why my inline ui function call create segmentation fault when i call it from other class ?

Qt embedded developer

i am calling below function from other class to set message box dynamically but it create segmentation fault at "delete pGasLable ". i don't know what is reason behind that i want to know why this happen. how to remove segmentation fault?

inline void MSG_BOX(QWidget* parent,QString sMessage, QString sButtonText)
{
      qDebug()<<"Profile updated successfully at 372"<<__LINE__;
    QFont font("Open Sans", 14);
    qDebug()<<"Profile updated successfully at 372"<<__LINE__;

    QFont qButtonFont("Open Sans", 16, QFont::Bold);
    qDebug()<<"Profile updated successfully at 372"<<__LINE__;

    const QSize btn_size1 = QSize(300,80);
    qDebug()<<"Profile updated successfully at 372"<<__LINE__;

    QFrame *FrameMessageBox = new QFrame(parent);
    qDebug()<<"Profile updated successfully at 372"<<__LINE__;

    FrameMessageBox->setGeometry(0,0,480,800);
    qDebug()<<"Profile updated successfully at 372"<<__LINE__;

    FrameMessageBox->show();
    qDebug()<<"Profile updated successfully at 372"<<__LINE__;

    FrameMessageBox->setStyleSheet("background-color: rgba(0, 0, 0, 0.5);border-radius:10px;");
    qDebug()<<"Profile updated successfully at 372"<<__LINE__;

    QMessageBox * msgBox = new QMessageBox(QMessageBox::NoIcon, "", "", QMessageBox::Ok,FrameMessageBox, Qt::FramelessWindowHint);
    qDebug()<<"Profile updated successfully at 372"<<__LINE__;

    QLabel *pGasLable = new QLabel(msgBox);
    qDebug()<<"Profile updated successfully at 372"<<__LINE__;

    QString sStringhtml =  "<html>"
                           "<head>"
                           "</style>"
                           "</head>"
                           "<body>"
                           "<p><p align=\'center\'><span style= \""+QString("font-family:'Open Sans';font-weight:400;font-size:14pt;")+"\">"+(sMessage)+"</span><p align=\"center\">"
                           "</body></html>";

    qDebug()<<"Profile updated successfully at 372"<<__LINE__;

    pGasLable->setTextFormat(Qt::RichText);
    qDebug()<<"Profile updated successfully at 372"<<__LINE__;

    pGasLable->setText(sStringhtml);
    qDebug()<<"Profile updated successfully at 372"<<__LINE__;

    pGasLable->setTextInteractionFlags(Qt::NoTextInteraction);
    qDebug()<<"Profile updated successfully at 372"<<__LINE__;

    pGasLable->setWordWrap(true);
    qDebug()<<"Profile updated successfully at 372"<<__LINE__;

    pGasLable->setAlignment(Qt::AlignCenter);
    qDebug()<<"Profile updated successfully at 372"<<__LINE__;

    pGasLable->setStyleSheet("Padding-top: 10px;background-color: rgb(255, 255, 255);");
    qDebug()<<"Profile updated successfully at 372"<<__LINE__;

    pGasLable->setGeometry(MSGLBL_STARTX, MSGLBL_STARTY, MSGLBL_WIDTH, MSGLBL_HEIGHT);
    qDebug()<<"Profile updated successfully at 372"<<__LINE__;

    msgBox->setStyleSheet("QMessageBox { background-color: rgb(255, 255, 255);border-radius:10px;}"
                         "QLabel{min-height:80px; max-height:80px; min-width:280px; max-width:300px;border-radius:10px;}"); // msgBox->setText("<center>Machine Configuration Saved</center>");

    qDebug()<<"Profile updated successfully at 372"<<__LINE__;

    msgBox->setFont(font);
    qDebug()<<"Profile updated successfully at 372"<<__LINE__;

    msgBox->button(QMessageBox::Ok)->setText(sButtonText);
    qDebug()<<"Profile updated successfully at 372"<<__LINE__;

