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Because your "handler" object gets destroyed when sliderC class constructor
finishes its work (before the application enters the event loop)?
On Wednesday 30 June 2010 22:54:28 Alexander Carôt wrote:
> Hello all,
>
> I have basic understanding problem regarding QScript: In a simple example I
> am dragging a QSlider, which in turn calls a QScript that plots the
> respective fader position into the terminal.
>
> The script looks like this:
>
> (function give( value ){
> print('Slider has value and returns:', value );
> return value;
> })
>
> and the respective main function looks like this:
>
> ************
> int main( int argc, char* argv[] ){
> QApplication app( argc, argv );
> QWidget *GUI = new QWidget();
> QSlider *slider = new QSlider();
> QScriptEngine engine;
> QString fileName = "translator.qs";
> QFile scriptFile(fileName);
> scriptFile.open(QIODevice::ReadOnly);
> QTextStream stream(&scriptFile);
> QString contents = stream.readAll();
> scriptFile.close();
> QScriptValue handler = engine.evaluate(contents,fileName);
> qScriptConnect( slider, SIGNAL( valueChanged(int) ), QScriptValue(),
> handler);
> }
> ***********
>
> This works fine, however, when replacing the code from the main function into
> a separated class the script is not called anymore:
>
>
> **********
> #include "sliderC.h"
> int main( int argc, char* argv[] ){
> QApplication app( argc, argv );
>
> sliderC myScriptExample;
>
> return app.exec();
> }
>
> #include "sliderC.h"
> sliderC::sliderC(){
> QWidget *GUI = new QWidget();
> QSlider *slider = new QSlider();
> QScriptEngine engine;
> QString fileName = "translator.qs";
> QFile scriptFile(fileName);
> scriptFile.open(QIODevice::ReadOnly);
> QTextStream stream(&scriptFile);
> QString contents = stream.readAll();
> scriptFile.close();
> QScriptValue handler = engine.evaluate(contents,fileName);
> qScriptConnect( slider, SIGNAL( valueChanged(int) ), QScriptValue(),
> handler);
> }
> ***********
>
> Can anyone explain me why this is the case ?
>
> Thanks a lot in advance
>
> -- A l e x
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