Re: [PyKDE] Newbie PyQt question

[Ulrich Berning]

Andreas Pauley schrieb:
Hi all,
I've started writing an app (point of sale) that needs to first show a 
login dialog (and succesfully authenticate a user) before showing the 
main window.

I've managed to do this, but my program fails to exit and return to 
the command prompt whenever the authentication failed and the main 
window never gets showed. The login window closes, but the command I 
use to start the app (python main.py) just hangs until I manually kill 
the proccess.
The problem doesn't occur when the program exits after the main window 
is shown.

I'm using QT 3.3.3 with PyQt 3.13.
Regards,
Andreas
After closing the login window, the application is waiting for events in 
qapp.exec_loop but you don't have any window that can generate events. 
The login window is a modal dialog with it's own exec_loop.

---
Try the following changes:
1.) In qtforms/loginbase[.ui/.py] remove the connection from the OK 
button to the accept slot.

2.) Change the class Login in login.py
class Login(LoginBase):
   def __init__(self, poswindow):
       LoginBase.__init__(self)
-       self.authenticated = False
       self.poswindow = poswindow
   def authenticate(self):
       username=str(self.lnedUsername.text())
       password=str(self.lnedPassword.text())
       user=User.getUser(username, password)
       if user:
           self.poswindow.show()
-           self.authenticated = True
+           self.accept()
       else:
           self.authenticated = False
           QMessageBox.warning(None,
               self.trUtf8("Login Incorrect"),
               self.trUtf8("""The user id and password you entered is 
incorrect."""),
               None,
               None,
               None,
               0, -1)
+           # If the authentication fails, the whole application ends as 
requested.
+           # Do this only, if the user shouldn't get a second chance.
+           # Normally, the user should be able to try it again.
+           self.reject()
-       return self.authenticated
          

3.) Change the login method in the class QualityPos in qualitypos.py
class QualityPOS(QualityPOSBase):
   def login(self):
       loginwindow = Login(self)
       loginwindow.show()
-       loginwindow.exec_loop()
+       return loginwindow.exec_loop()
4.) Change main.py:
   qapp = QApplication(sys.argv)
   QObject.connect(qapp,SIGNAL("lastWindowClosed()"),qapp,SLOT("quit()"))
   poswindow = QualityPOS()
   qapp.setMainWidget(poswindow)
-   qapp.exec_loop()
+   if poswindow.login() == QDialog.Accepted:
+       qapp.exec_loop()
---
Now it should work as desired.
Ulli

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