Comments by JohnnyG62 (Top 13 by date)

So where would I put the code to set the text of the dialog fields (or the debug statements) since it cant be done in the constructor?

Well that didn't work. I have a cognitive issue (brain injury), so It's probably me. I may be overlooking something. Below is the revised code based on your suggestions. Perhaps I made a mistake? If you don't have time to waste on this anymore, I understand. Thanks for all your help
-----------------------------------------------------
void LoginDialog::on_btnLogin_clicked()
{
if (!db.open()) {


if (QMessageBox::question(this, "Login Failed",
"Login Failed Retry?", QMessageBox::Yes, QMessageBox::No) == QMessageBox::Yes)
{

done(QMessageBox::Retry);
}
else
{
delete con;

reject(); // same as done(QDialog::Rejected)
}
}
else
{

accept(); // same as done(QDialog::Accepted)
}
}
-----------------------------------------------------
void MainWindow::showDialog()
{
this->hide();
int result = QMessageBox::Retry;

while (result == QMessageBox::Retry)
{
LoginDialogNew *login = new LoginDialogNew(this);
result = login->exec();
delete login;
}



if (result == QDialog::Rejected)
qApp->closeAllWindows();
else{

this->show();


}
}

Getting very close. I understand your code and like the design. One issue, When I click on the retry button, the result passed back to MainWindow is zero not QMessageBox::Retry = 524288. Here is the output of some debug staments

Inside MainWindow
QMessageBox::Retry = 524288

Inside LoginDialog
done(QMessageBox::Retry) = 524288
back in MainWindow
result from login->exec() = 0
I really appreciate your help thus far :-)

I'm sorry if I didn't respond correctly. I'm using the "Have Question or Comment" link. I didn't see a reply button next to the posters name. Anyway. I tied your suggestion but got the folloing compile errors.

The login dialog:
error: 'Retry' is not a member of 'QDialog'
done(QDialog::Retry);
^

error: 'StandardButton' is not a member of 'QDialog'
QDialog::StandardButton result = QDialog::Retry;
^

error: 'Retry' is not a member of 'QDialog'
while (result == QDialog::Retry)
^
error: 'Cancel' is not a member of 'QDialog'
if (result == QDialog::Cancel)

Okay. thanks for the tip !

I'm sorry, I'm not sure what you mean by calling accept(), reject(), or done(int r) can you elaborate? Also what does the 100 returned from m_Login->exec() mean? did you mean QDialog::Done ?

Thanks Jochen, I am new to C++ & QT. This is the first time I've written a class. I thought there could be more other errors. This worked perfectly ! I can't believe I missed calling the QWidget constructor instead of QObject. .This defintely help.

Yes this helped. Thank you

I looked at your link and tried the code example and got many compile errors. I had to remove QT then I reinstalled it using these instructions
http://zetcode.com/gui/qt5/introduction/
then the code I posted above worked.
I guess installing QT from apt-get doesn't install a unusable mysql environment.