With just the code i post here: http://www.qtcentre.org/threads/3533...-work-properly i can use the debug but now i add some functions to connect to a DB and insert data on it. Now i can's use the debug, i set breakpoins but the debugger never stop on it.

Qt Code: 
  1. #ifndef MAINWINDOW_H
  2. #define MAINWINDOW_H
  3.  
  4. #include <QtGui/QMainWindow>
  5. #include <QProgressBar>
  6. #include <QSqlDatabase>
  7.  
  8. class MainWindow : public QMainWindow
  9. {
  10.     Q_OBJECT
  11.  
  12. public:
  13.     MainWindow(QWidget *parent = 0);
  14.     ~MainWindow();
  15.  
  16. public slots:
  17.     void test();
  18.     void abortButtonClicked();
  19.  
  20. private:
  21.     QProgressBar *progress;
  22.     bool abortButtonFlag;
  23. };
  24.  
  25. #endif // MAINWINDOW_H
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Qt Code: 
  1. #include "mainwindow.h"
  2. #include <QDebug>
  3. #include <QString>
  4. #include <QDir>
  5. #include <QFileDialog>
  6. #include <QMessageBox>
  7. #include <QLabel>
  8. #include <QProgressBar>
  9. #include <QLayout>
  10. #include <QVBoxLayout>
  11. #include <QTimer>
  12. #include <QCoreApplication>
  13. #include <QPushButton>
  14. #include <QSqlDatabase>
  15. #include <QSqlQuery>
  16. #include <QSqlError>
  17.  
  18. MainWindow::MainWindow(QWidget *parent)
  19.     : QMainWindow(parent)
  20. {
  21.  
  22.     QVBoxLayout *layout = new QVBoxLayout;
  23.     progress = new QProgressBar;
  24.     layout->addWidget(progress);
  25.  
  26.     QPushButton *abortButton = new QPushButton("Abort");
  27.     connect(abortButton, SIGNAL(clicked()), this, SLOT(abortButtonClicked()));
  28.     layout->addWidget(abortButton);
  29.  
  30.     QWidget *w=new QWidget();
  31.     w->setLayout(layout);
  32.     this->setCentralWidget(w);
  33.  
  34.     abortButtonFlag = new bool;
  35.     abortButtonFlag = false;
  36.  
  37.     QTimer::singleShot(100, this, SLOT(test()));
  38.  
  39. }
  40.  
  41. MainWindow::~MainWindow()
  42. {
  43.  
  44. }
  45.  
  46. void MainWindow::test(){
  47.  
  48.     QSqlDatabase db = QSqlDatabase::addDatabase("QSQLITE");
  49.     db.setDatabaseName("thomsonkeysDB");
  50.  
  51.     if (db.open()) {
  52.         if (db.tables().indexOf("thomsonkeys") == -1) {
  53.             QSqlQuery query(db);
  54.             query.prepare("CREATE TABLE thomsonkeys (ssid VARCHAR(6), pass VARCHAR(10))");
  55.             if (!query.exec())
  56.                 qCritical() << query.lastError();
  57.         }
  58.     } else {
  59.         qCritical() << db.lastError();
  60.     }
  61.  
  62.     QString dir = QFileDialog::getOpenFileName(this, tr("Select Text File"),"",tr("Text (*.txt)"));
  63.     QFile f(dir);
  64.     f.open(QIODevice::ReadOnly);
  65.     if(f.isOpen())
  66.     {
  67.         int fileSize=f.size();
  68.         int step=fileSize/100;
  69.         int bytesProcessed=0;
  70.         QString line;
  72.         QSqlQuery query(db);
  73.         progress->setMaximum(fileSize);
  74.         progress->setValue(bytesProcessed);
  75.         while ((not f.atEnd()) & (not abortButtonFlag)){
  76.             line = f.readLine().data();
  77.             bytesProcessed+= line.size();
  78.             list = line.split(":");
  79.             query.exec("insert into thomsonkeys values('"+list.at(0)+"', '"+list.at(1)+"')");
  80.             if (bytesProcessed%step<=20){
  81.                 progress->setValue(bytesProcessed);
  82.                 QCoreApplication::processEvents();
  83.             }
  84.         }
  85.         f.close();
  86.         db.close();
  87.         progress->setValue(bytesProcessed);
  88.         progress->setEnabled(false);
  89.     }
  90.     else
  91.     {
  92.         QMessageBox::warning(this,"Error","No file selected!");
  93.     }
  94. }
  95.  
  96. void MainWindow::abortButtonClicked(){
  97.     abortButtonFlag=true;
  98. }
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