My project works on Qt Simulator, but not on my real device.

[GeorgeDao123]

Here is my project:

clean.h

#include <QtGui/QApplication>
#include "qmlapplicationviewer.h"
#include <QObject>
#include <QApplication>
#include <QDeclarativeView>
#include <QDeclarativeContext>
 
#ifndef CLEAN_H
#define CLEAN_H
 
 
class Clean : public QObject {
    Q_OBJECT
public:
    explicit Clean(QObject *parent = 0); ~Clean();
 
    //void deleteDir();
    //void deleteFile();
 
    Q_INVOKABLE void clean1();
};
 
#endif // CLEAN_H

#include <QtGui/QApplication>
#include "qmlapplicationviewer.h"
#include <QObject>
#include <QApplication>
#include <QDeclarativeView>
#include <QDeclarativeContext>

#ifndef CLEAN_H
#define CLEAN_H


class Clean : public QObject {
    Q_OBJECT
public:
    explicit Clean(QObject *parent = 0); ~Clean();

    //void deleteDir();
    //void deleteFile();

    Q_INVOKABLE void clean1();
};

#endif // CLEAN_H

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clean.cpp

#include <QtGui/QApplication>
#include "qmlapplicationviewer.h"
#include <QObject>
#include <QApplication>
#include <QDeclarativeView>
#include <QDeclarativeContext>
#include <QFile>
#include <QDir>
#include "clean.h"
 
void deleteDir(const std::string& foldername) {
  QDir dir;
  dir.remove(foldername.c_str());
}
 
void deleteFile(const std::string& filename) {
  QFile file;
  file.remove(filename.c_str());
}
 
Clean::Clean(QObject *parent) : QObject(parent) {
}
 
Clean::~Clean() {
}
 
void Clean::clean1() {
    deleteDir(e:/data);
    deleteFile(e:/qf)
}

#include <QtGui/QApplication>
#include "qmlapplicationviewer.h"
#include <QObject>
#include <QApplication>
#include <QDeclarativeView>
#include <QDeclarativeContext>
#include <QFile>
#include <QDir>
#include "clean.h"

void deleteDir(const std::string& foldername) {
  QDir dir;
  dir.remove(foldername.c_str());
}

void deleteFile(const std::string& filename) {
  QFile file;
  file.remove(filename.c_str());
}

Clean::Clean(QObject *parent) : QObject(parent) {
}

Clean::~Clean() {
}

void Clean::clean1() {
    deleteDir(e:/data);
    deleteFile(e:/qf)
}

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main.cpp

#include "clean.h"
 
int main(int argc, char *argv[])
{
    QApplication app(argc, argv);
 
    Clean clean;
 
    QDeclarativeView view;
    view.setResizeMode(QDeclarativeView::SizeRootObjectToView);
    view.rootContext()->setContextProperty("Clean", &clean);
    view.setSource(QUrl("qml/GCleaner/main.qml"));
 
    return app.exec();
}

#include "clean.h"

int main(int argc, char *argv[])
{
    QApplication app(argc, argv);

    Clean clean;

    QDeclarativeView view;
    view.setResizeMode(QDeclarativeView::SizeRootObjectToView);
    view.rootContext()->setContextProperty("Clean", &clean);
    view.setSource(QUrl("qml/GCleaner/main.qml"));

    return app.exec();
}

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main.qml

Button {
    id:button
    onClicked: Clean.clean1()
}

Button {
    id:button
    onClicked: Clean.clean1()
}

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It works very well on Qt Simulator, but not work on my mobile device. I also tried to add qdir.h and qfile.h but it exited with code -1073741819.

What should I do? Thank you so much for your help.

[wysota]

What kind of device? What exactly happens?

[GeorgeDao123]

My device is Nokia E6, OS is Belle.

When I open this app on phone from Main Menu, it does not show anything. The screen goes blank then the Main Menu is refreshed.

Thanks for your help.

[wysota]

I think your program simply crashes. You need to debug it and see what's wrong.

[GeorgeDao123]

It says that:

Debugging starts
QDeclarativeDebugServer: Ignoring "-qmljsdebugger=port:3768,block". Debugging has not been enabled.
Debugging has finished.

[wysota]

Try harder

[GeorgeDao123]

I have tried all things I know but it's still not solved.

I study Qt myself and no one in my region can help me, sir. Should I go to Qt4.8? The current Qt version that I am using is 4.7.4.

[wysota]

You should make sure that you build your project in debug mode and that you have prepared your device for debugging. I'm sure there are documents about it in the internet.

[GeorgeDao123]

Okay sir. I shall try again then tell everything here. Thank you so much for your help.

Sincerely.