Hi,

I have two arrays of QVector<double>, and I would like a script to calculate two variables mVar and nVar, I can't seem to get it to work.

Here is my C++ codes and the script, can anyone help please? Thanks!

Qt Code: 
  1. #include <QScriptEngine>
  2. #include <QCoreApplication>
  3. #include <QFile>
  4. #include <QDebug>
  5.  
  6. static QScriptValue toQScriptValue( const QVector<double>& val, QScriptEngine& engine )
  7. {
  8.   QScriptValue result = engine.newArray( val.size() );
  9.   for ( int idx = 0; idx < val.size(); idx++ ) {
  10.     result.setProperty( idx, val[ idx ] );
  11.   }
  12.   return result;
  13. }
  14.  
  15. int main( int argc, char** argv )
  16. {
  17.   QCoreApplication app( argc, argv );
  18.  
  19.   // two arrays gr, rhob
  20.   int size = 10;
  21.   QVector<double> gr( size ), rhob( size );
  22.   for ( int idx = 0; idx < size; idx++ ) {
  23.     gr[ idx ] = 200. * qrand() / RAND_MAX;
  24.     rhob[ idx ] = 2.2 + 0.6 * qrand() / RAND_MAX;
  25.   } 
  26.  
  27.   QScriptEngine engine;
  28.   engine.globalObject().setProperty( "gr", toQScriptValue( gr, engine ) );
  29.   engine.globalObject().setProperty( "rhob", toQScriptValue( rhob, engine ) );
  30.  
  31.   // script to calculate mVar, nVar
  32.   QString scriptFileName( "func.js" );
  33.   QFile scriptFile( scriptFileName );
  34.   scriptFile.open( QIODevice::ReadOnly );
  35.   QString contents = scriptFile.readAll();
  36.   scriptFile.close();
  37.  
  38.   // not working
  39.   QScriptValue func = engine.evaluate( contents, scriptFileName );
  40.   qDebug() << func.toString();
  41.   qDebug() << func.property( "mVar" ).toString();
  42.   qDebug() << func.property( "nVar" ).toString();
  43.  
  44.   // not working either
  45.   QScriptValue result = func.call();
  46.   qDebug() << result.toString();
  47.   qDebug() << result.property( "mVar" ).toString();
  48.   qDebug() << result.property( "nVar" ).toString();
  49.  
  50. }
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and following is func.js script
Qt Code: 
  1. var mVar;
  2. var nVar;
  3.  
  4. function calcMN()
  5. {
  6.   mVar = new Array( gr.length );
  7.   nVar = new Array( gr.length );
  8.   for ( var idx = 0; idx < gr.length; idx++ ) {
  9.     mVar[ idx ] = Math.pow( gr[ idx ], 2 ) / Math.pow( rhob[ idx ], 4 );
  10.     nVar[ idx ] = gr[ idx ] / rhob[ idx ];
  11.     print( "m = ", mVar[ idx ], ", n = ", nVar[ idx ] );
  12.   }
  13. }
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