PyQt项目实战1

实战1"/>

PyQt项目实战1

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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、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。

from PyQt5 import QtCore, QtGui, QtWidgets
from PyQt5.QtWidgets import QFileDialog, QApplicationclass Ui_MainWindow(object):def setupUi(self, MainWindow):MainWindow.setObjectName("MainWindow")MainWindow.resize(800, 600)self.centralwidget = QtWidgets.QWidget(MainWindow)self.centralwidget.setObjectName("centralwidget")# pushButton_openImageself.pushButton_openImage = QtWidgets.QPushButton(self.centralwidget)self.pushButton_openImage.setGeometry(QtCore.QRect(60, 40, 75, 23))self.pushButton_openImage.setObjectName("pushButton_openImage")# pushButton_openImageself.pushButton_saveImage = QtWidgets.QPushButton(self.centralwidget)self.pushButton_saveImage.setGeometry(QtCore.QRect(60, 90, 75, 23))self.pushButton_saveImage.setObjectName("pushButton_saveImage")# pushButton_openImageself.pushButton_openDirectory = QtWidgets.QPushButton(self.centralwidget)self.pushButton_openDirectory.setGeometry(QtCore.QRect(60, 200, 75, 23))self.pushButton_openDirectory.setObjectName("pushButton_openDirectory")# pushButton_openFileself.pushButton_openFile = QtWidgets.QPushButton(self.centralwidget)self.pushButton_openFile.setGeometry(QtCore.QRect(60, 280, 75, 23))self.pushButton_openFile.setObjectName("pushButton_openFile")# pushButton_saveImageself.pushButton_saveFile = QtWidgets.QPushButton(self.centralwidget)self.pushButton_saveFile.setGeometry(QtCore.QRect(60, 340, 75, 23))self.pushButton_saveFile.setObjectName("pushButton_saveFile")self.label_imagePath = QtWidgets.QLabel(self.centralwidget)self.label_imagePath.setGeometry(QtCore.QRect(600, 80, 54, 12))self.label_imagePath.setObjectName("label_imagePath")self.label_directoryPath = QtWidgets.QLabel(self.centralwidget)self.label_directoryPath.setGeometry(QtCore.QRect(170, 210, 54, 12))self.label_directoryPath.setObjectName("label_directoryPath")self.label_filePath = QtWidgets.QLabel(self.centralwidget)self.label_filePath.setGeometry(QtCore.QRect(170, 290, 54, 12))self.label_filePath.setObjectName("label_filePath")self.label_txt = QtWidgets.QLabel(self.centralwidget)self.label_txt.setGeometry(QtCore.QRect(170, 339, 281, 161))self.label_txt.setStyleSheet("border: 1px solid black;")self.label_txt.setObjectName("label_txt")self.label_image = QtWidgets.QLabel(self.centralwidget)self.label_image.setGeometry(QtCore.QRect(170, 30, 281, 131))self.label_image.setStyleSheet("border: 1px solid black;")self.label_image.setObjectName("label_image")self.label_image.raise_()# self.label_image = QtWidgets.QLabel(self.centralwidget)# self.label_image.setGeometry(QtCore.QRect(200, 50, 321, 231))# self.label_image.setFrameShape(QtWidgets.QFrame.Box)# self.label_image.setObjectName("label_image")# self.label_image.setScaledContents(True)  # 图片填充整个框self.pushButton_openImage.raise_()self.pushButton_saveImage.raise_()self.pushButton_openDirectory.raise_()self.pushButton_openFile.raise_()self.pushButton_saveFile.raise_()self.label_imagePath.raise_()self.label_directoryPath.raise_()self.label_filePath.raise_()self.label_txt.raise_()MainWindow.setCentralWidget(self.centralwidget)self.menubar = QtWidgets.QMenuBar(MainWindow)self.menubar.setGeometry(QtCore.QRect(0, 0, 800, 23))self.menubar.setObjectName("menubar")MainWindow.setMenuBar(self.menubar)self.statusbar = QtWidgets.QStatusBar(MainWindow)self.statusbar.setObjectName("statusbar")MainWindow.setStatusBar(self.statusbar)self.retranslateUi(MainWindow)QtCore.QMetaObject.connectSlotsByName(MainWindow)# 关联函数self.pushButton_openImage.clicked.connect(self.openImage)self.pushButton_saveImage.clicked.connect(self.saveImage)self.pushButton_openFile.clicked.connect(self.openTextFile)self.pushButton_saveFile.clicked.connect(self.saveTextFile)self.pushButton_openDirectory.clicked.connect(self.openDirectory)def retranslateUi(self, MainWindow):_translate = QtCore.QCoreApplication.translateMainWindow.setWindowTitle(_translate("MainWindow", "MainWindow"))self.pushButton_openImage.setText(_translate("MainWindow", "打开图像"))self.pushButton_saveImage.setText(_translate("MainWindow", "保存图像"))self.pushButton_openDirectory.setText(_translate("MainWindow", "打开文件夹"))self.pushButton_openFile.setText(_translate("MainWindow", "打开文件"))self.pushButton_saveFile.setText(_translate("MainWindow", "保存文件"))self.label_imagePath.setText(_translate("MainWindow", "图片路径"))self.label_directoryPath.setText(_translate("MainWindow", "文件夹路径"))self.label_filePath.setText(_translate("MainWindow", "文件路径"))self.label_txt.setText(_translate("MainWindow", "文本内容"))self.label_image.setText(_translate("MainWindow", "图片"))'''1.打开本地图片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'''def openImage(self):  # 选择本地图片上传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imgName, imgType = QFileDialog.getOpenFileName(self.centralwidget, "打开图片", "","*.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jpg = QtGui.QPixmap(imgName).scaled(self.label_image.width(),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'''2.保存图片到本地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）'''def saveImage(self):  # 保存图片到本地screen = QApplication.primaryScreen()pix = screen.grabWindow(self.label_image.winId())fd, type = QFileDialog.getSaveFileName(self.centralwidget, "保存图片", "", "*.jpg;;*.png;;All Files(*)")pix.save(fd)'''3.打开文件夹'''def openDirectory(self):  # 打开文件夹（目录）fd = QFileDialog.getExistingDirectory(self.centralwidget, "选择文件夹", "")self.label_directoryPath.setText(fd)'''4.打开本地文本文件并显示'''def openTextFile(self):  # 选择文本文件上传fd, fp = QFileDialog.getOpenFileName(self.centralwidget, "选择文件", "", "*.txt;;All Files(*)")f = open(fd, 'r')self.label_txt.setText(f.read())self.label_filePath.setText(fd)f.close()'''5.保存文本到本地'''def saveTextFile(self):  # 保存文本文件fd, fp = QFileDialog.getSaveFileName(self.centralwidget, "保存文件", "", "*.txt;;All Files(*)")f = open(fd, 'w')f.write(self.label_txt.text())f.close()if __name__ == "__main__":import sysapp = QtWidgets.QApplication(sys.argv)formObj = QtWidgets.QMainWindow()ui = Ui_MainWindow()ui.setupUi(formObj)formObj.show()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