help with QAbstractNativeEventFilter

[alee]

hi,

i am trying to catch native events on the windows platform, to communicate with an hid usb device.... i have successfully done so using the nativeEvent method in QWidget....now i am trying to create a generic class that can be added to any QWidget or QMainWindow.

for this pupose i am trying to derive a class from QAbstractNativeEventFilter .... Override the virtual nativeEventFilter and instantiate this class in the QWidget of my choice....yet i am unable to recieve any events so far.....

i am new to qt and havent had much experience using abstract classes.....i am attaching a sample below....using this example the code compiles and the widget window appears but the nativeeventfilter method is not called. any help would be highly appreciated.....

usbworker.h

#ifndef USBWORKER_H
#define USBWORKER_H
 
#include <QAbstractNativeEventFilter>
 
class usbworker : public QAbstractNativeEventFilter
{
public:
    usbworker();
    virtual bool nativeEventFilter(const QByteArray &eventType, void *message, long *result);
 
};
 
#endif // USBWORKER_H

#ifndef USBWORKER_H
#define USBWORKER_H

#include <QAbstractNativeEventFilter>

class usbworker : public QAbstractNativeEventFilter
{
public:
    usbworker();
    virtual bool nativeEventFilter(const QByteArray &eventType, void *message, long *result);

};

#endif // USBWORKER_H

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usbworker.cpp

#include "usbworker.h"
 
usbworker::usbworker()
{
 
}
 
 
bool usbworker::nativeEventFilter(const QByteArray &eventType, void *message, long *result)
Q_DECL_OVERRIDE
{
    qDebug("i came here");
    return false;
}

#include "usbworker.h"

usbworker::usbworker()
{

}


bool usbworker::nativeEventFilter(const QByteArray &eventType, void *message, long *result)
Q_DECL_OVERRIDE
{
    qDebug("i came here");
    return false;
}

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widget.h

#ifndef WIDGET_H
#define WIDGET_H
 
#include <QWidget>
#include <usbworker.h>
 
namespace Ui {
class Widget;
}
 
class Widget : public QWidget
{
    Q_OBJECT
 
public:
    explicit Widget(QWidget *parent = 0);
    ~Widget();
    usbworker uw;
 
private:
    Ui::Widget *ui;
};
 
#endif // WIDGET_H

#ifndef WIDGET_H
#define WIDGET_H

#include <QWidget>
#include <usbworker.h>

namespace Ui {
class Widget;
}

class Widget : public QWidget
{
    Q_OBJECT
    
public:
    explicit Widget(QWidget *parent = 0);
    ~Widget();
    usbworker uw;
    
private:
    Ui::Widget *ui;
};

#endif // WIDGET_H

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widget.cpp

#include "widget.h"
#include "ui_widget.h"
 
 
Widget::Widget(QWidget *parent) :
    QWidget(parent),
    ui(new Ui::Widget)
{
    ui->setupUi(this);
}
 
Widget::~Widget()
{
    delete ui;
}

#include "widget.h"
#include "ui_widget.h"


Widget::Widget(QWidget *parent) :
    QWidget(parent),
    ui(new Ui::Widget)
{
    ui->setupUi(this);
}

Widget::~Widget()
{
    delete ui;
}

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main.cpp

#include "widget.h"
#include <QApplication>
 
int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    Widget w;
    w.show();
 
    return a.exec();
}

#include "widget.h"
#include <QApplication>

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    Widget w;
    w.show();
    
    return a.exec();
}

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i am using qt 5.1.0