• PyQt项目实战1

     转载

    pyqt5:利用QFileDialog从本地选择图片\文本文档显示到label、保存图片\label文本到本地（附代码）_pyqt5中qfiledialog.getopenfileurl-CSDN博客icon-default.png?t=N7T8https://blog.csdn.net/tensixchuan/article/details/1057178331、QtDesigner的控件摆设完成后，可以定义函数设置其功能，再通过关联函数将控件与其对应的函数联系在一起。

    1. from PyQt5 import QtCore, QtGui, QtWidgets
    2. from PyQt5.QtWidgets import QFileDialog, QApplication
    3.  
    4.  
    5. class Ui_MainWindow(object):
    6.     def setupUi(self, MainWindow):
    7.         MainWindow.setObjectName("MainWindow")
    8.         MainWindow.resize(800, 600)
    9.  
    10.         self.centralwidget = QtWidgets.QWidget(MainWindow)
    11.         self.centralwidget.setObjectName("centralwidget")
    12.  
    13.         # pushButton_openImage
    14.         self.pushButton_openImage = QtWidgets.QPushButton(self.centralwidget)
    15.         self.pushButton_openImage.setGeometry(QtCore.QRect(60, 40, 75, 23))
    16.         self.pushButton_openImage.setObjectName("pushButton_openImage")
    17.  
    18.         # pushButton_openImage
    19.         self.pushButton_saveImage = QtWidgets.QPushButton(self.centralwidget)
    20.         self.pushButton_saveImage.setGeometry(QtCore.QRect(60, 90, 75, 23))
    21.         self.pushButton_saveImage.setObjectName("pushButton_saveImage")
    22.  
    23.         # pushButton_openImage
    24.         self.pushButton_openDirectory = QtWidgets.QPushButton(self.centralwidget)
    25.         self.pushButton_openDirectory.setGeometry(QtCore.QRect(60, 200, 75, 23))
    26.         self.pushButton_openDirectory.setObjectName("pushButton_openDirectory")
    27.  
    28.         # pushButton_openFile
    29.         self.pushButton_openFile = QtWidgets.QPushButton(self.centralwidget)
    30.         self.pushButton_openFile.setGeometry(QtCore.QRect(60, 280, 75, 23))
    31.         self.pushButton_openFile.setObjectName("pushButton_openFile")
    32.  
    33.         # pushButton_saveImage
    34.         self.pushButton_saveFile = QtWidgets.QPushButton(self.centralwidget)
    35.         self.pushButton_saveFile.setGeometry(QtCore.QRect(60, 340, 75, 23))
    36.         self.pushButton_saveFile.setObjectName("pushButton_saveFile")
    37.  
    38.         self.label_imagePath = QtWidgets.QLabel(self.centralwidget)
    39.         self.label_imagePath.setGeometry(QtCore.QRect(600, 80, 54, 12))
    40.         self.label_imagePath.setObjectName("label_imagePath")
    41.         self.label_directoryPath = QtWidgets.QLabel(self.centralwidget)
    42.         self.label_directoryPath.setGeometry(QtCore.QRect(170, 210, 54, 12))
    43.         self.label_directoryPath.setObjectName("label_directoryPath")
    44.         self.label_filePath = QtWidgets.QLabel(self.centralwidget)
    45.         self.label_filePath.setGeometry(QtCore.QRect(170, 290, 54, 12))
    46.         self.label_filePath.setObjectName("label_filePath")
    47.  
    48.         self.label_txt = QtWidgets.QLabel(self.centralwidget)
    49.         self.label_txt.setGeometry(QtCore.QRect(170, 339, 281, 161))
    50.         self.label_txt.setStyleSheet("border: 1px solid black;")
    51.         self.label_txt.setObjectName("label_txt")
    52.  
    53.         self.label_image = QtWidgets.QLabel(self.centralwidget)
