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  • Fact or fiction: Webkit’s rendering performance is much lower when used in Qt

    - by Jen
    Using Qt’s Webkit implementation renders much slower than directly implementing the Webkit engine -- is this true or just a myth? From my own experience, I found the load time of a complex page about twice as long in Qt’s “Fancy Browser” example as it does in Google Chrome (which also incorporates a port of Webkit), but I hardly think that is a fair comparison. Any insights on this?

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  • Accessing not Non-QObject-based objects from Qt Script

    - by uni
    Is there any nice and simple way to access non QObject-based classes, such as QXmlQuery, QDateTime etc. from Qt Script? The only way I see is to wrap QXmlQuery in another class that inherits QObject and declare as slot every function which I need to access from Qt Script: void MyXmlQuery::setQuery ( const QString & sourceCode, const QUrl & documentURI ) { realxmlquery_.setQuery(sourceCode, documentURI); }

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  • using graphviz with qt

    - by radi
    hi , i have a compiler project and i want to print the ast after the compile complete so can i print this ast to qt (on c++) panel using graphviz ? note : i dont know if there is a binding between qt or c++ and graphviz , so if it doesnt work please help me to find the alternative . thanks .

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  • Serialization with Qt

    - by Narek
    I am programming a GUI with Qt. In my GUI I have a huge std::map. And "MyType" is a class that has different kinds of filds. So, in a word, I want to serialize the std::map. How can I do that? Does Qt provides us with neccesary features? P.S. I would like to use std::map, NOT QMap.

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  • Best C# bindings for Qt?

    - by Stefan Monov
    I've written a game in C# with SDL.NET and OpenGL. I want to add a menu to it, for which I need Qt. What bindings do you recommend for Qt in C#? Qyoto? qt4dotnet? other? Requirements: fast should just work and be polished - i.e. no weird problems at every step integration with the buildsystem, uic, resources, etc, should work well

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  • QT vs. Net - REAL comparisons for R.A.D. projects

    - by Pirate for Profit
    Man in all these Qt vs. .NET discussions 90% these people argue about the dumbest crap. Trying to get a real comparison chart here, because I know a little about both frameworks but I don't know everything. I believe Qt and .NET both have strengths and weaknesses. This is to make a comparison that highlights these so people can make more informed decisions before embarking on a project, in the spirit of R.A.D. Event Handling In Qt the event handling system is very simple. You just emit signals when something cool happens and then catch them in slots. ie. // run some calculations, then emit valueChanged(30, false, 20.2); and then catching it, any object can make a slot to recieve that message easily void MyObj::valueChanged(int percent, bool ok, float timeRemaining). It's easy to "block" an event or "disconnect" when needed, and works seamlessly across threads... once you get the hang of it, it just seems a lot more natural and intuitive than the way the .NET event handling is set up (you know, void valueChanged(object sender, CustomEventArgs e). And I'm not just talking about syntax, because in the end the .NET anonymous delegates are the bomb. I'm also talking about in more than just reflection (because, yes, .NET obviously has much stronger reflection capabilities). I'm talking about in the way the system feels to a human being. Qt wins hands down for the simplest yet still flexible event handling system ever i m o. Plugins and such I do love some of the ease of C# compared to C++, as well as .NET's assembly architecture, even though it leads to a bunch of .dll's (there's ways to combine everything into a single exe though). That is a big bonus for modular projects, which are a PITA to import stuff in C++ as far as RAD is concerned. Database Ease of Doing Crap Also what about datasets and database manipulations. I think .net wins here but I'm not sure. Threading/Conccurency How do you guys think of the threading? In .NET, all I've ever done is make like a list of master worker threads with locks. I like QConcurrentFramework, you don't worry about locks or anything, and with the ease of the signal slot system across threads it's nice to get notified about the progress of things. QConcurrent is the simplest threading mechanism I've ever played with. Memory Usage Also what do you think of the overall memory usage comparison. Is the .NET garbage collector pretty on the ball and quick compared to the instantaneous nature of native memory management? Or does it just let programs leak up a storm and lag the computer then clean it up when it's about to really lag? Doesn't the just-in-time compiler make native code that is pretty good, like and that only happens the first time the program is run? However, I am a n00b who doesn't know what I'm talking about, please school me on the subject.

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  • How strict to be when using Qt framework?

    - by toffeehoops
    I'm building a Qt application that needs to use libssh, a SSH client library. libssh (understandably) performs its own network connections, however Qt has its own infrastructure for network connections (QTcpSocket etc). Should I worry about these differences? Should I be trying to make libssh make network connections via QTcpSocket... Or if it works fine on the platforms I'm targeting, is that good enough?

