Program crashes (SIGSEGV Segmentation Fault)

hadifyassin

The Program is basically a login app with a text file as its database.
The Program works fine with the admin username and password, but when I enter the login details from the text file,it crashes. when I debug it says

"The inferior stopped because it received a signal from the operating system.
Signal name: SIGSEGV
Signal meaning: Segmentation fault"

Somebody Please help me with this. THANK YOU in Advance.
Here is my Code(as readable as possible):

 #include "mainwindow.h"
 #include "ui_mainwindow.h"
 #include<QMessageBox>
 #include<QPixmap>
 #include<QFile>
 #include<QTextStream>
 #include"dialog.h"
 MainWindow::MainWindow(QWidget *parent) :
 MainWindow(parent),
ui(new Ui::MainWindow)
 {
ui->setupUi(this);
ui->progressBar->hide();
//ui->label_pic->setMaximumWidth(167);
QPixmap pix("://login.png");
int w=ui->label_pic->width();
int h=ui->label_pic->height();
ui->label_pic->setPixmap(pix.scaled(w,h,Qt::KeepAspectRatio));
 }

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

 void MainWindow::on_pushButton_clicked()
 {
QString name[100],pass[100];
int k;
QFile user(".data.txt");
QString username=ui->lineEdit_username->text(),password=ui->lineEdit_password->text();

    QTextStream in(&user);
    for(int i=0;!in.atEnd();i++)
    {
        in>>name[i]>>pass[i];//read from text
    }
    user.close();
    for(int i=0;i<100;i++)
    {
        if((name[i]==username)&&(pass[i]==password))//comparing entered values
        {
            k=i;
            goto bo;
        }
        else
            if(ui->lineEdit_username->text()=="hadifyassin"&&ui->lineEdit_password->text()=="Hadif123")//admin username and password
                goto yo;
    }
    bo:
    if((username==name[k])&&(password==pass[k])){
        ui->progressBar->show();
        ui->statusBar->showMessage("Login Successful",5000);
        ui->progressBar->setValue(100);
        hide();
        //QMessageBox::information(this,"Success","Logged In");
        Dialog *secDialog;
        secDialog = new Dialog(this);
        secDialog->show();}//show second window
 else{


        yo:
        if((ui->lineEdit_username->text()=="hadifyassin"&&ui->lineEdit_password->text()=="Hadif123"))//admin
        {
            ui->progressBar->show();
            ui->statusBar->showMessage("Login Successful",5000);
            ui->progressBar->setValue(100);
            hide();
            //QMessageBox::information(this,"Success","Logged In");
            m = new menu(this);
            m->show();//show admin window
        }
    else
    {
        ui->statusBar->showMessage("Login unsuccessful",5000);
        QMessageBox::warning(this,"Failed","Username or Password Incorrect");
        hide();
        reg=new Register(this);
        reg->show();//register
    }
 }
 }

 void MainWindow::on_pushButton_2_clicked()
 {
hide();
reg=new Register(this);
reg->show();//register
 }

mrjj

Hi
Use the debugger.
Single step through the code
and find the line that makes your app crash.

hadifyassin

I am soo sorry for asking such a silly dumb question. The problem was just that the file wasn't open. I fixed it. Thank you soo much for your help. I feel soo silly!

mrjj

@hadifyassin
Well thats happens to most of us from time to time :)
Where there is action, there will be Whoops ;)