    54.         self.label_image.setGeometry(QtCore.QRect(170, 30, 281, 131))
    55.         self.label_image.setStyleSheet("border: 1px solid black;")
    56.         self.label_image.setObjectName("label_image")
    57.         self.label_image.raise_()
    58.         # self.label_image = QtWidgets.QLabel(self.centralwidget)
    59.         # self.label_image.setGeometry(QtCore.QRect(200, 50, 321, 231))
    60.         # self.label_image.setFrameShape(QtWidgets.QFrame.Box)
    61.         # self.label_image.setObjectName("label_image")
    62.         # self.label_image.setScaledContents(True)  # 图片填充整个框
    63.  
    64.         self.pushButton_openImage.raise_()
    65.         self.pushButton_saveImage.raise_()
    66.         self.pushButton_openDirectory.raise_()
    67.         self.pushButton_openFile.raise_()
    68.         self.pushButton_saveFile.raise_()
    69.         self.label_imagePath.raise_()
    70.         self.label_directoryPath.raise_()
    71.         self.label_filePath.raise_()
    72.         self.label_txt.raise_()
    73.  
    74.         MainWindow.setCentralWidget(self.centralwidget)
    75.  
    76.         self.menubar = QtWidgets.QMenuBar(MainWindow)
    77.         self.menubar.setGeometry(QtCore.QRect(0, 0, 800, 23))
    78.  
    79.         self.menubar.setObjectName("menubar")
    80.         MainWindow.setMenuBar(self.menubar)
    81.  
    82.         self.statusbar = QtWidgets.QStatusBar(MainWindow)
    83.         self.statusbar.setObjectName("statusbar")
    84.  
    85.         MainWindow.setStatusBar(self.statusbar)
    86.  
    87.         self.retranslateUi(MainWindow)
    88.         QtCore.QMetaObject.connectSlotsByName(MainWindow)
    89.  
    90.         # 关联函数
    91.         self.pushButton_openImage.clicked.connect(self.openImage)
    92.         self.pushButton_saveImage.clicked.connect(self.saveImage)
    93.         self.pushButton_openFile.clicked.connect(self.openTextFile)
    94.         self.pushButton_saveFile.clicked.connect(self.saveTextFile)
    95.         self.pushButton_openDirectory.clicked.connect(self.openDirectory)
    96.  
    97.     def retranslateUi(self, MainWindow):
    98.         _translate = QtCore.QCoreApplication.translate
    99.         MainWindow.setWindowTitle(_translate("MainWindow", "MainWindow"))
    100.         self.pushButton_openImage.setText(_translate("MainWindow", "打开图像"))
    101.         self.pushButton_saveImage.setText(_translate("MainWindow", "保存图像"))
    102.         self.pushButton_openDirectory.setText(_translate("MainWindow", "打开文件夹"))
    103.         self.pushButton_openFile.setText(_translate("MainWindow", "打开文件"))
    104.         self.pushButton_saveFile.setText(_translate("MainWindow", "保存文件"))
    105.         self.label_imagePath.setText(_translate("MainWindow", "图片路径"))
    106.         self.label_directoryPath.setText(_translate("MainWindow", "文件夹路径"))
    107.         self.label_filePath.setText(_translate("MainWindow", "文件路径"))
    108.         self.label_txt.setText(_translate("MainWindow", "文本内容"))
    109.         self.label_image.setText(_translate("MainWindow", "图片"))
    110.  
    111.     '''
    112.     1.打开本地图片
    113.     QFileDialog.getOpenFileName()返回值有两个，第一个是选择文件的文件名（文件路径），我们可以通过这个文件名打开本地文件，第二个是选择文件的类型
