> > I'm trying to read an 8-channel temperature sensor device that outputs its > > data via a web interface. Viewing the device's web page via a normal web > > browser, or via QWebView::load(), I can see the temperatures correctly. The > > temperature values are "live" in that they automatically update about once a > > second, without the user having to manually reload/refresh the browser. My > > HTML skills are pretty minimal, so I'm not sure what magic it uses to update > > those parameters, but I don't see any sort of <meta http- equiv="refresh" > > content="1"> tag. > > That might be some AJAX-y magic I guess? :) There might be some JS > code that is sending some request and updating only a particular DOM > element?
That certainly seems to be the behavior, and that's where it gets beyond my level of web knowledge, might be time to start learning that - it seems this whole web fad might be here to stay! > Is it possible for you to alter the web pages code? If so, you could > probably use the webkit-bridge concept where the page (via some > modified JS code) calls a Qt slot on each refresh. I can't alter the web page's code, it's coming from a vendor's device that has an embedded webserver installed. So closed architecture, closed source, etc... > Or if thats not possible, how about inspecting the DOM and finding out > the value of the required element? I guess you're already doing that > on page load, but you probably don't have to refresh the page from > outside as the page is doing that itself. If you can find the refresh > time that the page is using, you could use the same refresh freq for > parsing the DOM tree once a page load completes. Would that work? That's sort of what I'm doing now. My initial code had a slot that would parse the HTML for the values I'm looking for. I connected that slot to the QWebView's loadFinished() signal, which worked ONCE; on the initial connection to the web server only. So what I've now done is created a QTimer running every 100ms that keeps calling loadFinished(), which keeps reparsing the HTML, and this works. So the raw HTML is changing - I'm just surprised that Qt doesn't seem to have any signals that get triggered off from this... Sean _______________________________________________ Interest mailing list Interest@qt-project.org http://lists.qt-project.org/mailman/listinfo/interest
