calling a simple PyQt application more than once
jjposner at optimum.net
Fri Jan 27 18:42:24 EST 2012
Jabba Laci wrote:
> I have a simple PyQt application that creates a webkit instance to
> scrape AJAX web pages. It works well but I can't call it twice. I
> think the application is not closed correctly, that's why the 2nd call
> fails. Here is the code below. I also put it on pastebin:
> http://pastebin.com/gkgSSJHY .
> The question is: how to call this code several times within a script.
You want to create/execute/quit a QApplication just once, not multiple
I don't know either WebKit or AJAX. In fact, I've never done any
networking with PyQt. But a little playing with the QtNetwork module
yielded this, using the QNetworkAccessManager and QNetworkRequest classes:
from PyQt4.QtCore import QUrl
from PyQt4.QtGui import QApplication, QPushButton
from PyQt4.QtNetwork import QNetworkAccessManager, QNetworkRequest
resp = reply_obj.readAll()
req = QNetworkRequest(QUrl(MYURL))
MYURL = 'http://simile.mit.edu/crowbar/test.html'
if __name__ == "__main__":
# we need only one application object and one net-access mgr
app = QApplication()
mgr = QNetworkAccessManager()
# the entire GUI is one button
btn = QPushButton("Press me")
# start the event loop
You can click the "Press me" button as many times as you wish; it
retrieves and displays/prints the same HTML file on each click.
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