Eric6与pyqt5学习笔记 9【QFileDialog及BUG如何处理，读取文件内容】

标准文件打开保存框QFileDialog

• 单个文件打开 QFileDialog.getOpenFileName()

• 多个文件打开 QFileDialog.getOpenFileNames()

• 文件夹选取 QFileDialog.getExistingDirectory()

• 文件保存 QFileDialog.getSaveFileName()

from PyQt5 import QtWidgets  
from PyQt5.QtWidgets import QFileDialog  

class MyWindow(QtWidgets.QWidget):  
def __init__(self):  
        super(MyWindow,self).__init__()  
        self.myButton = QtWidgets.QPushButton(self)  
        self.myButton.setObjectName("myButton")  
        self.myButton.setText("Test")  
        self.myButton.clicked.connect(self.msg)  

def msg(self):  
        directory1 = QFileDialog.getExistingDirectory(self,  
"选取文件夹",  
"C:/")                                 #起始路径 
        print(directory1)  

        fileName1, filetype = QFileDialog.getOpenFileName(self,  
"选取文件",  
"C:/",  
"All Files (*);;Text Files (*.txt)")   #设置文件扩展名过滤,注意用双分号间隔 
        print(fileName1,filetype)  

        files, ok1 = QFileDialog.getOpenFileNames(self,  
"多文件选择",  
"C:/",  
"All Files (*);;Text Files (*.txt)")  
        print(files,ok1)  

        fileName2, ok2 = QFileDialog.getSaveFileName(self,  
"文件保存",  
"C:/",  
"All Files (*);;Text Files (*.txt)")  

if __name__=="__main__":    
import sys    

    app=QtWidgets.QApplication(sys.argv)    
    myshow=MyWindow()  
    myshow.show()  
    sys.exit(app.exec_()) 

报错处理

自己实际开发中遇到了

>>> Exception "unhandled TypeError"
getOpenFileName(parent: QWidget = None, caption: str = '', directory: str = '', filter: str = '', initialFilter: str = '', options: Union[QFileDialog.Options, QFileDialog.Option] = 0): argument 1 has unexpected type 'Ui_MainWindow'
File: F:\GitHub\RSAsoftware\Ui_index.py, Line: 73

这种报错，百度google了一番并未找到解决方法，有人说参数不对应，但查看文档手册，参数没问题，最后解决办法，将self.action.triggered.connect(self.openFile) 单独弄出来，原理未知，具体代码可参考下述博客形式：
pyqt5 实现 下拉菜单 + 打开文件

读取文件内容

fileName1, filetype1 = QFileDialog.getOpenFileName(self,  "选取文件",  "C:/",  "All Files (*);;Text Files (*.txt)")   #设置文件扩展名过滤,注意用双分号间隔 
#print(fileName1,filetype1)
file = open(fileName1,'r')
data = file.read()
file.close()
self.textEdit.setText(data)

获取文件名后使用open去读取