[Qt Creator] error: cannot call member function without object

[jiveaxe]

Hi,
I'm trying Qt Creator for developing my application but build fail with the following error:

error: cannot call member function ‘bool QDir::exists(const QString&) const’ without object

The error points to the if() of the following function:

void AddressbookDialog::on_addPushButton_clicked()
{
    QFile file;
    QString fileName = QDir::homePath() + QDir::separator() + ".kesemes.xml";
 
    if(!QDir::exists(fileName)) {
        //...
    }
    //...
}

void AddressbookDialog::on_addPushButton_clicked()
{
    QFile file;
    QString fileName = QDir::homePath() + QDir::separator() + ".kesemes.xml";

    if(!QDir::exists(fileName)) {
        //...
    }
    //...
}

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This is the constructor:

AddressbookDialog::AddressbookDialog(QWidget *parent) :
    QDialog(parent),
    m_ui(new Ui::AddressbookDialog)
{
    m_ui->setupUi(this);
}

AddressbookDialog::AddressbookDialog(QWidget *parent) :
    QDialog(parent),
    m_ui(new Ui::AddressbookDialog)
{
    m_ui->setupUi(this);
}

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and this is the header:

#ifndef ADDRESSBOOKDIALOG_H
#define ADDRESSBOOKDIALOG_H
 
#include <QtGui/QDialog>
 
namespace Ui {
    class AddressbookDialog;
}
 
class AddressbookDialog : public QDialog {
    Q_OBJECT
    Q_DISABLE_COPY(AddressbookDialog)
public:
    explicit AddressbookDialog(QWidget *parent = 0);
    virtual ~AddressbookDialog();
 
protected:
    virtual void changeEvent(QEvent *e);
 
private:
    Ui::AddressbookDialog *m_ui;
 
private slots:
    void on_closePushButton_clicked();
    void on_addPushButton_clicked();
    void on_editPushButton_clicked();
};
 
#endif // ADDRESSBOOKDIALOG_H

#ifndef ADDRESSBOOKDIALOG_H
#define ADDRESSBOOKDIALOG_H

#include <QtGui/QDialog>

namespace Ui {
    class AddressbookDialog;
}

class AddressbookDialog : public QDialog {
    Q_OBJECT
    Q_DISABLE_COPY(AddressbookDialog)
public:
    explicit AddressbookDialog(QWidget *parent = 0);
    virtual ~AddressbookDialog();

protected:
    virtual void changeEvent(QEvent *e);

private:
    Ui::AddressbookDialog *m_ui;

private slots:
    void on_closePushButton_clicked();
    void on_addPushButton_clicked();
    void on_editPushButton_clicked();
};

#endif // ADDRESSBOOKDIALOG_H

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Where is my error?
Thanks

[Lykurg]

the function of QDir is not static so you have to use:

QDir d;
d.exists("...");

QDir d;
d.exists("...");

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or better use the static QFile::exists() function instead.

[jiveaxe]

You're right.

Many thanks