project crash occur when run in release mode but working properly in debug mode.

[Mohan Raj]

Here i have attached my project pro file code and a pushbutton code. My main issue is when i try to run my project in release mode build and run successfully but when i click a particular pushbutton project is crashed at the same time when i run it in debug mode it completely working properly. please provide me different possibilities to recover this issue.

Pro code:

QT       += core gui sql

QT       += network

greaterThan(QT_MAJOR_VERSION, 4): QT += widgets printsupport

TARGET = BCUID
TEMPLATE = app

# The following define makes your compiler emit warnings if you use
# any feature of Qt which has been marked as deprecated (the exact warnings
# depend on your compiler). Please consult the documentation of the
# deprecated API in order to know how to port your code away from it.
DEFINES += QT_DEPRECATED_WARNINGS

# You can also make your code fail to compile if you use deprecated APIs.
# In order to do so, uncomment the following line.
# You can also select to disable deprecated APIs only up to a certain version of Qt.
#DEFINES += QT_DISABLE_DEPRECATED_BEFORE=0x060000    # disables all the APIs deprecated before Qt 6.0.0

CONFIG += c++17
CONFIG   += extserialport

SOURCES += \
        main.cpp \
        mainwindow.cpp \


HEADERS += \
        mainwindow.h \


FORMS += \
        mainwindow.ui

# Default rules for deployment.
qnx: target.path = /tmp/$${TARGET}/bin
else: unix:!android: target.path = /opt/$${TARGET}/bin
!isEmpty(target.path): INSTALLS += target

QMAKE_CXXFLAGS_RELEASE += -Os
QMAKE_CFLAGS_RELEASE -= -O2

INCLUDEPATH    += /usr/local/include
LIBS += -L/usr/local/lib -lwiringPi -liir

RESOURCES += \
    icons.qrc

/////That crash issue in this particular pushbutton below provided the complete code//////

int MainWindow::on_pushButton_148_clicked()
{
    ui->label_211->setText("Status : ");
    ui->label_340->clear();
    QDir pathDir("/home/pi/Biochemistry_Versions");
    if (pathDir.exists())
    {
        QDir directory("/home/pi/Biochemistry_Versions");
        directory.removeRecursively();
        QProcess *myprocess = new QProcess(this);
        QDir Direct ("/home/pi/");
        qDebug() << Direct ;
        myprocess->setWorkingDirectory("/home/pi/");
        myprocess->start("git clone https://github.com/Instruments04/Biochemistry_Versions.git");
        if (!myprocess->waitForStarted())
        {
            handleProcessError1(myprocess, "The process was stopped due to a poor WiFi signal.");
            return 1;
        }
        qDebug() << "No Error ";
        if ( !myprocess->waitForFinished( -1 ) )
        {
            handleProcessError1(myprocess, "The process was stopped due to a poor WiFi signal.");

            return 0;
        }
        else
        {
            if(myprocess->exitCode()==0)
            {
                QFile file("/home/pi/Biochemistry_Versions/README.md");
                if (file.open(QIODevice::ReadOnly | QIODevice::Text)) {
                    QTextStream in(&file);
                    while (!in.atEnd()) {
                        QString data = in.readLine();
                        bool ok = false;
                        double Version = data.toDouble(&ok);
                        if (ok)
                        {
                            double old_version = ui->label_340->text().toDouble();
                            if(Version>old_version)
                            {
                                ui->label_211->setText("Status : ");
                                ui->label_340->setText("<font color='green'>✅ The new version of the software is now available, kindly upgrade to it.</font>");
                            }
                            else
                            {
                                ui->label_211->setText("Status : ");
                                ui->label_340->setText("<font color='blue'>\u26A0 The software has already been updated to the latest version.</font>");
                            }
                        }
                    }
                    file.close();
                }
                else
                {
                    qDebug()<<"File Not Found";
                }
            }
            else if(myprocess->exitCode()==128)
            {
                handleProcessError1(myprocess, "The process was stopped due to a poor WiFi signal.");
            }
        }
         delete myprocess; // Release memory when you're done
    }
    else {

        QProcess *myprocess = new QProcess(this);
        QDir Direct ("/home/pi/");
        qDebug() << Direct<<"No file" ;
        myprocess->setWorkingDirectory("/home/pi/");
        myprocess->start("git clone https://github.com/Instruments04/Biochemistry_Versions.git");
        if (!myprocess->waitForStarted())
        {
            handleProcessError1(myprocess, "The process was stopped due to a poor WiFi signal.");
            return 1;
        }
        qDebug() << "No Error ";
        if ( !myprocess->waitForFinished( -1 ) )
        {
            handleProcessError1(myprocess, "The process was stopped due to a poor WiFi signal.");
            return 0;
        }
        else
        {
            if(myprocess->exitCode()==0)
            {
                QFile file("/home/pi/Biochemistry_Versions/README.md");
                if (file.open(QIODevice::ReadOnly | QIODevice::Text)) {
                    QTextStream in(&file);
                    while (!in.atEnd()) {
                        QString data = in.readLine();
                        bool ok = false;
                        double Version = data.toDouble(&ok);
                        if (ok)
                        {
                            double old_version = ui->label_340->text().toDouble();
                            if(Version>old_version)
                            {
                                ui->label_211->setText("Status : ");
                                ui->label_340->setText("<font color='green'>✅ The new version of the software is now available, kindly upgrade to it.</font>");
                            }
                            else
                            {
                                ui->label_211->setText("Status : ");
                                ui->label_340->setText("<font color='blue'>\u26A0 The software has already been updated to the latest version.</font>");
                            }
                        }
                    }
                    file.close();
                }
                else
                {
                    qDebug()<<"File Not Found";
                }
            }
            else if(myprocess->exitCode()==128)
            {
                handleProcessError1(myprocess, "The process was stopped due to a poor WiFi signal.");
            }
        }
         delete myprocess; // Release memory when you're done
    }
}

void MainWindow::handleProcessError1(QProcess *process, const QString &errorMessage)
{
    ui->label_211->setText("Status : ");
    ui->label_340->setText("<font color='red'>⚠" + errorMessage + "</font>");
    qDebug() << "Error : " << process->errorString();
}

[jsulm]

@Mohan-Raj This is a lot of code to look at. You should at least try to find out which line of code causes the crash.

Unrelated: the way you're calling external command is not going to work. Please check QProcess documentation to see how to use it properly.

[Mohan Raj]

Thanks for your reply. Actually project is very large this button is point percent of it.
Another one thing..... i have tried all this button function in a separate project with a single pushbutton. its working properly in release mode but its not working when run it in my whole project. And i have checked almost that there is no memory leakage issue is there.

[Mohan Raj]

Sorry for inconvenience. i have posted multiple button codes wrongs. now i edited with the particular button code. now it looks simple when compared with previous.

[SGaist]

Hi,

The usual suspect when debug works and release die is: you are not properly initializing your pointers in your constructor. Debug mode sets them to 0 but not release. Check them all.