我这里有一个简单的PyQt5应用程序，可以将Pdf转换为excel。当我单击转换按钮时，我想在下面的转换方法中添加一个进度条，因为这需要一些时间来执行，因此具有一些可视化效果将非常好。
以下是我的代码：
我正在从Qtdesigner加载ui。另外，我可以在可以附加到pushButton_3的位置添加进度条。进度栏可以称为“ ProgressBar”。请让我知道您如何完成此任务，因为此处的大多数答案并未真正回答该问题。
import sys
from PyQt5.QtWidgets import QMainWindow,QApplication,QTableView, QWidget, QFileDialog,QPushButton,QVBoxLayout,QMessageBox
from PyQt5 import uic
from PyPDF2 import PdfFileReader
from PyQt5 import QtCore,QtGui
import pandas as pd
import tabula
import re
from PandasModel import PandasModel
class App(QMainWindow):
def __init__(self):
QWidget.__init__(self)
uic.loadUi('designUI.ui',self)
self.pushButton.clicked.connect(self.openFileNameDialog)
self.pushButton_3.clicked.connect(self.convert)
self.pushButton_2.clicked.connect(self.view)
self.pushButton_4.clicked.connect(self.saveFileDialog)
def openFileNameDialog(self):
options = QFileDialog.Options()
options |= QFileDialog.DontUseNativeDialog
fileName, _ = QFileDialog.getOpenFileName(self,"Open File", "","All Files (*);;Python Files (*.py)")#, options=options)
if fileName:
self.file=fileName
def view(self):
model=PandasModel(self.converted_file)
self.tableView.setModel(model)
def convert(self):
self.converted_file=self.pdf2excel(self.file)
def saveFileDialog(self):
options = QFileDialog.Options()
options |= QFileDialog.DontUseNativeDialog
fileName, _ = QFileDialog.getSaveFileName(self, 'Save File', '', ".xls(*.xls)")
if fileName:
self.converted_file.to_excel(fileName)
msg=QMessageBox()
msg.setText('File is Saved')
msg.setStandardButtons(QMessageBox.Ok)
#msg.buttonClicked.connect(msgbtn)
msg.exec_()
def pdf2excel(self,pdf_file):
pdf = PdfFileReader(open(pdf_file,'rb'))
length=pdf.getNumPages()
result=pd.DataFrame(columns=['Department','Employment No','Employment Name',"Hire Date","Term Date","Birth Date",
"Seniority Date","Pay Code","FT/PT/S","Status"])
page=1
while page <= length:
df=tabula.read_pdf(pdf_file, pages = str(page),lattice =True, area=(75.775,16.0,572.715,779.29))[1:]
pattern = re.compile(r'(\s){2,}')
df=pd.DataFrame(df[df.columns[0]].replace(pattern,","))
df=df['Unnamed: 0'].str.split(",",expand=True)
df=df.rename(columns={0:'Department',
1:'Employment No',2:'Employment Name',3:"Hire Date",4:"Term Date",5:"Birth Date",
6:"Seniority Date",7:"Pay Code",8:"FT/PT/S",9:"Status"})
result=result.append(df,ignore_index=True)
page+=1
result["Hire Date"]=pd.to_datetime(result["Hire Date"])
result["Term Date"]=pd.to_datetime(result["Term Date"])
result["Days Difference"]=(result['Term Date']-result['Hire Date']).dt.days
result=result.dropna(how='all')
result=result.drop(columns=['Birth Date','Pay Code','Status'])
result=result[['Department','Employment No','Employment Name',"Hire Date","Term Date","Days Difference",
"Seniority Date","FT/PT/S"]]
return result
if __name__ == '__main__':
app = QApplication(sys.argv)
app.setWindowIcon(QtGui.QIcon('pdf-to-excel-icon.png'))
ex = App()
ex.show()
sys.exit(app.exec_())
答案 0 :(得分：3)
首先，我建议验证变量是否存在或具有一定的大小，例如，尝试将您的代码与任何pdf一起使用时，您的代码已损坏。
问题所在，当您运行pdf2excel时，您将看到您无法更改窗口的大小，因为GUI已冻结，因此它必须在另一个线程上运行，并通过信号将信息作为进度和数据帧发送。在这种情况下，我将创建一个worker（QObject），它将驻留在另一个具有pdf2excel函数的线程中。
import sys
from functools import partial
from PyQt5 import QtCore, QtGui, QtWidgets, uic
from PyPDF2 import PdfFileReader
import pandas as pd
import tabula
import re
from PandasModel import PandasModel
class PdfObject(QtCore.QObject):
progressChanged = QtCore.pyqtSignal(int)
