General and Desktop

hi. i have found out the answer. it is not possible to port qt 4.7.4 applications to E63. only qt 4.6 applications can be ported. here is the link that outlines the details. check this out: "http://stackoverflow.com/questions/8728747/developing-application-for-different-symbian-devices".

You need to use Qt layout functionality if you want Qt to do anything to layout/resize the content of your widgets.

tnx a lot for your help.

Or just use 2 QGraphicsRectItems with a common parent.

Check to see if QSystemDeviceInfo has a backend implemented for you particular platform. If it has then you're all set. If not then you will need to implement a backend or convince someone to do it for you.

I think that is the problem. Too bad. Thanks anyway.

"QNetworkReply::header(QNetworkRequest::ContentLengthHeader) ":/doc/qt-4.8/qnetworkreply.html#header is what ZapB suggested. Be aware that not on every request a content length header is sent!

I suppose that would be fine. I am looking into making an onscreen keyboard, I am not sure if Qt is the logical framework to use. Thanks for your input.

modify @Serial sSerial; sSerial.Serial_Thread_Start(cThread); sSerial.moveToThread(&cThread);@ to: @Serial* sSerial=new Serial(this); sSerial->Serial_Thread_Start(cThread); sSerial->moveToThread(&cThread);@

Thank you very much alexisdm, actually I already tried moveToThread, but it doesn't work in my case, I don't know why. I also checked that tobj didn't have parent, but still, no result. I ended up initializing static stuff outside the class itself, it's ugly but it works. I will try your suggestion soon and let you know the results :) Thanks again

It is fixed in Qt5 already (see https://codereview.qt-project.org/#change,22653). I've not had time to backport to 4.8.x yet. Still lots of work that could be done to improve using Core profile GL with Qt though.

Solved ! The database used to save the data has been build using SQL Maestro. In that case, the data inserted in the table is not returned when a Select is done on the table. If I used SQLite Expert to create the database, everything works fine, that is, the data can be selected and is accessed through the query in my Qt Application. Concluison : The tool used to create the database is the cause of the problem ! This means that you must take care of what tool you use to create the database. Moreover, I found that if I create (using my Qt application) a table X in a database Z created with SQL Maestro, than the data for that table X is returned as expected. But the other tables within that database Z are not !!!!!!!!!

Hi Rutger, Can't tell exactly whats going wrong in you'r code but I've been having similar problem long time ago with random crashes in some moment of development. In my case it turned out that I had some wrong memory/parentship management of widgets and some problems pointers stored in QList. Effect was that my project worked in debug mode (with same errors as you have), and crashed in release mode. When I've cleaned up my code and set up memory management properly everything started to work well without any debug errors and crashes.

There is also some description in the "forum help":http://qt-project.org/wiki/ForumHelp#e3f82045ad0f480d3fb9e0ac2d58fb01

Thank you for your answer! I think i found a solution. Back to reality: I've created a class PushButton - successor of QPushButton. Implementation of this widget was made in plugin for Qt Designer. In Qt Designer i've selected QDockWidget like a container-form. PushButton was placed on the form. Form was saved in "widget.ui" file. In main application dock widget is loading by @QWidget *myWidget = loader.load(&file, 0);@ with a qobject_cast 'ing. Then i've tried to find my custom widget like a child of QDockWidget: @ myWidget->findChild<PushButton*>();@ but this method returned a NULL-pointer. Nevertheless, i can get target pointer by: @QPushButton ancestor = myWidget->findChild<QPushButton>();@ Object's casting from QPushButton to PushButton returned NULL also. My solution is: @if(ancestor->inherits("PushButton")) PushButton btn = reinterpret_cast<PushButton>(ancestor); @

thanks, including the macro Q_OBJECT I solved the problem.

by Jove Olde Beane...think you got it it works! thanks! I had tried repaint() but put it in the wrong place

Great, thank you.

now you can use Qt3D as a part for Qt4.8.1 or Qt5 http://labs.qt.nokia.com/2012/04/11/qt-3d-and-qt5-qt4-news-and-releases/