first_input_text(self):
        self.textEditWidget1 = QPlainTextEdit( self )
        self.startSimulationButton1 = QPushButton( "Start Simulation" )

        self.textEditWidget1.document().setPlainText( " # Writing δ some ç é ã õ")
        self.startSimulationButton1.clicked.connect( self.handle_first_input_text )

        verticalInnerLayout = QVBoxLayout()
        verticalInnerLayout.addWidget( self.startSimulationButton1 )

        horizontalInnerLayout = QHBoxLayout()
        horizontalInnerLayout.addLayout( verticalInnerLayout )
        horizontalInnerLayout.addWidget( self.textEditWidget1 )

        self.groupBox1 = QGroupBox( "First Group" )
        self.groupBox1.setLayout( horizontalInnerLayout )

    def set_window_layout(self):
        main_vertical_layout = QVBoxLayout( self.centralwidget )
        main_vertical_layout.addWidget( self.groupBox1 )

    def handle_first_input_text(self):
        textEdit = self.textEditWidget1.toPlainText().encode("utf-8").decode('cp1252')
        print( "%s", textEdit )

if __name__ == "__main__":
    main()

【问题讨论】：

标签： python python-3.x qt encoding pyqt5

【解决方案1】：

试试看：

import sys
import os

from PyQt5 import QtGui
from PyQt5 import QtWidgets

from PyQt5.QtGui import *
from PyQt5.QtCore import *
from PyQt5.QtWidgets import *

def main():
    app = QtWidgets.QApplication(sys.argv)
    programWindow = ProgramWindow()

    programWindow.show()
    sys.exit(app.exec_())


class ProgramWindow(QtWidgets.QMainWindow):

    def __init__(self):
        QtWidgets.QMainWindow.__init__(self)
        self.setup_main_window()
        self.first_input_text()
        self.set_window_layout()

    def setup_main_window(self):
        self.resize( 800, 600 )
        self.centralwidget = QWidget()
        self.setCentralWidget( self.centralwidget )

    def first_input_text(self):
        self.textEditWidget1 = QPlainTextEdit( self )
        self.startSimulationButton1 = QPushButton( "Start Simulation" )

        self.textEditWidget1.document().setPlainText( " # Writing δ some ç é ã õ")
        self.startSimulationButton1.clicked.connect( self.handle_first_input_text )

        verticalInnerLayout = QVBoxLayout()
        verticalInnerLayout.addWidget( self.startSimulationButton1 )

        horizontalInnerLayout = QHBoxLayout()
        horizontalInnerLayout.addLayout( verticalInnerLayout )
        horizontalInnerLayout.addWidget( self.textEditWidget1 )

        self.groupBox1 = QGroupBox( "First Group" )
        self.groupBox1.setLayout( horizontalInnerLayout )

    def set_window_layout(self):
        main_vertical_layout = QVBoxLayout( self.centralwidget )
        main_vertical_layout.addWidget( self.groupBox1 )

    def handle_first_input_text(self):
        textEdit = self.textEditWidget1.toPlainText()
        #print( "%s" % textEdit)
        os.system('echo ' + textEdit)

if __name__ == "__main__":
    main()

【讨论】：

【解决方案2】：

在handle_first_input_text函数中：

将print( "%s", textEdit ) 行更改为print( "{0:s}".format(textEdit))
这使用 Python 3 的 .format 迷你语言。 Link to Docs

最终代码：

def handle_first_input_text(self):
        textEdit = self.textEditWidget1.toPlainText()
        print( "{0:s}".format(textEdit))

【讨论】：