发送信号时未调用Qt C ++插槽

Question

After debugging, I'm sure that the replyFinish() slot is not called when I call this->getNetReply(). These are my files, in the main() fumction I call the getNetReply this way: Networking a; a.getNetReply(); I did add QT+=network to my qmake. Please help me. Thank you very much.

my networking.cpp file

#include "networking.h"
#include <QUrl>
#include <QNetworkRequest>

// constructor    

void Networking::getNetReply(){
    QNetworkAccessManager *man  = new QNetworkAccessManager(this);
    QObject::connect(man, SIGNAL(finished(QNetworkReply *)), this, SLOT(replyFinished(QNetworkReply *)));
    qDebug() << "connected";
    QNetworkRequest req;
    req.setUrl(QUrl("http://www.google.com"));
    man->get(req);

}
// this method not called
void Networking::replyFinished(QNetworkReply *reply){
    QByteArray data = reply->readAll();
    QString str = QString(data);
    this->netRep = str;
    code = reply->attribute(QNetworkRequest::HttpStatusCodeAttribute).toInt();
}

my networking.h header file:

#ifndef NETWORKING_H
#define NETWORKING_H

#include <QObject>
#include <QNetworkAccessManager>
#include <QNetworkReply>

class Networking : public QObject
{
    Q_OBJECT
public:
    QString netRep;
    int code;
    explicit Networking(QObject *parent = 0);
    void getNetReply();

public slots:
    void replyFinished(QNetworkReply*);

};

#endif // NETWORKING_H

Answer 1

The get() function returns a QNetworkReply object. Connect to the error signal of that object and it will tell you if an error happens (and which).