[Qt-interest] Problems with `password dialog' (Detailed)

[Tibor Kiss]

Well, there are plenty of ways to do it, you can share the pointers to the
password/username, or other methods. Here is one, I prefer to do, see the
example below, you send the information back to the mainwindow via signal.

// the password dialog
class pass : public QDialog
{
    Q_OBJECT
public:
    pass (QWidget *parent = 0);
signals:
    void gotpassword(QString, QString);    // we will use this signal
...
};

pass::pass (QWidget *parent) : QDialog (parent)
{
... just set up the UI for the dialog
}

void pass::on_okbutton_clicked ()
{
    ... check the password, if OK ...
    emit gotpassword(username, password);    // fire the signal, the info is
inside...
    close();
}


In the mainwindow, when you create the dialog:

...
pass *dialog = new pass (this);
connect (dialog, SIGNAL (gotpossword(QString, QString)), this, SLOT
(login(QString, QString)));
dialog->exec();
...

And ofcourse, you need a slot in the mainwindow for login

void mainwindow::login(QString username, QString password)
{
    .... do with the username and password whatever you would like ....
}

I hope this helps...
Tibor

2010/3/11 Aaron Lewis <aaron.lewis1989 at gmail.com>

> Here's some more information:
>
>  Actually i'm writing a Mysql Front End , when user triggered the
> `Connection' action ,
>
>  I'd like to show up a new Dialog , and let user type in informations
> (kinds of username , passwd , hostname e.g)
>
>  When she clicked on some button (e.g Yes) , dialog is closed ,  data
> format is checked (isValid)
>   then these information are transfered back to MainWindow (class qsqlcc)
>
>  Now i'll be able to make connection between my program and mysql server
>
> That's what i'm doing ..
>
> Appreciate your help ;-)
>
> Tibor Kiss wrote:
> > Well, the information is a bit short to analyse your problem.
> >
> > First, some typo, I think if you have
> > qgetpass::qgetpass (QWidget *parent , QString *username , QString
> > *passwd , QString *host)
> >
> > then here, you should have a parent:
> > qgetpass *passDialog = new qgetpass(this, &_username,&_passwd,&_host);
> >
> > So, regarding the password problem, I do it like this, it's very
> > simple and usefull:
> >
> > class pass : public QDialog
> > {
> >     Q_OBJECT
> > public:
> >     pass (QWidget *parent = 0);
> > ...
> > nothing extra here, some buttons, etc
> > ...
> > };
> >
> > pass::pass (QWidget *parent) : QDialog (parent)
> > {
> > ... just set up the UI for the dialog
> > }
> >
> > void pass::on_okbutton_clicked ()
> > {
> >     ... check the password ...
> >     done(id);    // return ID of the user
> > }
> >
> > void pass::on_cancel_clicked ()
> > {
> >     done(0);
> > }
> >
> > And finally in the mainwindow:
> >
> > ...
> > pass *dialog = new pass (this);
> > int id = dialog->exec();
> > if (id == 0) return;    // we don't have a positive authentication...
> > ...
> >
> > If you happen to make the password dialog more than once in your
> > program, you should think about it's destruction, because otherwise it
> > will go out of the memory only when you close your mainwindow. You can
> > check QPointer types for the safe delete methods.
> >
> > 2010/3/10 Aaron Lewis <aaron.lewis1989 at gmail.com
> > <mailto:aaron.lewis1989 at gmail.com>>
> >
> >     Hi,
> >        I have a main window, and i want to dynamically create a Dialog to
> >     get informations ( kinds of user-name , password e.g)
> >
> >        I have two classes , qsqlcc and qgetpass.
> >
> >        I tried some sample code:
> >
> >        I) In class getpass , i tried to take advantage of construct
> >     function , tried to pass pointers to it:
> >        qgetpass::qgetpass (QWidget *parent , QString *username , QString
> >     *passwd , QString *host)
> >        ..
> >
> >        II) In MainWindow , in some function
> >
> >        qgetpass *passDialog = new qgetpass(&_username,&_passwd,&_host);
> >
> >        I then will got empty strings . I thought i should use
> >     connections ,
> >     but i've got no ideas..
> >
> >        Any ideas will appreciate .
> >
> >     --
> >     Best Regards,
> >     Aaron Lewis - PGP: 0x4A6D32A0
> >     FingerPrint EA63 26B2 6C52 72EA A4A5 EB6B BDFE 35B0 4A6D 32A0
> >     irc: A4r0n on freenode
> >
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> >
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>
> --
> Best Regards,
> Aaron Lewis - PGP: 0x4A6D32A0
> FingerPrint EA63 26B2 6C52 72EA A4A5 EB6B BDFE 35B0 4A6D 32A0
> irc: A4r0n on freenode
>
>
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