QDialog and QMainWindow Data Transfer

[Ahmad]

TNX EVERYONE FOR UR REPLIES
but i still have problems, the problem is the same, i dont want to get the text that the user types directly when he clicks validerButton, it would have been easy, but i want to pass by a a validation methode, i should test if this is the text that i want... and if it is ok i should pass that text to my MainWindow, otherwise i should always stay in my LoginWindow which is a Modal Dialog, i send u an example of what i want with this... but as always i get a segmentation error
tnx for ur helps and suggestions,

lots of code parts are not concerned with this problem but i send u all of the code and the variable names are in french, so hope u dont get bored with them.. lol