Hi to all,
This is my first post and I'm trying to learn QT and understand the model/view stuff. Apologies for the long code.
I've set up a Dialog project and this is my code

In dialog.h

Qt Code: 
  1. private slots:
  2.     void on_pushButtonA_clicked();
  3.     void rowClicked(const QModelIndex &index);
  4.  
  5. private:
  6.     Ui::Dialog *ui;
  9.     QItemSelectionModel *selectModel;
  10.  
  11. =========================
  12.  
  13. In dialog.cpp
  14. void Dialog::on_pushButtonA_clicked()
  15. {
  16.     ui->textBrowser->clear();
  17.     ui->pushButtonC->setFocus();
  18.     this->model = new QSqlQueryModel();
  19.     model->setQuery("SELECT id, mot, tag, def FROM aTable");
  20.     ui->treeView->setModel(model);
  21.  
  22.     ui->treeView->hideColumn(0);
  23.     ui->treeView->hideColumn(2);
  24.     ui->treeView->hideColumn(3);
  25.  
  26.     ui->treeView->scrollToTop();
  27.  
  28.     connect(ui->treeView, SIGNAL(pressed(const QModelIndex &)), this, SLOT(rowClicked(const QModelIndex &)));
  29.  
  30.     ui->lblWords->setText(QString("0"));
  31.     QString thisquery = "SELECT COUNT (*) FROM aTable";
  32.     QSqlQuery query;
  33.     int numRecs = 0;
  34.     if(!query.exec(thisquery) || !query.next() == true){
  35.         QSqlError err = query.lastError();
  36.         QMessageBox::critical(0, "Query COUNT(*) failed on aTable...", err.text());
  37.     }
  38.     else{
  39.         numRecs = query.value(0).toInt();
  40.     }
  41.     ui->lblWords->setText(QString::number(numRecs));
  42. }
  43.  
  44.  
  45.  
  46.  
  47. void Dialog::rowClicked(const QModelIndex &index)
  48. {
  49.     int row = index.row();
  50.     QString id = model->record(row).value("id").toString();
  51.     QString mot = model->record(row).value("mot").toString();
  52.     QString tag = model->record(row).value("tag").toString();
  53.     QString def = model->record(row).value("def").toString();
  54.  
  55.     ui->textBrowser->clear();    
  56.     ui->textBrowser->append("<font color='blue'>" + mot + "</font>");
  57.     ui->textBrowser->append(mot);
  58.     ui->textBrowser->append("");
  59.     ui->textBrowser->append(" " + tag);
  60.     ui->textBrowser->append("");
  61.     ui->textBrowser->append(def);
  62.  
  63.     QTextCursor cursor = ui->textBrowser->textCursor();
  64.     cursor.setPosition(0);
  65.     ui->textBrowser->setTextCursor(cursor);
  66. }
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This works but when I try the same with a QMainWindow project changing the following:

Qt Code: 
  1. Dialog version - .h file
  2.     void on_pushButtonA_clicked();
  3.     void rowClicked(const QModelIndex &index);
  4.  
  5. QMainWindow version .h file
  6.     void on_actionA_triggered();
  7.     void rowClicked(const QModelIndex &index);
  8.  
  9.  
  10. Dialog version - .cpp file
  11. void Dialog::on_pushButtonA_clicked()
  12. etc
  13.  
  14. void Dialog::rowClicked(const QModelIndex &index)
  15. etc
  16.  
  17.  
  18. QMainWindow version .cpp file
  19. void MainWindow::on_actionA_triggered()
  20. etc
  21.  
  22. void rowClicked(const QModelIndex &index)
  23. etc
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I get these errors
E:\Bird\splash1\mainwindow.cpp:-1: In function 'void rowClicked(const QModelIndex&)':
E:\Bird\splash1\mainwindow.cpp:181: error: 'model' was not declared in this scope
E:\Bird\splash1\mainwindow.cpp:186: error: 'ui' was not declared in this scope
E:\Bird\splash1\mainwindow.cpp:181: warning: unused variable 'id' [-Wunused-variable]

Again, apologies for the long code and thanks in advance for any advice offered