"no matching function for call to 'UserCreationDialog::Connect(..."

[Leutzig]

Hi,

I have two classes, UserConfiguration and UserCreationDialog, in my C++ Qt Project. I need to make a connection between a signal from UserCreationDialog, when OK button is pressed and the slot update() in UserConfiguration. The connection is seen in my code below. But when I build, I get the error:

"[...] usercreationdialog.cpp:13: error: no matching function for call to 'UserCreationDialog::connect(UserCreationDialog*, const char*, UserConfiguration**, const char*)'     connect(this, SIGNAL(updateUserConfig()),&uconf,SLOT(update()));"

"[...] usercreationdialog.cpp:13: error: no matching function for call to 'UserCreationDialog::connect(UserCreationDialog*, const char*, UserConfiguration**, const char*)'     connect(this, SIGNAL(updateUserConfig()),&uconf,SLOT(update()));"

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^

UserCreationDialog.h

#ifndef USERCREATIONDIALOG_H
#define USERCREATIONDIALOG_H
#include <QDialog>
 
class UserConfiguration;
 
namespace Ui {
class UserCreationDialog;
}
 
class UserCreationDialog : public QDialog
{
    Q_OBJECT
 
public:
    explicit UserCreationDialog(QWidget *parent = 0);
    ~UserCreationDialog();
 
private slots:
    void on_buttonBox_accepted();
 
private:
    Ui::UserCreationDialog *ui;
    UserConfiguration *uconf;
    QSqlDatabase* fv_db;
 
signals:
    void updateUserConfig();
};
 
#endif // USERCREATIONDIALOG_H

#ifndef USERCREATIONDIALOG_H
#define USERCREATIONDIALOG_H
#include <QDialog>

class UserConfiguration;

namespace Ui {
class UserCreationDialog;
}

class UserCreationDialog : public QDialog
{
    Q_OBJECT

public:
    explicit UserCreationDialog(QWidget *parent = 0);
    ~UserCreationDialog();

private slots:
    void on_buttonBox_accepted();

private:
    Ui::UserCreationDialog *ui;
    UserConfiguration *uconf;
    QSqlDatabase* fv_db;

signals:
    void updateUserConfig();
};

#endif // USERCREATIONDIALOG_H

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UserCreationDialog.cpp

#include "usercreationdialog.h"
#include "ui_usercreationdialog.h"
#include "userconfiguration.h"
 
UserCreationDialog::UserCreationDialog(QWidget *parent) :
    QDialog(parent),
    ui(new Ui::UserCreationDialog)
{
    ui->setupUi(this);
 
    connect(this, SIGNAL(updateUserConfig()),&uconf,SLOT(update()));
}
 
UserCreationDialog::~UserCreationDialog()
{
    delete ui;
}
 
void UserCreationDialog::on_buttonBox_accepted()
{
    QString uid = ui->userIDLineEdit->text();
    QString pw = ui->passwordLineEdit->text();
    writeUserToDb(uid,pw, *fv_db);
    emit updateUserConfig();
    close();
}

#include "usercreationdialog.h"
#include "ui_usercreationdialog.h"
#include "userconfiguration.h"

UserCreationDialog::UserCreationDialog(QWidget *parent) :
    QDialog(parent),
    ui(new Ui::UserCreationDialog)
{
    ui->setupUi(this);

    connect(this, SIGNAL(updateUserConfig()),&uconf,SLOT(update()));
}

UserCreationDialog::~UserCreationDialog()
{
    delete ui;
}

void UserCreationDialog::on_buttonBox_accepted()
{
    QString uid = ui->userIDLineEdit->text();
    QString pw = ui->passwordLineEdit->text();
    writeUserToDb(uid,pw, *fv_db);
    emit updateUserConfig();
    close();
}

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Some irrelevant code is left out from the shown code above.

// Leutzig

[anda_skoa]

"uconf" already is a pointer, the & in your connect() call makes it a pointer to a pointer.

Cheers,
_

[Leutzig]

Thanks anda_skoa

---

Added after 1 33 minutes:

I actually have a different problem with my connect(). I got rid of the error before but now my application crashes when it reaches the connect(), and I get the message "The program has unexpectedly finished". Am I connecting my signal and slot correctly or?

UserCreationDialog.h

#ifndef USERCREATIONDIALOG_H
#define USERCREATIONDIALOG_H
 
#include <QDialog>
#include "dbinterface.h"
 
class UserConfiguration;
 
namespace Ui {
class UserCreationDialog;
}
 
class UserCreationDialog : public QDialog
{
    Q_OBJECT
 
public:
    explicit UserCreationDialog(QWidget *parent = 0);
    ~UserCreationDialog();
 
private slots:
    void on_buttonBox_accepted();
 
private:
    Ui::UserCreationDialog *ui;
    UserConfiguration *uconf;
    QSqlDatabase* fv_db;
 
signals:
    void updateUserConfig();
};
 
#endif // USERCREATIONDIALOG_H

#ifndef USERCREATIONDIALOG_H
#define USERCREATIONDIALOG_H

#include <QDialog>
#include "dbinterface.h"

class UserConfiguration;

namespace Ui {
class UserCreationDialog;
}

class UserCreationDialog : public QDialog
{
    Q_OBJECT

public:
    explicit UserCreationDialog(QWidget *parent = 0);
    ~UserCreationDialog();

private slots:
    void on_buttonBox_accepted();

private:
    Ui::UserCreationDialog *ui;
    UserConfiguration *uconf;
    QSqlDatabase* fv_db;

signals:
    void updateUserConfig();
};

#endif // USERCREATIONDIALOG_H

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UserCreationDialog.cpp

#include "usercreationdialog.h"
#include "ui_usercreationdialog.h"
#include "userconfiguration.h"
 
UserCreationDialog::UserCreationDialog(QWidget *parent) :
    QDialog(parent),
    ui(new Ui::UserCreationDialog)
{
    ui->setupUi(this);
 
    connect(this, SIGNAL(updateUserConfig()), uconf, SLOT(updateUC()));
}
 
UserCreationDialog::~UserCreationDialog()
{
    delete ui;
}
 
void UserCreationDialog::on_buttonBox_accepted()
{
    QString uid = ui->userIDLineEdit->text();
    QString pw = ui->passwordLineEdit->text();
    writeUserToDb(uid,pw, *fv_db);
    emit updateUserConfig();
    delete this;
}

#include "usercreationdialog.h"
#include "ui_usercreationdialog.h"
#include "userconfiguration.h"

UserCreationDialog::UserCreationDialog(QWidget *parent) :
    QDialog(parent),
    ui(new Ui::UserCreationDialog)
{
    ui->setupUi(this);

    connect(this, SIGNAL(updateUserConfig()), uconf, SLOT(updateUC()));
}

UserCreationDialog::~UserCreationDialog()
{
    delete ui;
}

void UserCreationDialog::on_buttonBox_accepted()
{
    QString uid = ui->userIDLineEdit->text();
    QString pw = ui->passwordLineEdit->text();
    writeUserToDb(uid,pw, *fv_db);
    emit updateUserConfig();
    delete this;
}

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The slot updateUConf() is found in the UserConfiguration class, so no need to show that.

// Leutzig

[d_stranz]

And where do you set the value of "uconf" that is used in your connect() statement? As far as I can see in your code, it is an uninitialized pointer.

[Leutzig]

That's right, I haven't initialized the pointer. Thanks

// Leutzig