    msgBox->button(QMessageBox::Ok)->setStyleSheet("border: none;color: rgb(0, 0, 0);background-color: #FFBF00; background-repeat: no-repeat;position: center;border-radius:10px;");
    qDebug()<<"Profile updated successfully at 372"<<__LINE__;

    msgBox->button(QMessageBox::Ok)->setMinimumSize(btn_size1);
    qDebug()<<"Profile updated successfully at 372"<<__LINE__;

    msgBox->button(QMessageBox::Ok)->setMaximumSize(btn_size1);
    qDebug()<<"Profile updated successfully at 372"<<__LINE__;

    msgBox->button(QMessageBox::Ok)->setFont(qButtonFont);
    qDebug()<<"Profile updated successfully at 372"<<__LINE__;

#if 1       //To add border-radius
    int radius = 10;
    qDebug()<<"Profile updated successfully at 372"<<__LINE__;

    int width = 324;
    qDebug()<<"Profile updated successfully at 372"<<__LINE__;

    int height = 192;
    qDebug()<<"Profile updated successfully at 372"<<__LINE__;

    QRegion verticalRegion(0, radius, width, height - (2 * radius));
    qDebug()<<"Profile updated successfully at 372"<<__LINE__;

    QRegion horizontalRegion(radius, 0, width - (2 * radius), height);
    qDebug()<<"Profile updated successfully at 372"<<__LINE__;

    QRegion circle(0, 0, 2 * radius, 2 * radius, QRegion::Ellipse);
    qDebug()<<"Profile updated successfully at 372"<<__LINE__;

    QRegion region = verticalRegion.united(horizontalRegion);
    qDebug()<<"Profile updated successfully at 372"<<__LINE__;

    region = region.united(circle);
    qDebug()<<"Profile updated successfully at 372"<<__LINE__;

    region = region.united(circle.translated(width - (2 * radius), 0));
    qDebug()<<"Profile updated successfully at 372"<<__LINE__;

    region = region.united(circle.translated(width - (2 * radius), height - (2 * radius)));
    qDebug()<<"Profile updated successfully at 372"<<__LINE__;

    region = region.united(circle.translated(0, height - (2 * radius)));
    qDebug()<<"Profile updated successfully at 372"<<__LINE__;

    msgBox->setMask(region);
    qDebug()<<"Profile updated successfully at 372"<<__LINE__;

#endif
    qDebug()<<"Profile updated successfully at 372"<<__LINE__;

    msgBox->exec();
    qDebug()<<"Profile updated successfully at 372"<<__LINE__;

    delete pGasLable;
    qDebug()<<"Profile updated successfully at 372"<<__LINE__;

    delete msgBox;
    qDebug()<<"Profile updated successfully at 372"<<__LINE__;

    delete FrameMessageBox;
    qDebug()<<"Profile updated successfully at 372"<<__LINE__;

}

jsulm

@Qt-embedded-developer said in why my inline ui function call create segmentation fault when i call it from other class ?:

delete pGasLable

Why do you delete it?
You should not delete widgets like that, do

pGasLable->deleteLater();

instead.
Also, if you set parent then DO NOT DELETE IT! It will be deleted as soon as parent is deleted. If you delete it by yourself you get a double delete! Please read https://doc.qt.io/qt-5/objecttrees.html

Qt embedded developer

@jsulm in one parent class this function get called multiple time so i have used delete. so in this case what will you suggest ?

jsulm

@Qt-embedded-developer said in why my inline ui function call create segmentation fault when i call it from other class ?:

so i have used delete

But you don't have to delete all widgets manually. When you delete msgBox it will delete all its children including pGasLable.
You should really read the link I gave you, parent-child is one of the core concepts in Qt.

