pyqt5加载pdf文档失败

import sys
from PyQt5.QtWidgets import QApplication, QMainWindow, QFileDialog
from PyPDF2 import PdfFileReader, PdfFileWriter
from main_form import *


class MyWindow(QMainWindow, Ui_MainWindow):
    def __init__(self, parent=None):
        super(MyWindow, self).__init__(parent)
        self.setupUi(self)
        self.actionLoad_File_L.triggered.connect(self.showDialog)

    def showDialog(self):
        infn = QFileDialog.getOpenFileName(self,
                                            'Open file',
                                            'd:')

        with open(infn, 'rb') as f:
            pdf = PdfFileReader(f)
            info = pdf.getDocumentInfo()
            number_of_pages = pdf.getNumPages()

        print(info, number_of_pages)


if __name__ == '__main__':
    app = QApplication(sys.argv)
    win = MyWindow()
    win.show()
    sys.exit(app.exec_())

原因是getOpenFileName的返回值是文件名文件类型的元组，这里直接把元组赋值给了open函数，但是应该是文件名，自己对于代码基础原理不够理解，实际实例代码都有写

infn = QFileDialog.getOpenFileName(self,
                                            'Open file',
                                            'd:')[0]

我没有仔细观察，花了1个小时解决这个问题
pycharm没有报这个错误，到命令行运行可以很清晰的看到这个错误，pycharm假死，所以pycharm也不可靠啊

所以可以像下面这样写

import sys
from PyQt5.QtWidgets import QApplication, QMainWindow, QFileDialog
from PyPDF2 import PdfFileReader, PdfFileWriter
from main_form import *


class MyWindow(QMainWindow, Ui_MainWindow):
    def __init__(self, parent=None):
        super(MyWindow, self).__init__(parent)
        self.setupUi(self)
        self.actionLoad_File_L.triggered.connect(self.get_info)

    def get_info(self):
        path = 'D:/coding/envs/brisspython/a.pdf'
        filename, filetype = QFileDialog.getOpenFileName(self, 'Open file')
        with open(filename, 'rb') as f:
            pdf = PdfFileReader(f)
            info = pdf.getDocumentInfo()
            number_of_pages = pdf.getNumPages()

        print(number_of_pages)

 


if __name__ == '__main__':
    app = QApplication(sys.argv)
    win = MyWindow()
    win.show()
    sys.exit(app.exec_())

或者

import sys
from PyQt5.QtWidgets import QApplication, QMainWindow, QFileDialog
from PyPDF2 import PdfFileReader, PdfFileWriter
from main_form import *


class MyWindow(QMainWindow, Ui_MainWindow):
    def __init__(self, parent=None):
        super(MyWindow, self).__init__(parent)
        self.setupUi(self)
        self.actionLoad_File_L.triggered.connect(self.get_info)

    def get_info(self):
        path = 'D:/coding/envs/brisspython/a.pdf'
        filename = QFileDialog.getOpenFileName(self, 'Open file')[0]
        with open(filename, 'rb') as f:
            pdf = PdfFileReader(f)
            info = pdf.getDocumentInfo()
            number_of_pages = pdf.getNumPages()

        print(number_of_pages)

   


if __name__ == '__main__':
    app = QApplication(sys.argv)
    win = MyWindow()
    win.show()
    sys.exit(app.exec_())