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  • Making a window a desktop in XLib/Qt

    - by TomMan
    I am trying to write a simple program to act as my desktop background in Qt, I have made it all work fine apart from making it a Desktop Widget. I have no idea on how to do this, I don't mind using XLib or Qt for doing this, but if anyone has some suggestions I would be very happy.

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  • Qt QListView - context menus?

    - by QLatvia
    I'm trying to add a context (right click) menu to a Qt QListView. I see in Qt 3.3 there is "contextMenuRequested" (which I could use) - http://doc.trolltech.com/3.3/qlistview.html#contextMenuRequested. However, I can't see such a method in Qt4. Does anyone know how to add a context menu to a QListView?

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  • Compatibility between Qt and Boost sockets libraries

    - by cake
    Hello In my work, I'm developing a Viewer client for a Offshore simulation server, using sockets to send the simulation data from the Simulator to de Viewer. But, the server uses Boost.asio as it's sockets library. As the client uses Qt for it's GUI, I was wondering if there is any problem in using de Qt Networking library for handling the sockets. Is there any compatibility issues? Thanks in advance, and sorry for my bad english.

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  • Useful Qt Plugins

    - by Cenoc
    I'm a tad new to qt and so far I really only added qwt; but I was wondering, what are some other useful qt plugins? And is there a list somewhere? Thanks in advance.

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  • Porting QT application from Linux to Windows?

    - by umanga
    Greetings all, We are developing a QT application (QT 4.6 LGPL version) in Linux platform.All the libraries we use are cross-platform. Now we want to port it into Windows and continue develop in Windows. My questions are: Which compiler should we use ,Can we use MinGW or Visual C++ compiler? 2.If its Visual C++ compiler, which Visual Studio version should be used ,can we use 'Visual C++ Studio 2010 express' ? thanks in advance.

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  • Qt Audio Recording Question

    - by Cenoc
    This is sort of a follow-up/branch off a previous question, which still stands unresolved. Are there other codecs besides pcm for qt QAudio class? I cant seem to find any... I want to have a way of playing stuff recorded by qt on vlc. Thanks in advance.

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  • Qt: Is it possible to use mixins technique?

    - by Eye of Hell
    Hello. Qt library includes advanced meta-programming capabilities using they own preprocessing moc compiler. Does anyone knows, is it possible to create some kind of mix-ins via it? For example, i have a QString and want to add a method to it without sub-classing and changing existing code. Does Qt have such solutions for that?

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  • MultiOS "Jet Database" for C++/Qt?

    - by Airjoe
    Hopefully I can articulate this well: I'm porting an application I made years ago from VB6 (I know, I know!) to C++/Qt. In my original application, one thing I liked was that I didn't need an actual SQL server running, I could just use MS Access .mdb files. I was wondering if something similar exists for Qt that will work on multiple OSes - a database stored in a file, pretty much, but that I can still run SQL queries with. Not sure if something like this exists or not, but any help appreciated, thanks!

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  • zipping a folder/file using qt

    - by sneha
    Hello every one,i would like to know if we have any class in qt which can zip a folder or file.i used qprocess to compress,it got compressed but i am unable to uncompress it using normal zip tool.can anyone let me know how can we compress a folder/file using qt api classes

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  • Qt C++ XML, validating against a DTD?

    - by Airjoe
    Is there a way to validate an XML file against a DTD with Qt's XML handling? I've tried googling around but can't seem to get a straight answer. If Qt doesn't include support for validating an XML file, what might be the process of implementing validation myself? Any good reference to start with in regards to validating XML against a spec? Thanks for the help!

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  • Expose C++ object to Javascript in Qt

    - by Evans
    Is there any way I can expose a C++ object/function to JavaScript running inside the QtWebKit browser in Qt? It's possible to expose ActionScript objects to JS code running inside the WebKit browser in Adobe AIR - I'm looking for similar functionality in Qt.

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  • QT sqlite deploy exe

    - by Samir
    I have a Qt exe built from visual studio 2005(after taking the .cpp, .h, .moc, ui_ files) I have done some simple QSqlite queries. It works fine in my development pc. But in another pc it crashes for the line below: QSqlDatabase mSqlDb How to run the exe so that it can interact with sqlite from another pc. [Any other gui application runs just fine.] So which things are necessary to deploy a sqlite-qt application ?

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