Qt embedded developer

@jsulm Thanks

Qt embedded developer

@jsulm Hi !

i have seen that this function does not create segmentation fault in other class. it works properly but it happens in my one class only.

i have printed line number to find out segmentation fault. and i found out last line number before line "delete pGasLable" , after that line number not get printed. so i think it created segmentation fault. so can you refer me right link to find out segmentation fault in case qt programs

jsulm

@Qt-embedded-developer said in why my inline ui function call create segmentation fault when i call it from other class ?:

so can you refer me right link to find out segmentation fault in case qt programs

There is nothing special about Qt here. Simply use the debugger.
And I already said several times: if a QObject based object has a parent you DO NOT HAVE to delete it explicitly, it will be deleted as soon as its parent is deleted. I also posted this link for you to read (and you should really do!): https://doc.qt.io/qt-5/objecttrees.html
A heave nothing to add to this topic...

Qt embedded developer

@jsulm i have read it yesterday. i removed delete statement. and segmentation fault gone.

but now in that function it not wait for user action to click on ok button. so what is solution of this problem ?

jsulm

@Qt-embedded-developer said in why my inline ui function call create segmentation fault when i call it from other class ?:

so what is solution of this problem ?

Please post the current code, this issue has nothing to do with object deletion.
It should wait here:

msgBox->exec();

as exec() is a blocking call.

Qt embedded developer

@jsulm

#include "FuelCheckProfileUpdate.h"
#include "ui_FuelCheckProfileUpdate.h"
#include "CommonClass/AppMain.h"
#include "FuelCheck.h"
#include "MainScreen.h"
inline void MSG_BOX11(QWidget* parent,QString sMessage, QString sButtonText)
{
    QFont font("Open Sans", 14);
    QFont qButtonFont("Open Sans", 16, QFont::Bold);

    const QSize btn_size1 = QSize(300,80);

    QFrame *FrameMessageBox = new QFrame(parent);
    FrameMessageBox->setGeometry(0,0,480,800);
    FrameMessageBox->show();
    FrameMessageBox->setStyleSheet("background-color: rgba(0, 0, 0, 0.5);border-radius:10px;");

    QMessageBox * msgBox = new QMessageBox(QMessageBox::NoIcon, "", "", QMessageBox::Ok,FrameMessageBox, Qt::FramelessWindowHint);

    QLabel *pGasLable = new QLabel(msgBox);
    QString sStringhtml =  "<html>"
                           "<head>"
                           "</style>"
                           "</head>"
                           "<body>"
                           "<p><p align=\'center\'><span style= \""+QString("font-family:'Open Sans';font-weight:400;font-size:14pt;")+"\">"+(sMessage)+"</span><p align=\"center\">"
                           "</body></html>";

    pGasLable->setTextFormat(Qt::RichText);
    pGasLable->setText(sStringhtml);
    pGasLable->setTextInteractionFlags(Qt::NoTextInteraction);
    pGasLable->setWordWrap(true);
    pGasLable->setAlignment(Qt::AlignCenter);
    pGasLable->setStyleSheet("Padding-top: 10px;background-color: rgb(255, 255, 255);");
    pGasLable->setGeometry(MSGLBL_STARTX, MSGLBL_STARTY, MSGLBL_WIDTH, MSGLBL_HEIGHT);

    msgBox->setStyleSheet("QMessageBox { background-color: rgb(255, 255, 255);border-radius:10px;}"
                         "QLabel{min-height:80px; max-height:80px; min-width:280px; max-width:300px;border-radius:10px;}"); // msgBox->setText("<center>Machine Configuration Saved</center>");

    msgBox->setFont(font);
    msgBox->button(QMessageBox::Ok)->setText(sButtonText);
    msgBox->button(QMessageBox::Ok)->setStyleSheet("border: none;color: rgb(0, 0, 0);background-color: #FFBF00; background-repeat: no-repeat;position: center;border-radius:10px;");
    msgBox->button(QMessageBox::Ok)->setMinimumSize(btn_size1);
    msgBox->button(QMessageBox::Ok)->setMaximumSize(btn_size1);
    msgBox->button(QMessageBox::Ok)->setFont(qButtonFont);