maximumChanged = QtCore.pyqtSignal(int)
pandasChanged = QtCore.pyqtSignal(pd.DataFrame)
@QtCore.pyqtSlot(str)
def pdf2excel(self, pdf_file):
pdf = PdfFileReader(open(pdf_file, "rb"))
length = pdf.getNumPages()
result = pd.DataFrame(
columns=[
"Department",
"Employment No",
"Employment Name",
"Hire Date",
"Term Date",
"Birth Date",
"Seniority Date",
"Pay Code",
"FT/PT/S",
"Status",
]
)
self.maximumChanged.emit(length)
page = 1
while page <= length:
self.progressChanged.emit(page)
df = tabula.read_pdf(
pdf_file,
pages=str(page),
lattice=True,
area=(75.775, 16.0, 572.715, 779.29),
)[1:]
pattern = re.compile(r"(\s){2,}")
df = pd.DataFrame(df[df.columns[0]].replace(pattern, ","))
df = df["Unnamed: 0"].str.split(",", expand=True)
df = df.rename(
columns={
0: "Department",
1: "Employment No",
2: "Employment Name",
3: "Hire Date",
4: "Term Date",
5: "Birth Date",
6: "Seniority Date",
7: "Pay Code",
8: "FT/PT/S",
9: "Status",
}
)
result = result.append(df, ignore_index=True)
page += 1
result["Hire Date"] = pd.to_datetime(result["Hire Date"])
result["Term Date"] = pd.to_datetime(result["Term Date"])
result["Days Difference"] = (
result["Term Date"] - result["Hire Date"]
).dt.days
result = result.dropna(how="all")
result = result.drop(columns=["Birth Date", "Pay Code", "Status"])
result = result[
[
"Department",
"Employment No",
"Employment Name",
"Hire Date",
"Term Date",
"Days Difference",
"Seniority Date",
"FT/PT/S",
]
]
self.pandasChanged.emit(result)
class App(QtWidgets.QMainWindow):
def __init__(self, parent=None):
super(App, self).__init__(parent)
uic.loadUi("designUI.ui", self)
self.filename = ""
self.converted_file = None
thread = QtCore.QThread(self)
thread.start()
self.pdf_object = PdfObject()
self.pdf_object.moveToThread(thread)
self.pdf_object.maximumChanged.connect(self.progressBar.setMaximum)
self.pdf_object.progressChanged.connect(self.progressBar.setValue)
self.pdf_object.pandasChanged.connect(self.on_pandasChanged)
self.pushButton.clicked.connect(self.openFileNameDialog)
self.pushButton_3.clicked.connect(self.convert)
self.pushButton_2.clicked.connect(self.view)
self.pushButton_4.clicked.connect(self.saveFileDialog)
def openFileNameDialog(self):
options = QtWidgets.QFileDialog.Options()
options |= QtWidgets.QFileDialog.DontUseNativeDialog
fileName, _ = QtWidgets.QFileDialog.getOpenFileName(
self, "Open File", "", "All Files (*);;Python Files (*.py)"
) # , options=options)
if fileName:
self.filename = fileName
def view(self):
if self.converted_file is not None:
model = PandasModel(self.converted_file)
self.tableView.setModel(model)
def convert(self):
if self.filename:
wrapper = partial(self.pdf_object.pdf2excel, self.filename)
QtCore.QTimer.singleShot(0, wrapper)
@QtCore.pyqtSlot(pd.DataFrame)
def on_pandasChanged(self, df):
self.converted_file = df.copy()
def saveFileDialog(self):
options = QtWidgets.QFileDialog.Options()
options |= QtWidgets.QFileDialog.DontUseNativeDialog
fileName, _ = QtWidgets.QFileDialog.getSaveFileName(
self, "Save File", "", ".xls(*.xls)"
)
if fileName and self.converted_file is not None:
self.converted_file.to_excel(fileName)
msg = QtWidgets.QMessageBox()
msg.setText("File is Saved")
msg.setStandardButtons(QtWidgets.QMessageBox.Ok)
# msg.buttonClicked.connect(msgbtn)
msg.exec_()
if __name__ == "__main__":
app = QtWidgets.QApplication(sys.argv)
app.setWindowIcon(QtGui.QIcon("pdf-to-excel-icon.png"))
ex = App()
ex.show()
sys.exit(app.exec_())