PyQt5可以使用QWebEngineView在后台打印PDF，没有GUI？

Question

I want to use Python to convert some html files to PDF. After looking at the modules and possibilities to do this, I settled on Qt5.

I have code that works, but it doesn't work exactly how I want. I want to run my program via the command line, and it to exit once finished. Currently, it produces the PDF but stays running.

If I uncomment and show the QWebEngineView with view.show(), then I can close the window that opens and the program will exit. (But I don't want to have any GUI, so this isn't good)

Next, I tried to show the view, then immediately close it after with view.close(), but when I do this a PDF doesn't get generated. I tried adding a 5 second sleep after view.show() and before view.close(), but still the same result.

I'm not sure if what I want is possible, I understand Qt is for GUIs but it would be very convenient if I could get this working completely through the command line.

import sys
import os
from time import sleep

from PyQt5.QtWidgets import QApplication
from PyQt5.QtWebEngineWidgets import QWebEngineView
from PyQt5.QtCore import QDir, QUrl

# needed to load local html files
sys.argv.append("--disable-web-security")
app = QApplication(sys.argv)

raw_html = ""
with open('webpage.htm', 'r') as myfile:
    raw_html = myfile.read()

view = QWebEngineView()
view.setHtml(raw_html)

def save_pdf(finished):
    view.page().printToPdf("output.pdf")
    # view.show()
    # view.close()

view.loadFinished.connect(save_pdf)

sys.exit(app.exec_())

Answer 1

Try it:

import sys
from PyQt5 import QtCore, QtWidgets, QtWebEngineWidgets

app = QtWidgets.QApplication(sys.argv)

loader = QtWebEngineWidgets.QWebEngineView()
loader.setZoomFactor(1)

loader.page().pdfPrintingFinished.connect(loader.close)             # <---

loader.load(QtCore.QUrl('https://en.wikipedia.org/wiki/Main_Page'))

def emit_pdf(finished):
    #loader.show()
    loader.page().printToPdf("test.pdf")

loader.loadFinished.connect(emit_pdf)

app.exec()