#if 1       //To add border-radius
    int radius = 10;
    int width = 324;
    int height = 192;

    QRegion verticalRegion(0, radius, width, height - (2 * radius));
    QRegion horizontalRegion(radius, 0, width - (2 * radius), height);
    QRegion circle(0, 0, 2 * radius, 2 * radius, QRegion::Ellipse);

    QRegion region = verticalRegion.united(horizontalRegion);
    region = region.united(circle);
    region = region.united(circle.translated(width - (2 * radius), 0));
    region = region.united(circle.translated(width - (2 * radius), height - (2 * radius)));
    region = region.united(circle.translated(0, height - (2 * radius)));

    msgBox->setMask(region);
#endif

    msgBox->exec();

    if(IS_VALID_OBJ(pGasLable))
    {
        pGasLable->deleteLater();
    }

    if (IS_VALID_OBJ(pGasLable))
    {
        msgBox->deleteLater();
    }

    if (IS_VALID_OBJ(pGasLable))
    {
        FrameMessageBox->deleteLater();
    }

}

#define X_SECONDS_TO_SHOW 5

FuelCheckProfileUpdate::FuelCheckProfileUpdate(QWidget *parent) :
    QWidget(parent),
    ui(new Ui::FuelCheckProfileUpdate)
{
    ui->setupUi(this);
    ui->lblProgress->setVisible(false);
    bIsRequiredToUpdateFirmware = false;

    timer=new QTimer(this);
    QFont font;
    font.setFamily(FONT_FAMILY_AWESOME);
    font.setPixelSize(28);
    font.setPixelSize(44);

    u16OldFirmware = 0;
    u16FwToUpdate = 0;
    u16NewFirmware = 0;
    u8BlinkCounter=X_SECONDS_TO_SHOW;

    FwUpdateProcess();

    QTimer::singleShot(1000,this, SLOT(UpdateFirmware()));

    QObject::connect(timer, SIGNAL(timeout()), this, SLOT(FwUpdateFail()));
    timer->start(500);


  //  QObject::connect(&qFwFailTimer, SIGNAL(timeout()), this, SLOT(FwUpdateFail()));
}

FuelCheckProfileUpdate::~FuelCheckProfileUpdate()
{
    if(timer->isActive())
       timer->stop();

    QObject::disconnect(timer, SIGNAL(timeout()), this, SLOT(FwUpdateFail()));

    pMainApp.ObjSettings.eScreenStatus = SCREEN_MAIN;

    if( pMainApp.ObjSettings.bIsCritiCalFailed == true)
    {
        pMainApp.ObjHwControl.ObjLed.OnOff(RedLed);
    }
    else
    {
        pMainApp.ObjHwControl.ObjLed.OnOff(GreenLed);
    }

    MainScreen* parent = qobject_cast<MainScreen*>(this->parent());
    parent->LaserModuleFirmwareUpgrade();
    delete ui;
}

void FuelCheckProfileUpdate::FwUpdateFail()
{
    u8BlinkCounter=u8BlinkCounter-1;

    ui->lblProgress->show();


    QString sMessage = "<html><head/><body><p align=\"center\"><span style=\" font-size:16pt; font-weight:400;\">"+sUpdatingFuelGaugeProfile()+" </span></p>"
                       "<p align=\"center\"><span style=\" font-size:16pt; font-weight:400;\">Profile From Version </span>"
                       "<span style=\" font-size:16pt;\">"+ sCurrentFuelGaugeFirmwareValue +"</span><span style=\" font-size:16pt; font-weight:400;\"> to </span>"
                       "<span style=\" font-size:16pt;\">"+ sNewFuelGaugeFirmwareValue +"</span></p></body></html>";

