Problem using QtConcurrent with members fuctions

[Hogwarts]

Hello every one!
I'm using QtConcurrent to load a file in other thread:

struct tipoRegistro {
   qint16 val1;
   qint16 val2 ;
   qint16 val3;
};
 
tipoRegistro MainWindow::readFileStepByStep()
{
    file.read(reinterpret_cast<char*> (&reg),sizeof(tipoRegistro));
    return reg;
}
 
void MainWindow::qtConcurrentTest()
{
    QVector<tipoRegistro> vector;
    tipoRegistro treg;
    treg.val1 = -1;
    treg.val2 = -1;
    treg.val3 = -1;
    for(int i = 0; i < num_muestras_canal; i++)
        vector.append(treg);
 
    QProgressDialog dialog;
    dialog.setLabelText(QString("Cargando archivo ECG"));
 
    QFutureWatcher<void> futureWatcher;
    QObject::connect(&futureWatcher, SIGNAL(finished()), &dialog, SLOT(reset()));
    QObject::connect(&dialog, SIGNAL(canceled()), &futureWatcher, SLOT(cancel()));
    QObject::connect(&futureWatcher, SIGNAL(progressRangeChanged(int,int)), &dialog, SLOT(setRange(int,int)));
    QObject::connect(&futureWatcher, SIGNAL(progressValueChanged(int)), &dialog, SLOT(setValue(int)));
 
    futureWatcher.setFuture(QtConcurrent::mapped(vector,readFileStepByStep));
 
    dialog.exec();
 
    futureWatcher.waitForFinished();
}

struct tipoRegistro {
   qint16 val1;
   qint16 val2 ;
   qint16 val3;
};

tipoRegistro MainWindow::readFileStepByStep()
{
    file.read(reinterpret_cast<char*> (&reg),sizeof(tipoRegistro));
    return reg;
}

void MainWindow::qtConcurrentTest()
{
    QVector<tipoRegistro> vector;
    tipoRegistro treg;
    treg.val1 = -1;
    treg.val2 = -1;
    treg.val3 = -1;
    for(int i = 0; i < num_muestras_canal; i++)
        vector.append(treg);

    QProgressDialog dialog;
    dialog.setLabelText(QString("Cargando archivo ECG"));

    QFutureWatcher<void> futureWatcher;
    QObject::connect(&futureWatcher, SIGNAL(finished()), &dialog, SLOT(reset()));
    QObject::connect(&dialog, SIGNAL(canceled()), &futureWatcher, SLOT(cancel()));
    QObject::connect(&futureWatcher, SIGNAL(progressRangeChanged(int,int)), &dialog, SLOT(setRange(int,int)));
    QObject::connect(&futureWatcher, SIGNAL(progressValueChanged(int)), &dialog, SLOT(setValue(int)));

    futureWatcher.setFuture(QtConcurrent::mapped(vector,readFileStepByStep));

    dialog.exec();

    futureWatcher.waitForFinished();
}

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I get the fallowing error:

../ECGReader/mainwindow.cpp: In member function 'void MainWindow::qtConcurrentTest()':
../ECGReader/mainwindow.cpp:264:75: error: no matching function for call to 'mapped(QVector<tipoRegistro>&, <unresolved overloaded function type>)'
../ECGReader/mainwindow.cpp:264:75: note: candidates are:
/usr/include/qt4/QtCore/qtconcurrentmap.h:181:74: note: QFuture<typename QtPrivate::MapResultType<void, MapFunctor>::ResultType> QtConcurrent::mapped(const Sequence&, MapFunctor) [with Sequence = QVector<tipoRegistro>, MapFunctor = tipoRegistro (MainWindow::*)(), typename QtPrivate::MapResultType<void, MapFunctor>::ResultType = void]
/usr/include/qt4/QtCore/qtconcurrentmap.h:181:74: note: no known conversion for argument 2 from '<unresolved overloaded function type>' to 'tipoRegistro (MainWindow::*)()'
/usr/include/qt4/QtCore/qtconcurrentmap.h:188:74: note: template<class Iterator, class MapFunctor> QFuture<typename QtPrivate::MapResultType<void, MapFunctor>::ResultType> QtConcurrent::mapped(Iterator, Iterator, MapFunctor)

I think the problem can be using members fuction, but i tried modifying the line tis way:

futureWatcher.setFuture(QtConcurrent::mapped(vecto r, &MainWindow::readFileStepByStep));

but I keep getting errors

If anyone can help...thanks in advanced.
Regards.

pd: Sorry my english