QT no matching function for call to 'MainWindow::connect() - qt

Question

I have MainWindow and QNAMRedirect classes and I am trying to compile program but getting compiler error.
Here is QNAMRedirect class:
class QNAMRedirect : public QObject
{
Q_OBJECT
public:
explicit QNAMRedirect(QObject *parent = 0);
~QNAMRedirect();
signals:
public slots:
void doRequest();
void replyFinished(QNetworkReply* reply);
signals:
void finished(QString);
private:
QPointer<QNetworkAccessManager> _qnam;
QUrl _originalUrl;
QUrl _urlRedirectedTo;
QNetworkAccessManager* createQNAM();
};
and here is MainWindow class:
namespace Ui {
class MainWindow;
}
class MainWindow : public QMainWindow
{
Q_OBJECT
public:
explicit MainWindow(QWidget *parent = 0);
~MainWindow();
private slots:
void on_request_clicked();
private:
Ui::MainWindow *ui;
};
and i am trying to connect NAMRedirect::finished(QString) signal to QTextEdit widget in MainWindow this way:
void MainWindow::on_request_clicked()
{
QNAMRedirect urlGet(this);
QObject::connect(urlGet,SIGNAL(finished(QString)),ui->textEdit,SLOT(setText(QString)));
urlGet.doRequest();
}
but i am getting compiler error:
error: no matching function for call to 'MainWindow::connect(QNAMRedirect&, const char*, QTextEdit*&, const char*)'
how can i fix that?

Answer 1

The reason for the compile error is that the two objects you pass to the connect() function need to be pointers. So using &urlGet (instead of just urlGet) will fix your compile error. However, as soon as your function returns this object will go out of scope and be destroyed, so I suggest you change your function to look something more like this:
QNAMRedirect *urlGet = new QNAMRedirect( this )
QObject::connect(urlGet,SIGNAL(finished(QString)),ui->textEdit,SLOT(setText(QString)));
urlGet->doRequest();
You will, of course, need to take measure that you're not leaking memory here.