    if(u8BlinkCounter%2 == 0)
    {
    ui->lblProgress->setText(sMessage);
    }
    else
    {
        QString sMessage = "<html><head/><body><p align=\"center\"><span style=\" font-size:16pt; font-weight:400;\">"+sUpdatingFuelGaugeProfile()+" </span></p>"
                           "<p align=\"center\"><span style=\" font-size:16pt; font-weight:400;\">Profile From Version </span>"
                           "<span style=\" font-size:16pt;\">"+ sCurrentFuelGaugeFirmwareValue +"</span><span style=\" font-size:16pt; font-weight:400;\"> to </span>"
                           "<span style=\" font-size:16pt;\">"+ sNewFuelGaugeFirmwareValue +"</span></p></body></html>";

       ui->lblProgress->setText(sMessage);
    }

    if(u8BlinkCounter==0)
    {  timer->stop();
       this->deleteLater();
    }
}

void FuelCheckProfileUpdate::FwUpdateProcess()
{
    bIsRequiredToUpdateFirmware = false;
if(GetFwVersionToUpdate())
    {
        //2. Get Current version
        if(GetFirmwareVersion(u16OldFirmware) == true)
        {
           sOldFuelGaugeFirmwareValue = QString::number(u16OldFirmware);

            if(u16FwToUpdate != u16OldFirmware)
            {
                bIsRequiredToUpdateFirmware = true;

            }
        }
    }
}

bool FuelCheckProfileUpdate::GetFirmwareVersion(u_int16_t &u16GotFwVersion)
{
  bool bStatus = false;
    unsigned char pData[36];
    char text1[4];
    u16OldFirmware = 0;
    if(pMainApp.ObjSettings.ObjFuelCheck.gauge_read_firmware(pMainApp.ObjSettings.ObjFuelCheck.nI2CId,0x0100,pData,36) == 0)
    {
        text1[0] = pData[2];
        text1[1] = pData[3];
        text1[2] = pData[4];
        text1[3] = '\0';
        sCurrentFuelGaugeFirmwareValue = text1;
        u16GotFwVersion = sCurrentFuelGaugeFirmwareValue.toInt();

#ifdef QDEBUG_ENABLE
        pMainApp.ObjSettings.DebugStation("Existing Fuel Gauge profile version :"+sCurrentFuelGaugeFirmwareValue);
#endif
        bStatus = true;
    }

    return bStatus;
}

bool FuelCheckProfileUpdate::GetFwVersionToUpdate()
{
    bool bStatus = false;
    u16FwToUpdate = 0;
    QString sFwUpdateFilePath = SOURCE_FILE;

    do
    {
        if(sFwUpdateFilePath.isEmpty())
        {
#ifdef QDEBUG_ENABLE
            pMainApp.ObjSettings.DebugStation(sInvalidFilePath());
            MSG_BOX1(this, sInvalidFilePath(), sOk());
#endif
            break;
        }
        else
        {
            FILE *fp;
            int errnum;

            char ra[50],text[4];

                fp = fopen(SOURCE_FILE,"r");

                    if( fp == NULL)
                    {
                        errnum = errno;

                        fprintf(stderr, "Value of errno: %d\n", errno);

                        perror("Error printed by perror");

                        fprintf(stderr, "Error opening file: %s\n", strerror( errnum ));

                    }
                    else
                    {

                       fseek(fp, -543, SEEK_END);
                        //fflush(ra);
                       fgets ( ra, 50, fp );
                        if( fclose(fp) == 0)
                        {
                            if((ra[0]=='3')&&(ra[3]=='3')&&(ra[6]=='3'))
                            {
                                if(((ra[1]>='0') &&  (ra[1]<='9')) && ((ra[4]>='0') &&  (ra[4]<='9')) &&((ra[7]>='0') &&  (ra[7]<='9')))
                                {
                                    text[0] = ra[1];
                                    text[1] = ra[4];
                                    text[2] = ra[7];
                                    text[3] = '\0';
                                    sNewFuelGaugeFirmwareValue = text;
                                    u16FwToUpdate = sNewFuelGaugeFirmwareValue.toInt();
#ifdef QDEBUG_ENABLE
        pMainApp.ObjSettings.DebugStation("Source file Fuel Gauge profile version :"+sNewFuelGaugeFirmwareValue);
#endif

