QDiaglog, getting the error: ..."was not declared in this scope"

[juliano.gomes]

hello buddies,
I'm trying to implement a QDialog to update data retrieved from a QTableView, so I'm doing this:

#include <QDialog>
void MainWindow::on_tvMain_doubleClicked(const QModelIndex &index)
{
    QSqlDatabase db = QSqlDatabase::addDatabase("QSQLITE");
    db.setDatabaseName("agenda");
    db.open();
 
    QSqlTableModel *model = new QSqlTableModel(this, db);
    model->setTable("departamentos");
    model->setEditStrategy(QSqlTableModel::OnFieldChange);
    model->select();
    QSqlRecord rec = model->record();
 
    QModelIndex sample = ui->tvMain->currentIndex();
    if (sample.row() >= 0 ) {
        QSqlRecord rec = model->record(sample.row());
        NewContact dlg(this);
        dlg.setNome(rec.value("NOME").toString());
        dlg.setSigla(rec.value("SIGLA").toString());
 
        if (dlg.exec() == QDialog::Accepted) {
            rec.setValue("NOME",dlg.nome());
            rec.setValue("SIGLA",dlg.sigla());
            model->setRecord(sample.row(),rec);
        }
    }
}

#include <QDialog>
void MainWindow::on_tvMain_doubleClicked(const QModelIndex &index)
{
    QSqlDatabase db = QSqlDatabase::addDatabase("QSQLITE");
    db.setDatabaseName("agenda");
    db.open();

    QSqlTableModel *model = new QSqlTableModel(this, db);
    model->setTable("departamentos");
    model->setEditStrategy(QSqlTableModel::OnFieldChange);
    model->select();
    QSqlRecord rec = model->record();

    QModelIndex sample = ui->tvMain->currentIndex();
    if (sample.row() >= 0 ) {
        QSqlRecord rec = model->record(sample.row());
        NewContact dlg(this);
        dlg.setNome(rec.value("NOME").toString());
        dlg.setSigla(rec.value("SIGLA").toString());

        if (dlg.exec() == QDialog::Accepted) {
            rec.setValue("NOME",dlg.nome());
            rec.setValue("SIGLA",dlg.sigla());
            model->setRecord(sample.row(),rec);
        }
    }
}

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But i'm getting the following error in line 17:

/home/elementaryos/Projetos/Agenda/Agenda/mainwindow.cpp:78: error: 'NewContact' was not declared in this scope
NewContact dlg(this);
^

/home/elementaryos/Projetos/Agenda/Agenda/mainwindow.cpp:78: error: expected ';' before 'dlg'
NewContact dlg(this);
^

/home/elementaryos/Projetos/Agenda/Agenda/mainwindow.cpp:79: error: 'dlg' was not declared in this scope
dlg.setName(rec.value("name").toString());
^

I've read various threads in this forum, on internet and in qt documentation, but i can't solve this. Can any one give some light?

thanks,
Juliano

[stampede]

Basic C++ - you need to include the header with "NewContact" class declaration.