PyQt的圖像捕捉錯誤

Question

我試圖去設置鏈接，並使用PyQt的拍攝有快照，代碼工作正常的一個網址：

#!/usr/bin/env python 
import sys, itertools 
import signal 
from PyQt4.QtCore import * 
from PyQt4.QtGui import * 
from PyQt4.QtWebKit import QWebPage 

urls = "http://www.gouvernement.fr/", "http://www.google.com/" 
outputs = "output1.png", "output2.png" 
#for url in urls: #and output in ouputs: 
for url, output in itertools.izip(urls, outputs): 

    def onLoadFinished(result): 
    if not result: 
     print "Request failed" 
     sys.exit(1) 

    # Set the size of the (virtual) browser window 
    webpage.setViewportSize(webpage.mainFrame().contentsSize()) 

    # Paint this frame into an image 
    image = QImage(webpage.viewportSize(), QImage.Format_ARGB32) 
    painter = QPainter(image) 
    webpage.mainFrame().render(painter) 
    painter.end() 
    image.save(output) 
    print ".png image successfully saved" 
    #sys.exit(0) 


    app = QApplication(sys.argv) 
    signal.signal(signal.SIGINT, signal.SIG_DFL) 

    webpage = QWebPage() 
    webpage.connect(webpage, SIGNAL("loadFinished(bool)"), onLoadFinished) 
    webpage.mainFrame().load(QUrl(url)) 
    sys.exit(app.exec_()) 

但是，因爲它去throuhg一個快照，它只是掛起和犯規繼續下一個快照。這是爲什麼 ？

Answer 1

您粘貼的代碼的縮進並不能說明您的for循環的走向有多遠 - 我認爲每次都會在循環內結束？

如果是這樣，那麼它的清楚爲什麼你的代碼不起作用：你叫app.exec_，這將阻止，直到最後一個窗口被關閉或您撥打quit或exit。就像你永遠不會做的那樣，它會永遠阻止

如果你想以這種方式處理多個URL，你應該使用你的事件處理程序來保存頁面並加載下一個URL。像這樣的東西應該工作：

#!/usr/bin/env python 
import sys, itertools 
import signal 
from PyQt4.QtCore import * 
from PyQt4.QtGui import * 
from PyQt4.QtWebKit import QWebPage 

urls = ["http://www.gouvernement.fr/", "http://www.google.com/"] 
outputs = ["output1.png", "output2.png"] 

def save_page(webpage, output): 
    # Set the size of the (virtual) browser window 
    webpage.setViewportSize(webpage.mainFrame().contentsSize()) 

    # Paint this frame into an image 
    image = QImage(webpage.viewportSize(), QImage.Format_ARGB32) 
    painter = QPainter(image) 
    webpage.mainFrame().render(painter) 
    painter.end() 
    image.save(output) 
    print ".png image successfully saved" 
    #sys.exit(0) 


app = QApplication(sys.argv) 
signal.signal(signal.SIGINT, signal.SIG_DFL) 

webpage = QWebPage() 

def onLoadFinished(result): 
    if not result: 
     print "Request failed" 
     sys.exit(1) 
    save_page(webpage, outputs.pop(0)) # pop output name from list and save 
    if urls: 
     url = urls.pop(0) # pop next url to fetch from list 
     webpage.mainFrame().load(QUrl(url)) 
    else: 
     app.quit() # exit after last url 

webpage.connect(webpage, SIGNAL("loadFinished(bool)"), onLoadFinished) 
webpage.mainFrame().load(QUrl(urls.pop(0))) 
sys.exit(app.exec_())