As dynamic libraries to use class variables?



  • And if I do, the function does not work.

    void StrategyCod(double Parametr, MainWindow *w)
    {
        qDebug()<<"Library work2"<< Parametr<<w->NBar;
        w->NBar=2000;
    }
    

    error:
    Invalid parameter passed to C runtime function.
    Invalid parameter passed to C runtime function.


  • Lifetime Qt Champion

    Well if Perebor2 still runs when you do MyLib.unload()
    its not so nice for it...



  • How to wait for all Perebor2?
    How to change w->NBar throw StrategyCod? If I do it in one thred

    void StrategyCod(double Parametr, MainWindow *w)
    {
        qDebug()<<"Library work2"<< Parametr<<w->NBar;
        w->NBar=2000;
    }
    

    it compiles, but when it works errors appears:
    ASSERT failure in QVector<T>::operator[]: "index out of range", file ....\Qt5.9.2\5.9.2\mingw53_32\include/QtCore/qvector.h, line 430
    Invalid parameter passed to C runtime function.
    Invalid parameter passed to C runtime function.


  • Lifetime Qt Champion

    @Mikee
    Dont wait for it.
    Just move the MyLib.unload(); to a better place.

    also if you have

    void mainwindow::somefunction {
    QVector <double> Perebor1;
    for (double i=d1;i<=d2;i=i+d3)
    {
    Perebor1.append(i);
    }
    QLibrary MyLib("C:\Qt\project\build-StrategyCod-Desktop_Qt_5_9_2_MinGW_32bit-Debug\debug\StrategyCod");
    MyLib.load();
    typedef void (*MyPrototype)(double,MainWindow *);
    MyPrototype StrategyCod = (MyPrototype) MyLib.resolve("StrategyCod");
    //StrategyCod(ParametrForStrategyCod,this);
    QFuture<void> Perebor2 = QtConcurrent::map(Perebor1,[&](const double& d){ StrategyCod(d,this);});
    MyLib.unload();
    } // Perebor1 is deleted here.

    Perebor1 also dies as its a local
    so make them member variables of the class
    and structure code better.



  • `Perebor in class ,MainWindow. It doesn't work. Errors are the same.
    ``
    for (double i=d1;i<=d2;i=i+d3)
    {
    Perebor.append(i);
    }

       QLibrary MyLib("C:\\Qt\\project\\build-StrategyCod-Desktop_Qt_5_9_2_MinGW_32bit-Debug\\debug\\StrategyCod");  
       MyLib.load();
       typedef void (*MyPrototype)(double,MainWindow *);
       MyPrototype StrategyCod = (MyPrototype) MyLib.resolve("StrategyCod");
       //StrategyCod(ParametrForStrategyCod,this);  
       //QFuture<void> Perebor2 = QtConcurrent::map(Perebor1,[&](const double& d){ StrategyCod(d,this);});  
       QFuture<void> Perebor2 = QtConcurrent::map(Perebor,[&](const double& d){ StrategyCod(d,this);});
    

  • Lifetime Qt Champion

    What about Perebor2 ?
    Wont it suffer the same and run out of scope ?



  • No. It's okey with Perebor2. Function StrategyCod2 is in class MainWindow works correctly.

    for (double i=d1;i<=d2;i=i+d3) 
           {
               Perebor.append(i);
           }
    
           QFuture<void> Perebor2 = QtConcurrent::map(Perebor,[this](const double& d){ StrategyCod2(d);});
    

  • Lifetime Qt Champion

    @Mikee
    Ok for
    QLibrary MyLib;
    docs says
    QLibrary::~QLibrary()

    Destroys the QLibrary object.
    Unless unload() was called explicitly, the library stays in memory until the application terminates.

    so that seems ok.

    Im not sure what line gives the
    "Invalid parameter passed to C runtime function."

    You should use the debugger to find out.


  • Lifetime Qt Champion

    Out of curiosity, why are you dynamically loading that library since it's so tied to your application and that you are in control of both ?



  • Because I need to change the function code.
    There is problem in this string:

    QFuture<void> Perebor2 = QtConcurrent::map(Perebor,[&](const double& d){ StrategyCod(d,this);});
    

    because it's working:

    QLibrary MyLib("C:\\Qt\\project\\build-StrategyCod-Desktop_Qt_5_9_2_MinGW_32bit-Debug\\debug\\StrategyCod");  
        MyLib.load();
        typedef void (*MyPrototype)(double,MainWindow *);
        MyPrototype StrategyCod = (MyPrototype) MyLib.resolve("StrategyCod");
        StrategyCod(ParametrForStrategyCod,this);  
        MyLib.unload();
    

    and it's working:

    for (double i=d1;i<=d2;i=i+d3) 
           {
               Perebor.append(i);
           }
    QFuture<void> Perebor2 = QtConcurrent::map(Perebor,[this](const double& d){ StrategyCod2(d);});
    

    Maybe it needs to insert something there:

    QFuture<void> Perebor2 = QtConcurrent::map(Perebor,[&](const double& d)(/*insert something there*/){ StrategyCod(d,this);});
    

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