                                }
                                else
                                {
#ifdef QDEBUG_ENABLE
        pMainApp.ObjSettings.DebugStation("golden image not recognized");
#endif
                                }


                            }
                            else
                            {
#ifdef QDEBUG_ENABLE
        pMainApp.ObjSettings.DebugStation("golden image not recognized");
#endif
                            }
                        }

                    }


        }

        bStatus = true;
    }while(false);
    return bStatus;
}

bool FuelCheckProfileUpdate::UpdateFirmware()
{
    bool bStatus = false;
     pMainApp.ObjSettings.DebugStation("sCurrentFuelGaugeFirmwareValue" + sCurrentFuelGaugeFirmwareValue);
     pMainApp.ObjSettings.DebugStation("sNewFuelGaugeFirmwareValue" + sNewFuelGaugeFirmwareValue);

    if ( sCurrentFuelGaugeFirmwareValue != sNewFuelGaugeFirmwareValue )
    {
        do
        {
            pMainApp.ObjSettings.eScreenStatus = SCREEN_FWUPDATE;
#ifdef QDEBUG_ENABLE
        pMainApp.ObjSettings.DebugStation("Golden image update process started");
#endif
            int nSourceFile;
            struct stat st;
            char *pFileBuffer;

            stat(SOURCE_FILE,&st);

            if((nSourceFile= open(SOURCE_FILE,O_RDONLY))<  0)
            {
#ifdef QDEBUG_ENABLE
        pMainApp.ObjSettings.DebugStation("Can not open Golden image Source file");
#endif
                return bStatus;
            }

            pFileBuffer =(char *)malloc(st.st_size);

            if (!pFileBuffer)
                return bStatus;

            read(nSourceFile, pFileBuffer, st.st_size);
            ::close(nSourceFile);
            QString str =pMainApp.ObjSettings.ObjFuelCheck.gauge_execute_fs(pMainApp.ObjSettings.ObjFuelCheck.nI2CId, pFileBuffer);

            if(GetFwVersionToUpdate())
            {
                pMainApp.ObjSettings.ObjFuelCheck.bIsFuelCheckOn=pMainApp.ObjSettings.ObjFuelCheck.gauge_init();

                if ( pMainApp.ObjSettings.ObjFuelCheck.bIsFuelCheckOn)
                {

                    int Percentage = -1;
                    bool bisFuelConnected = true;
                    for(UINT8 u8loop =0; u8loop < 3 ; u8loop++)
                    {
                        if(pMainApp.ObjSettings.ObjFuelCheck.gauge_cmd_read(pMainApp.ObjSettings.ObjFuelCheck.nI2CId, 0x2c) > 0) //SOC in [%]
                        {
                            Percentage = pMainApp.ObjSettings.ObjFuelCheck.u16Datareceived;
                        }
                        else
                        {
                            pMainApp.ObjSettings.bIsFuelCheckPassed=false;
                            qDebug()<<"Fuel gauge not found";


#ifdef QDEBUG_ENABLE
                            pMainApp.ObjSettings.DebugStation("Fuel gauge not found");
#endif
                            return bStatus;
                        }
                        QThread::msleep(100);
                        if((Percentage < 0) && (Percentage > 100))
                        {
                            bisFuelConnected = false;
                            qDebug()<<"Fuel gauge found but wrong percentarge detected : " + QString::number(Percentage);

