[Qt-qml] Plugin example [was: Re: A simple, complete example of QML onvoking C++?]

[Alain FLORET]

Hi,

This example is useful for me too, but i've a question about the plugins 
example of qt examples, if i compile it and try to execute "qml 
plugins.qml" nothing appears in qmlviewer, something is wrong in the 
qmldir or miss something ?

Another question is if i create a plugin in a tree  like 
"plugins/graphic/base" how can i access it from a QApplication, i must 
use QDeclarativeEngine or QDeclarativeView and set Engine ImportPath() ?
Is someone have an example of that ?

Thanks.

FLORET Alain
Developer
CORYS TESS
E-mail : afloret at corys.fr
--


Le 15/04/2010 07:22, matthias.ettrich at nokia.com a écrit :
> Hi Peter,
>
> I'm uncertain whether it now works for you or not. If it doesn't, please ensure the qml viewer has been built with the very same Qt as you build the plugin, and if this still fails, please post the output you get when debugging with QML_IMPORT_TRACE=1.
>
> I did build and run the example on both Linux and Windows, so technically it is correct.
>
> Matthias
> ________________________________________
> From: ext Peter Matuchniak [pmatuchniak at imsco-us.com]
> Sent: Wednesday, April 14, 2010 6:35 PM
> To: Ettrich Matthias (Nokia-D-Qt/Berlin); qt-qml at trolltech.com
> Subject: RE: [Qt-qml] Plugin example [was: Re:  A simple,complete example of QML         onvoking C++?]
>
> Hello Matthias
>
> Thanks for sharing your example -- this is exactly the kind of sample needed :-)
>
> A few points:
>
> - in the QML file, don't we need to add a line to refer to the shared object, i.e. something like this: "import NativeBackend"
>
> - I get this runtime error (presumably because of the missing import?)
>    file:///.../button/Button.qml:6:5: Type NativeBackend unavailable
>    NativeBackend { id: nativeBackend; }
>
> - during my initial build attempt, there seemed to be an endless loop of messages saying:
>    "button.pro has a future date"
>    This is probably because you are in a later timezone than me?
>    Anyway, I got around this by re-saving each of the files with my local time and all was well after that
>
> Kind regards
> Peter
>
>
>
> -----Original Message-----
> From: qt-qml-bounces at trolltech.com [mailto:qt-qml-bounces at trolltech.com] On Behalf Of Matthias Ettrich
> Sent: Wednesday, April 14, 2010 7:08 AM
> To: qt-qml at trolltech.com
> Subject: [Qt-qml] Plugin example [was: Re: A simple,complete example of QML onvoking C++?]
>
> Hi,
>
> attached is a small example button.zip which demonstrates how to create a C++ plugin which can be used fom qml. The plugin implements a native type called NativeBackend which implements a C++ function called nativeFunction().
>
> An instance of NativeBackend is instantiated declaratively in Button.qml.
>
> Unzip, cd to button, call qmake, make and run it with qml Button.qml. Clicking on the text label will change the text to the return value of the native function.
>
> The file qmldir has to live in the same directory as Button.qml. The engine parses it automatically when loading Button.qml. The files contains the single line "plugin nativebackend lib" which makes the engine expect a plugin binary in the lib subdirectory.
>
> If you run qml with QML_IMPORT_TRACE=1 you will also get debug output from the import loading mechanism:
>
> ~/tmp/button$ QML_IMPORT_TRACE=1 qml Button.qml QDeclarativeEngine::addImportPath "/home/ettrich/dev/qt-qml/bin"
> QDeclarativeEngine::addToImport 0xeffa70 "." -1.-1 File as ""
> QDeclarativeEngine::add: loaded "/home/ettrich/tmp/button/qmldir"
> QDeclarativeEngine::importPlugin ".home.ettrich.tmp.button" from "/home/ettrich/tmp/button/lib/libnativebackend.so"
> QDeclarativeEngine::addToImport 0xeffa70 "Qt" 4.6 Library as ""
> QDeclarativeEngine::resolveType "Rectangle" = "QDeclarativeRectangle"
> QDeclarativeEngine::resolveType "NativeBackend" = "NativeBackend"
> QDeclarativeEngine::resolveType "Text" = "QDeclarativeText"
> QDeclarativeEngine::resolveType "MouseArea" = "QDeclarativeMouseArea"
> Wall startup time: 7
>
>
> Matthias
>
>
>
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