    114.     有4个参数，第一个参数一般是self，第2个参数是弹出框的标题，第3个参数是打开对话框的默认地址，第4个参数是过滤字符串，一般用来限制文件类型，定义打开
    115.     文件下拉框中的可选列表，并且不同的文件类型用两个分号;;隔开
    116.     '''
    117.  
    118.     def openImage(self):  # 选择本地图片上传
    119.         global imgName  # 这里为了方便别的地方引用图片路径，我们把它设置为全局变量
    120.         imgName, imgType = QFileDialog.getOpenFileName(self.centralwidget, "打开图片", "",
    121.                                                        "*.jpg;;*.png;;All Files(*)")  # 弹出一个文件选择框，第一个返回值imgName记录选中的文件路径+文件名，第二个返回值imgType记录文件的类型
    122.         jpg = QtGui.QPixmap(imgName).scaled(self.label_image.width(),
    123.                                             self.label_image.height())  # 通过文件路径获取图片文件，并设置图片长宽为label控件的长宽
    124.         self.label_image.setPixmap(jpg)  # 在label控件上显示选择的图片 点击控件选择文件
    125.         self.label_imagePath.setText(imgName)  # 显示所选图片的本地路径 就是大大的黑色方框
    126.  
    127.         '''
    128.     2.保存图片到本地
    129.     首先还是打开一个保存文件的弹出框，然后保存图片到刚刚选择的路径，这里保存有两种思路
    130.     第一种是记录要保存图片原来的路径，获取到图片实例，然后把图片写入选择的路径
    131.     第二种是把图片所在label控件屏幕截图，然后保存截图（我觉得这个比较简单）
    132.     '''
    133.  
    134.     def saveImage(self):  # 保存图片到本地
    135.         screen = QApplication.primaryScreen()
    136.         pix = screen.grabWindow(self.label_image.winId())
    137.         fd, type = QFileDialog.getSaveFileName(self.centralwidget, "保存图片", "", "*.jpg;;*.png;;All Files(*)")
    138.         pix.save(fd)
    139.  
    140.     '''
    141.     3.打开文件夹
    142.     '''
    143.  
    144.     def openDirectory(self):  # 打开文件夹（目录）
    145.         fd = QFileDialog.getExistingDirectory(self.centralwidget, "选择文件夹", "")
    146.         self.label_directoryPath.setText(fd)
    147.  
    148.     '''
    149.     4.打开本地文本文件并显示
    150.     '''
    151.  
    152.     def openTextFile(self):  # 选择文本文件上传
    153.         fd, fp = QFileDialog.getOpenFileName(self.centralwidget, "选择文件", "", "*.txt;;All Files(*)")
    154.         f = open(fd, 'r')
    155.         self.label_txt.setText(f.read())
    156.         self.label_filePath.setText(fd)
    157.         f.close()
    158.  
    159.     '''
    160.     5.保存文本到本地
    161.     '''
    162.  
    163.     def saveTextFile(self):  # 保存文本文件
    164.         fd, fp = QFileDialog.getSaveFileName(self.centralwidget, "保存文件", "", "*.txt;;All Files(*)")
    165.         f = open(fd, 'w')
    166.         f.write(self.label_txt.text())
    167.         f.close()
    168.  
    169.  
    170. if __name__ == "__main__":
    171.     import sys
    172.  
    173.     app = QtWidgets.QApplication(sys.argv)
    174.     formObj = QtWidgets.QMainWindow()
    175.     ui = Ui_MainWindow()
    176.     ui.setupUi(formObj)
    177.     formObj.show()
    178.     sys.exit(app.exec_())

    2.自己设置好后点击按钮没反应的原因是：

    少了这一行代码：

    from PyQt5.QtWidgets import QFileDialog, QApplication

  • 相关阅读:
    手写签名功能（vue3）
    C++基础——多态
    Blueprints - 虚幻中的行为树（Behavior Tree）
    C语言：贪吃蛇游戏（万字解读超详细）
    Python 物联网之用于基于 TinyFlux的物联网和分析应用程序的微型时间序列数据库
    JVS低代码权限管控方式
    “蔚来杯“2022牛客暑期多校训练营6 A题: Array
    Variable-Length Subsequence Clustering in Time Series（TKDE）
    开发工具：推荐一款非常好用的SSH客户端WindTerm
    Datawhale学习笔记AI +新能源：电动汽车充电站充电量预测
  • 原文地址：https://blog.csdn.net/llf000000/article/details/133988725