Memory Leakage problem.

**bilalsaeed** · 11th February 2011, 20:49

Hi guys,

I execute the following code to make sis file for my Nokia 5800xm, but my phone got hang, and eventually i had to remove the battery to restart my phone. I think the application is not handling the memory leakage,, so please help to get out of this problem.

Qt Code:

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QSystemDeviceInfo file(this);
    QSystemNetworkInfo file1(this);
    ui->progressBar->setValue(file.batteryLevel());
    ui->label->setText("Battery Left: " + QString::number(file.batteryLevel()));
    ui->label_2->setText("IMEI: " + file.imei());
    ui->label_3->setText("Model: " + file.model());
    ui->label_4->setText("Signal Strength: " + QString::number(file1.networkSignalStrength(QSystemNetworkInfo::GsmMode))+ "%");
    ui->label_5->setText("Stand By: " + QString::number(file.batteryLevel()*2) + "mins");
    ui->label_7->setText("Net Name: " + file1.networkName(QSystemNetworkInfo::GsmMode));
    ui->label_8->setText("Cell Id Of BS: " + file1.cellId());
    ui->label_9->setText("Mob Code: " + file1.currentMobileNetworkCode());
    ui->label_10->setText("MAC: " + file1.macAddress(QSystemNetworkInfo::GsmMode));

QSystemDeviceInfo file(this);
    QSystemNetworkInfo file1(this);
    ui->progressBar->setValue(file.batteryLevel());
    ui->label->setText("Battery Left: " + QString::number(file.batteryLevel()));
    ui->label_2->setText("IMEI: " + file.imei());
    ui->label_3->setText("Model: " + file.model());
    ui->label_4->setText("Signal Strength: " + QString::number(file1.networkSignalStrength(QSystemNetworkInfo::GsmMode))+ "%");
    ui->label_5->setText("Stand By: " + QString::number(file.batteryLevel()*2) + "mins");
    ui->label_7->setText("Net Name: " + file1.networkName(QSystemNetworkInfo::GsmMode));
    ui->label_8->setText("Cell Id Of BS: " + file1.cellId());
    ui->label_9->setText("Mob Code: " + file1.currentMobileNetworkCode());
    ui->label_10->setText("MAC: " + file1.macAddress(QSystemNetworkInfo::GsmMode));

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Please Give me chance to say thanks

**high_flyer** · 11th February 2011, 22:06

There is not mem leakage in the code you posted.
If you have memory leak, it is somewhere else in your code.
You should really use some memory checking tool to be sure.

**bilalsaeed** · 12th February 2011, 06:47

Thanks for Reply

Can you please tell me the name of mem checking tools

thanks.

**stampede** · 12th February 2011, 07:31

You can try Valgrind

**bilalsaeed** · 12th February 2011, 09:23

Thanks for reply...

I am using Windows operating system.

@high_flyer:

i am using only that code, but when i try to run it in my nokia 5800 xm, my mobile goes hang. So i think memory leakage is causing the problem

Thanks

**stampede** · 12th February 2011, 09:28

I am using Windows operating system.

You may want to update your profile's OS icon, it says "Unix/X11" now

**high_flyer** · 13th February 2011, 13:19

So i think memory leakage is causing the problem

Why do think that?

Memory leaks usually can cause a crash only when the memory limit is reached and that usually takes some time.
Show the rest of your code, my guess is that something else is causing the crash.

**bilalsaeed** · 13th February 2011, 17:15

high_flyer thanks for your support,

Here's the MainWindow.cpp file

Qt Code:

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#include "mainwindow.h"
#include "ui_mainwindow.h"
 
MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::MainWindow){
 
    ui->setupUi(this);
    ui->label->setShown(false);
    ui->label_2->setShown(false);
    ui->label_3->setShown(false);
    ui->label_4->setShown(false);
    ui->label_5->setShown(false);
    ui->label_6->setShown(false);
    ui->label_7->setShown(false);
    ui->label_8->setShown(false);
    ui->label_9->setShown(false);
    ui->label_10->setShown(false);
    ui->progressBar->setShown(false);
 
}
 
MainWindow::~MainWindow()
{
    delete ui;
}
 
void MainWindow::on_pushButton_clicked()
{
    ui->label->setShown(true);
    ui->label_2->setShown(true);
    ui->label_3->setShown(true);
    ui->label_4->setShown(true);
    ui->label_5->setShown(true);
    ui->label_6->setShown(true);
    ui->label_7->setShown(true);
    ui->label_8->setShown(true);
    ui->label_9->setShown(true);
    ui->label_10->setShown(true);
    ui->progressBar->setShown(true);
 
 
    ui->progressBar->setValue(file.batteryLevel());
    ui->label->setText("Battery Left: " + QString::number(file.batteryLevel()));
    ui->label_2->setText("IMEI: " + file.imei());
    ui->label_3->setText("Model: " + file.model());
    ui->label_4->setText("Signal Strength: " + QString::number(file1.networkSignalStrength(QSystemNetworkInfo::GsmMode))+ "%");
    ui->label_5->setText("Stand By: " + QString::number(file.batteryLevel()*2) + "mins");
    ui->label_7->setText("Net Name: " + file1.networkName(QSystemNetworkInfo::GsmMode));
    ui->label_8->setText("Cell Id Of BS: " + file1.cellId());
    ui->label_9->setText("Mob Code: " + file1.currentMobileNetworkCode());
    ui->label_10->setText("MAC: " + file1.macAddress(QSystemNetworkInfo::GsmMode));
}

