now the problem is different: I have a button, when clicked, I start the thumbnail+scale thread. nothing happen but I do capture the page load start signal; can not capture the finish loading signal; then I click the button again, got this error:
QObject::startTimer: timers cannot be started from another thread I do not see this when first click the button. thanks, canal ________________________________ From: René Jahn <[email protected]> To: [email protected] Sent: Fri, August 20, 2010 7:41:16 PM Subject: Re: [Qt-jambi-interest] Error: QObject used from outside its own thread Are you behind a proxy? Von:[email protected] [mailto:[email protected]] Im Auftrag von go canal Gesendet: Freitag, 20. August 2010 12:52 An: Helge Fredriksen Cc: [email protected] Betreff: Re: [Qt-jambi-interest] Error: QObject used from outside its own thread Hi, you are right, I do not need a thread to load a page; what I wanted to do is to capture the web page, scale it, and save as an image file. this may takes some time and I wanted to put it into a separate thread. I modified a little bit (put new QWebPage() into run() method), the exception is gone; however, I am not able to capture the loadFinished signal (but can capture start loading signal): public class Thumbnailer extends QObject implements Runnable { QWebPage page; String url; public Thumbnailer (String url) { this.url = url; } public void run() { page = new QWebPage(); /* <<<< exception if I put this is in the constructor */ page.loadFinished.connect (this, "render(Boolean)"); page.mainFrame().load(new QUrl(url)); } private void renbder (Boolean b) { ..... } } thanks, canal ________________________________ From:Helge Fredriksen <[email protected]> To: go canal <[email protected]> Cc: [email protected] Sent: Fri, August 20, 2010 3:17:05 PM Subject: Re: [Qt-jambi-interest] Error: QObject used from outside its own thread Hello! Have you studied the "Hello Webkit" example in our demo application? It seems that no extra thread is necessary to load a page, everything happens in the QWebView.load() method, and it seems to take place without freezing the UI. Best regards, Helge Fredriksen On 08/20/2010 03:40 AM, go canal wrote: > Hi Rene, > Thanks for your sharing. I can access the web, but I have problems > putting it into a different thread. > > What I wanted to do is, upon clicking a button, the slot will create a > new thread: > ---- > Thumbnail nail = new Thumbnail (url); > QThread thread = new QThread (nailer); > thread.start(); > ---- > I though this is how I should create a new Thread in Qt. > > The Thumbnail class is defined as: > > public class Thumbnailer extends QObject implements Runnable { > @Override > public void run() { > page.loadFinished.connect(this, "render(Boolean)"); > > page.mainFrame().load(new QUrl(url)); > } > ...... > } > > But apparently it does not work, exception at > page.mainFrame().load(new QUrl(url)); > > I can not figure out what's wrong.... > > thanks, > canal > > > ------------------------------------------------------------------------ > *From:* René Jahn <[email protected]> > *To:* [email protected] > *Sent:* Thu, August 19, 2010 3:49:11 PM > *Subject:* Re: [Qt-jambi-interest] Error: QObject used from outside > its own thread > > It should work with following code: > > /** > > * The <code>Main</code> class handles the web access. > > * > > * @author René Jahn > > */ > > private static final class Main extends QObject > > { > > > //~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ > > // Class members > > > //~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ > > /** data loaded event. */ > > private final > QSignalEmitter.Signal1<String> loaded = new > QSignalEmitter.Signal1<String>(); > > /** reload event. */ > > private final QSignalEmitter.Signal0 > reload = new QSignalEmitter.Signal0(); > > /** web view. */ > > QWebView web; > > > //~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ > > // Initialization > > > //~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ > > /** > > * Creates a new instance of > <code>Main</code> and starts reading the > > * web page. > > */ > > Main() > > { > > if > (System.getProperty("http.proxyHost") != null) > > { > > try > > { > > > QNetworkProxy proxy = new QNetworkProxy(ProxyType.HttpProxy); > > > proxy.setHostName(System.getProperty("http.proxyHost")); > > > proxy.setPort(Integer.parseInt(System.getProperty("http.proxyPort"))); > > > QNetworkProxy.setApplicationProxy(proxy); > > } > > catch > (Exception e) > > { > > > e.printStackTrace(); > > } > > } > > web = new QWebView(); > > > web.loadFinished.connect(this, "loadFinished(Boolean)"); > > reload.connect(this, > "reloadIntern()"); > > } > > > //~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ > > // User-defined methods > > > //~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ > > /** > > * Triggers the web page reload. > > */ > > public void reload() > > { > > //needed to avoid > threading problems! > > reload.emit(); > > } > > /** > > * Reloades the web page. > > */ > > @SuppressWarnings("unused") > > private void reloadIntern() > > { > > web.load(new > QUrl("http://qtjambi.sourceforge.net";)); > > } > > /** > > * Forwards the html content to the > signal handler. > > * > > * @param pLoaded the loaded state > > */ > > @SuppressWarnings("unused") > > private void loadFinished(Boolean pLoaded) > > { > > > loaded.emit(web.page().mainFrame().toHtml()); > > } > > } // Main > > Regards, > > René > > *Von:* [email protected] > [mailto:[email protected]] *Im Auftrag von *go canal > *Gesendet:* Donnerstag, 19. August 2010 03:38 > *An:* [email protected] > *Betreff:* [Qt-jambi-interest] Error: QObject used from outside its > own thread > > Hello, > > New to Qt Jambi, sorry if this is already been asked before. > > I got an exception: > > ----------------------------------------------------------- > > Exception in thread "Thread-2" QObject used from outside its own > thread, object=QWebPage(0x17b786e8) , > objectThread=Thread[main,5,main], currentThread=Thread[Thread-2,5,main] > > at > com.trolltech.qt.GeneratorUtilities.threadCheck(GeneratorUtilities.java:59) > > at com.trolltech.qt.webkit.QWebPage.mainFrame(QWebPage.java:619) > > at Thumbnailer.run(Thumbnailer.java:44) > > at java.lang.Thread.run(Thread.java:619) > > at com.trolltech.qt.QThread.run(QThread.java:164) > > ----------------------------------------------------------- > > Could not figure out what's wrong. Here is my code > > In the UI_Main : > > { > > ...... > > button.clicked.connect(this, "thumb()"); > > ...... > > } > > void thumb() { > > Thumbnailer nailer = new Thumbnailer (lineEdit.text()); > > QThread thread = new QThread (nailer); > > nailer.moveToThread(thread); > > thread.start(); > > } > > Here is the Thumbnail class (download a web page and create a > thumbnail image): > > public class Thumbnailer extends QObject implements Runnable { > > ...... > > @Override > > public void run() { > > page.loadFinished.connect(this, "render(Boolean)"); > > page.mainFrame().load(new QUrl(url)); > > } > > ...... > > } > > What did I do wrongly ? > > many thanks, > canal > > > > _______________________________________________ > Qt-jambi-interest mailing list > [email protected] > http://lists.trolltech.com/mailman/listinfo/qt-jambi-interest >
_______________________________________________ Qt-jambi-interest mailing list [email protected] http://lists.trolltech.com/mailman/listinfo/qt-jambi-interest