#ifdef QDEBUG_ENABLE
                            pMainApp.ObjSettings.DebugStation("Fuel gauge found but wrong percentarge detected : " + QString::number(Percentage));
#endif
                        }
                    }
                    if(bisFuelConnected == true)
                    {
                        qDebug()<<"Battery percentage" + QString::number(Percentage);
#ifdef QDEBUG_ENABLE
                        pMainApp.ObjSettings.DebugStation("Battery percentage" + QString::number(Percentage));
#endif
                        pMainApp.ObjSettings.bIsFuelCheckPassed=true;
                        pMainApp.ObjSettings.ObjFuelCheck.nResult  = Percentage;
                    }
                }
                else
                {
                    pMainApp.ObjSettings.bIsFuelCheckPassed=false;
                }
                //2. Get Current version
                if(GetFirmwareVersion(u16OldFirmware) == true)
                {
                    if(u16FwToUpdate == u16OldFirmware)
                    {
                        pMainApp.ObjSettings.bIsFuelGaugeFirmWareUpdateRequire = false;

#ifdef QDEBUG_ENABLE
                        pMainApp.ObjSettings.DebugStation("Profile updated successfully");
#endif
                        pMainApp.ObjHwControl.ObjSounder.SetAlarmLevel(AlarmLevel1);
                        QString  sMessage = "<html><head/><body><p align=\"center\"><span style=\" font-size:12pt; font-weight:400;\">"+sFuelGaugeProfile() +"</span>"
                                                                                                                                                                "<span style=\" font-size:12pt;\"><br/></span>"
                                                                                                                                                                "<span style=\" font-size:12pt; font-weight:400;\">From </span><span style=\" font-size:12pt;\">"+sOldFuelGaugeFirmwareValue +"</span>"
                                                                                                                                                                                                                                                                                                  "<span style=\" font-size:12pt; font-weight:400;\"> To </span><span style=\" font-size:12pt;\">"+sNewFuelGaugeFirmwareValue +" "+sSuccessfully() +".</span></p>"
                                                                                                                                                                                                                                                                                                                                                                                                                                                    "<p align=\"center\"><span style=\" font-size:12pt; font-weight:600;\">" "</span></p></body></html>";

                        MSG_BOX1(this, sMessage, sOk());
                        //  pMainApp.ObjSettings.bIsLaserModuleFirmwareUpdate = true;
                        //  pMainApp.ObjSettings.UpdateConfig(SETTING_ISLASERMODULEFIRMWAREUPDATE, QString::number(pMainApp.ObjSettings.bIsLaserModuleFirmwareUpdate));
                        pMainApp.ObjHwControl.ObjSounder.SetAlarmLevel(SounderOFF);

                    }
                    else
                    {
                        pMainApp.ObjHwControl.ObjSounder.SetAlarmLevel(AlarmLevel1);
                        MSG_BOX1(this, sFuelGaugeProfileUpdateFail(), sOk());
                        pMainApp.ObjHwControl.ObjSounder.SetAlarmLevel(SounderOFF);
                        this->deleteLater();
                    }
                }
            }

            if(str == '\0' || str == "")
            {

                qDebug()<<"Profile updated successfully" <<str;
            }
            else
            {
                qDebug()<<"Profile updation failed"<<str;
            }

            free(pFileBuffer);
            bStatus = true;

        }     while(false);
        return bStatus;
    }
    return false;
}

jsulm

@Qt-embedded-developer said in why my inline ui function call create segmentation fault when i call it from other class ?:

msgBox->exec();

It should wait here for user to close dialog. So, what exactly is not working?

Qt embedded developer

@jsulm

In my above mentioned class's slot FwUpdateFail() used
below statement so parent delete messagebox function before click on okay.

if(u8BlinkCounter==0)
{ timer->stop();
this->deleteLater(); // THIS LINE CAUSE PROBLEM
}

So i have commented it and i have added "this->deleteLater()" statement in UpdateFirmware slot before return statment.

Thank you jsulm for solve problem correctly.

jsulm

@Qt-embedded-developer said in why my inline ui function call create segmentation fault when i call it from other class ?:

i think solution is i need to delete 'this' in destructor

What? Destructor is called just before "this" is deleted! You should read about memory management in C++.

I don't really understand what you are doing, sorry. No idea why you have a timer and why you want to delete "this"? It just makes no sense...