#include "mainwindow.h"
#include "ui_mainwindow.h"

MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::MainWindow){

    ui->setupUi(this);
    ui->label->setShown(false);
    ui->label_2->setShown(false);
    ui->label_3->setShown(false);
    ui->label_4->setShown(false);
    ui->label_5->setShown(false);
    ui->label_6->setShown(false);
    ui->label_7->setShown(false);
    ui->label_8->setShown(false);
    ui->label_9->setShown(false);
    ui->label_10->setShown(false);
    ui->progressBar->setShown(false);

}

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

void MainWindow::on_pushButton_clicked()
{
    ui->label->setShown(true);
    ui->label_2->setShown(true);
    ui->label_3->setShown(true);
    ui->label_4->setShown(true);
    ui->label_5->setShown(true);
    ui->label_6->setShown(true);
    ui->label_7->setShown(true);
    ui->label_8->setShown(true);
    ui->label_9->setShown(true);
    ui->label_10->setShown(true);
    ui->progressBar->setShown(true);


    ui->progressBar->setValue(file.batteryLevel());
    ui->label->setText("Battery Left: " + QString::number(file.batteryLevel()));
    ui->label_2->setText("IMEI: " + file.imei());
    ui->label_3->setText("Model: " + file.model());
    ui->label_4->setText("Signal Strength: " + QString::number(file1.networkSignalStrength(QSystemNetworkInfo::GsmMode))+ "%");
    ui->label_5->setText("Stand By: " + QString::number(file.batteryLevel()*2) + "mins");
    ui->label_7->setText("Net Name: " + file1.networkName(QSystemNetworkInfo::GsmMode));
    ui->label_8->setText("Cell Id Of BS: " + file1.cellId());
    ui->label_9->setText("Mob Code: " + file1.currentMobileNetworkCode());
    ui->label_10->setText("MAC: " + file1.macAddress(QSystemNetworkInfo::GsmMode));
}

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networkinfo.pro fil

Qt Code:

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QT       += core gui
Qt += network
 
TARGET = NetworkInfo
TEMPLATE = app
 
 
SOURCES += main.cpp\
        mainwindow.cpp
 
HEADERS  += mainwindow.h \
    ../../Simulator/QtMobility/mingw/include/qmobilityglobal.h
 
FORMS    += mainwindow.ui
 
CONFIG += mobility
MOBILITY = systeminfo
 
symbian {
    TARGET.UID3 = 0xe07c5851
    TARGET.CAPABILITY += LocalServices ReadUserData WriteUserData NetworkServices UserEnvironment ReadDeviceData WriteDeviceData
    TARGET.EPOCSTACKSIZE = 0x14000
    TARGET.EPOCHEAPSIZE = 0x020000 0x800000

QT       += core gui
Qt += network

TARGET = NetworkInfo
TEMPLATE = app


SOURCES += main.cpp\
        mainwindow.cpp

HEADERS  += mainwindow.h \
    ../../Simulator/QtMobility/mingw/include/qmobilityglobal.h

FORMS    += mainwindow.ui

CONFIG += mobility
MOBILITY = systeminfo

symbian {
    TARGET.UID3 = 0xe07c5851
    TARGET.CAPABILITY += LocalServices ReadUserData WriteUserData NetworkServices UserEnvironment ReadDeviceData WriteDeviceData
    TARGET.EPOCSTACKSIZE = 0x14000
    TARGET.EPOCHEAPSIZE = 0x020000 0x800000

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and mainwindow.h header file

Qt Code:

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#ifndef MAINWINDOW_H
#define MAINWINDOW_H
 
#include <QMainWindow>
#include<QtSystemInfo/QSystemDeviceInfo>
#include<QtSystemInfo/QSystemNetworkInfo>
QTM_USE_NAMESPACE
 
namespace Ui {
    class MainWindow;
}
 
class MainWindow : public QMainWindow
{
    Q_OBJECT
 
public:
    explicit MainWindow(QWidget *parent = 0);
    ~MainWindow();
 
private:
    Ui::MainWindow *ui;
    QSystemDeviceInfo file;
    QSystemNetworkInfo file1;
 
private slots:
    void on_pushButton_clicked();
};
 
#endif // MAINWINDOW_H

#ifndef MAINWINDOW_H
#define MAINWINDOW_H

#include <QMainWindow>
#include<QtSystemInfo/QSystemDeviceInfo>
#include<QtSystemInfo/QSystemNetworkInfo>
QTM_USE_NAMESPACE

namespace Ui {
    class MainWindow;
}

class MainWindow : public QMainWindow
{
    Q_OBJECT

public:
    explicit MainWindow(QWidget *parent = 0);
    ~MainWindow();

private:
    Ui::MainWindow *ui;
    QSystemDeviceInfo file;
    QSystemNetworkInfo file1;

private slots:
    void on_pushButton_clicked();
};

#endif // MAINWINDOW_H

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**high_flyer** · 13th February 2011, 18:06

I don't see anything special that should cause a crash.
Run this in a debugger, and see exactly on which line it crashes.

**bilalsaeed** · 13th February 2011, 19:13

Thanksss higg_flyer

It is working perfectly on debugger and doing what it is supposed to do.

In debugger i didn't find anything that cause crash,

Thanks for ur support

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