Error with QList

[gogoi]

Hello friends,I am trying to execute the code given in Qtdocs..

@#include "mainwindow.h"
#include "ui_mainwindow.h"
#include <QtCore/QCoreApplication>
#include <QFileInfo>
#include <QList>
#include <qlist.h>
MainWindow::MainWindow(QWidget *parent)
: QMainWindow(parent), ui(new Ui::MainWindow)
{
ui->setupUi(this);
readSettings();
}

MainWindow::~MainWindow()
{
saveSettings();
delete ui;
}

void MainWindow::readSettings()
{

struct Login {
     QString userName;
     QString password;
 };

template < typename T>;
QList<Login> logins;

 QSettings settings;
 int size = settings.beginReadArray("logins");
 for (int i = 0; i < size; ++i) {
     settings.setArrayIndex(i);
     Login login;
     login.userName = settings.value("userName").toString();
     login.password = settings.value("password").toString();
     logins.append(login);
 }
 settings.endArray();

}

void MainWindow::saveSettings()
{
struct Login {
QString userName;
QString password;
};
template<typename T>;
QList <Login> logins;

 QSettings settings;
 settings.beginWriteArray("logins");
 for (int i = 0; i < logins.size(); ++i) {
     settings.setArrayIndex(i);
     settings.setValue("userName", list.at(i).userName);
     settings.setValue("password", list.at(i).password);
 }
 settings.endArray();
}@

But I am getting the below errors.

bq. error: template argument for 'template<class T> class QList' uses local type 'MainWindow::readSettings()::Login'
error: trying to instantiate 'template<class T> class QList'
error: invalid type in declaration before ';' token
error: request for member 'append' in 'logins', which is of non-class type 'int'

Can anybody help me out ?

Regards
gogoi

[cincirin]

Try to put your Login struct at the beginning of your source code, or in mainwindow.h
Also, is not necessary to instantiate logins object with template<typename T>. If you just write @QList<Login>@ should be ok.

[gogoi]

hey thanks cincirin,for your reply,I declared the struct in class in mainwindow.h and made it public.No I am getting on error as list is not declared..So i declared it below way
QList<QString>list;

But Now again I get a error
bq. error: 'const class QString' has no member named 'userName'
error: 'const class QString' has no member named 'password'

regards
gogoi

[cincirin]

The line @QList<QString>list@ is ok. The problem is elsewhere in your code. Can you show the entire code ? Also why you include QList header twice ?

[gogoi]

Hello cincirin

entire code i have pasted above only.I included headers twicw by mistake,sorry for that..

regards
gogoi

[cincirin]

Ok. I wrote a simple source code as follow:
@
struct Login {
QString userName;
QString password;
};
#include <QSettings>

void readSettings()
{

 QList<Login> logins;

 QSettings settings;
 int size = settings.beginReadArray("logins");
 for (int i = 0; i < size; ++i) {
     settings.setArrayIndex(i);
     Login login;
     login.userName = settings.value("userName").toString();
     login.password = settings.value("password").toString();
     logins.append(login);
 }
 settings.endArray();

}
@

This code work for me.

Also make sure you have included QList and QString headers.

[gogoi]

hey cincirin..I have also written the samething and the error is in savesettings function..
below is my Mainwindow.h

@#ifndef MAINWINDOW_H
#define MAINWINDOW_H

#include <QtGui/QMainWindow>
#include <QSettings>
#include <QList>
#include <qlist.h>

namespace Ui {
class MainWindow;
}

class MainWindow : public QMainWindow
{
Q_OBJECT
public:
struct Login {
QString userName;
QString password;
};

enum ScreenOrientation {
    ScreenOrientationLockPortrait,
    ScreenOrientationLockLandscape,
    ScreenOrientationAuto
};

explicit MainWindow(QWidget *parent = 0);
virtual ~MainWindow();

// Note that this will only have an effect on Symbian and Fremantle.
void setOrientation(ScreenOrientation orientation);

void showExpanded();

private slots:
void on_set_clicked();

private:
Ui::MainWindow *ui;
void readSettings();
void saveSettings();
};

#endif // MAINWINDOW_H@

regards
gogoi

[gogoi]

hello cincirin
in the below function..
I am getting error

@void MainWindow::saveSettings()
{

QList <Login> logins;
QList<QString> list;
 QSettings settings;
 settings.beginWriteArray("logins");
 for (int i = 0; i < logins.size(); ++i) {
     settings.setArrayIndex(i);
     settings.setValue("userName", list.at(i).userName);//error
     settings.setValue("password", list.at(i).password);//error
 }
 settings.endArray();

}@

regards
gogoi

[koahnig]

Hi gogoi

you might have to be a little more specific on your error (message).

[gogoi]

thanks all error is solved..

regards
gogoi

[vinb]

Do you mind to enlight us?
How did you solve your problem?

[cincirin]

Her/His list variable was QList<QString> type and not QList<Login> type.

[gogoi]

hey friends,can anybody help me out in how shall i append the username and passwd data into the list..

regards
gogoi

[cincirin]

"see append function":http://doc.qt.nokia.com/latest/qlist.html#append
In your code ... :
@
QList<Login> loginsList;
Login login = {"userName", "password"};
loginsList.append(login);
@

[gogoi]

ok thanks cincirin,I will read it and get back to u.

regards
gogoi

[gogoi]

hey cincirin,
suppose i want to take username and password from userinput..then how shall i do it..
I mean..

QList<Login> loginsList;
Login login = {ui->lineEdit->text(), ui->lineEdit_2->text()};
loginsList.append(login);

regards
gogoi

[cincirin]

Yes, it's ok.
Or, if you want to add more Logins in your list, create only one instance of Login
@
Login login;

login.userName = ui->lineEdit->text();
login.password = ui->lineEdit_2->text();
loginsList.append(login);

login.userName = ui->lineEdit->text();
login.password = ui->lineEdit_2->text();
loginsList.append(login);
@

[gogoi]

@void MainWindow::readSettings()
{

QList<Login> logins;

   
 QSettings settings;
 int size = settings.beginReadArray("logins");
 for (int i = 0; i < size; ++i) {
     settings.setArrayIndex(i);
     Login login;
     login.userName = settings.value(("userName").toString(),ui->lineEdit->setText());
     login.password = settings.value(("password").toString(),ui->lineEdit_2->settext());
     
     logins.append(login);
 }
 settings.endArray();

}@

can i do it this way cincirin..

regards
gogoi

[cincirin]

No, you can't.
You need to separate @QSettings::value@ from @QlineEdit::setText@
@
void MainWindow::readSettings()
{
QList<Login> logins;
QSettings settings;
int size = settings.beginReadArray("logins");
for (int i = 0; i < size; ++i) {
settings.setArrayIndex(i);
Login login;
login.userName = settings.value(("userName").toString();
ui->lineEdit->setText(login.userName));
login.password = settings.value(("password").toString();
ui->lineEdit_2->settext(login.password));

     logins.append(login);
 }
 settings.endArray();

}
@

[gogoi]

thanks cincirin...then how shall i write in writesettings function..because when i debug..the login size is showing zero only

regards
gogoi