cannot call member function without object

[been_1990]

Yes. Here it is:
main.cpp:

#include <QtGui/QApplication>
#include <QObject>
#include "widget.h"
#include "qapp.h"
 
 
int main(int argc, char *argv[])
{
    //QApp *app = qobject_cast<QApp>(qApp);
    QApp a(argc, argv);
    Widget w;
    w.show();
 
    QObject::connect(&a,SIGNAL(mouseCoord(int, int, int, int, int)),
                     &w,SLOT(mouseCoord(int, int, int, int, int)));
 
    return a.exec();
}

#include <QtGui/QApplication>
#include <QObject>
#include "widget.h"
#include "qapp.h"


int main(int argc, char *argv[])
{
    //QApp *app = qobject_cast<QApp>(qApp);
    QApp a(argc, argv);
    Widget w;
    w.show();

    QObject::connect(&a,SIGNAL(mouseCoord(int, int, int, int, int)),
                     &w,SLOT(mouseCoord(int, int, int, int, int)));

    return a.exec();
}

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qapp.cpp:

extern "C"{
#include "raw_mouse.h"
}
#include "qapp.h"
#include <QDebug>
#include <QAbstractEventDispatcher>
#define WM_INPUT 0x00FF
 
QApp::QApp(int & argc, char ** argv) :
    QApplication(argc,argv)
{
    qDebug() << init_raw_mouse(1, 0, 1);
    qDebug() << raw_mouse_count();
    QAbstractEventDispatcher::instance(0)->setEventFilter(eventFilter);
 
 
 
}
 
 
bool QApp::eventFilter(void *msg)
{
    MSG *mess;
 
    mess = (MSG*)msg;
    //qDebug() << mess->message;
    switch(mess->message){
    case WM_INPUT:
        {
            add_to_raw_mouse_x_and_y((HANDLE)mess->lParam);
            for (int i = 0; i < raw_mouse_count(); i++){
                emit mouseCoord(get_raw_mouse_x_delta(i), get_raw_mouse_y_delta(i),
                                      is_raw_mouse_button_pressed(i, 0), is_raw_mouse_button_pressed(i, 1), is_raw_mouse_button_pressed(i, 2));
            }
 
        }
        return true;
    }
    return false;
}

extern "C"{
#include "raw_mouse.h"
}
#include "qapp.h"
#include <QDebug>
#include <QAbstractEventDispatcher>
#define WM_INPUT 0x00FF

QApp::QApp(int & argc, char ** argv) :
    QApplication(argc,argv)
{
    qDebug() << init_raw_mouse(1, 0, 1);
    qDebug() << raw_mouse_count();
    QAbstractEventDispatcher::instance(0)->setEventFilter(eventFilter);



}


bool QApp::eventFilter(void *msg)
{
    MSG *mess;

    mess = (MSG*)msg;
    //qDebug() << mess->message;
    switch(mess->message){
    case WM_INPUT:
        {
            add_to_raw_mouse_x_and_y((HANDLE)mess->lParam);
            for (int i = 0; i < raw_mouse_count(); i++){
                emit mouseCoord(get_raw_mouse_x_delta(i), get_raw_mouse_y_delta(i),
                                      is_raw_mouse_button_pressed(i, 0), is_raw_mouse_button_pressed(i, 1), is_raw_mouse_button_pressed(i, 2));
            }

        }
        return true;
    }
    return false;
}

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app.h:

#ifndef QAPP_H
#define QAPP_H
 
#include <QApplication>
 
class QApp : public QApplication
{
    Q_OBJECT
public:
    explicit QApp(int & argc, char ** argv );
    //bool winEventFilter(MSG *message, long *result);
     static bool eventFilter(void *msg);
private:
 
signals:
    void mouseCoord(int x, int y, int btn1, int btn2, int btn3);
 
public slots:
 
};
 
#endif // QAPP_H

#ifndef QAPP_H
#define QAPP_H

#include <QApplication>

class QApp : public QApplication
{
    Q_OBJECT
public:
    explicit QApp(int & argc, char ** argv );
    //bool winEventFilter(MSG *message, long *result);
     static bool eventFilter(void *msg);
private:

signals:
    void mouseCoord(int x, int y, int btn1, int btn2, int btn3);

public slots:

};

#endif // QAPP_H

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[wysota]

Why not do it this way?

bool myInputEventFilter(void*);
 
class QApp : public QApplication {
  Q_OBJECT
  friend bool myInputEventFilter(void *);
public:
  QApp(int argc, char **argv) : QApplication(argc, argv){
    init_raw_mouse(1, 0, 1);
    QAbstractEventDispatcher::instance(0)->setEventFilter(myInputEventFilter);
}
signals:
    void mouseCoord(int x, int y, int btn1, int btn2, int btn3);
};
 
// the following function may probably be made static so that it doesn't pollute the namespace
bool myInputEventFilter(void *msg) {
    MSG *mess = (MSG*)msg;
    QApp *app = (QApp*)qApp;
    switch(mess->message){
    case WM_INPUT:
        {
            add_to_raw_mouse_x_and_y((HANDLE)mess->lParam);
            for (int i = 0; i < raw_mouse_count(); i++){
                emit app->mouseCoord(get_raw_mouse_x_delta(i), get_raw_mouse_y_delta(i),
                                      is_raw_mouse_button_pressed(i, 0), is_raw_mouse_button_pressed(i, 1), is_raw_mouse_button_pressed(i, 2));
            }
 
        }
        return true;
    }
    return false;
}

bool myInputEventFilter(void*);

class QApp : public QApplication {
  Q_OBJECT
  friend bool myInputEventFilter(void *);
public:
  QApp(int argc, char **argv) : QApplication(argc, argv){
    init_raw_mouse(1, 0, 1);
    QAbstractEventDispatcher::instance(0)->setEventFilter(myInputEventFilter);
}
signals:
    void mouseCoord(int x, int y, int btn1, int btn2, int btn3);
};

// the following function may probably be made static so that it doesn't pollute the namespace
bool myInputEventFilter(void *msg) {
    MSG *mess = (MSG*)msg;
    QApp *app = (QApp*)qApp;
    switch(mess->message){
    case WM_INPUT:
        {
            add_to_raw_mouse_x_and_y((HANDLE)mess->lParam);
            for (int i = 0; i < raw_mouse_count(); i++){
                emit app->mouseCoord(get_raw_mouse_x_delta(i), get_raw_mouse_y_delta(i),
                                      is_raw_mouse_button_pressed(i, 0), is_raw_mouse_button_pressed(i, 1), is_raw_mouse_button_pressed(i, 2));
            }

        }
        return true;
    }
    return false;
}

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[been_1990]

Great! Working perfectly now. Thanks Wysota.
What do you mean with "pollute the namespace"?

[wysota]

What do you mean with "pollute the namespace"?

Try defining (in a different cpp file) a function called myInputEventFilter and taking a void* as input and you'll see for yourself.