c++ - 错误 : no matching function for call to 'QNetworkAccessManager::QNetworkAccessManager(Networking* const)'

Question

这是我的文件。我对此有一些疑问。

   // networking.h

#ifndef NETWORKING_H
#define NETWORKING_H

#include <QNetworkReply>

class Networking
{
public:
    Networking();
    void getNetReply();
    void replyFinished(QNetworkReply*);
};

#endif // NETWORKING_H




//networking.cpp
#include "networking.h"
#include <QtNetwork/QNetworkAccessManager>
#include <QUrl>
#include <QNetworkRequest>
#include <QObject>

Networking::Networking()
{
}

void Networking::getNetReply(){
    QNetworkAccessManager * man;
    man = new QNetworkAccessManager(this);
    qDebug() << "Getting content..." << endl;

    QNetworkRequest request(QUrl("http://www.google.pl"));
    qDebug() << "Network request..." << endl;

    QNetworkReply * NetRepl;
    QObject::connect(man, SIGNAL(finished(QNetworkReply *)), this, SLOT(replyFinished(QNetworkReply*)));

    NetRepl = man->get(request);
    qDebug() << "Network reply..." << endl;

    qDebug() << "Connecting..." << endl;

}

void Networking::replyFinished(QNetworkReply* reply){
    // my code
    reply->readAll();
}

我的错误信息。我在谷歌上搜索了很多并阅读了文档:

error: no matching function for call to QNetworkAccessManager::QNetworkAccessManager(Networking* const) man = new QNetworkAccessManager(this);

20: error: no matching function for call to QObject::connect(QNetworkAccessManager*&, const char*, Networking* const, const char*) QObject::connect(man, SIGNAL(finished(QNetworkReply *)), this, SLOT(replyFinished(QNetworkReply*)));

Answer 1

将Q_OBJECT 宏添加到您的类中，无需;

class Networking : public QObject
{
Q_OBJECT
public:
    Networking();
    void getNetReply();

并重建所有项目

如果没有这个宏，moc 将无法找到您的类，您也无法使用信号/槽机制。此外，您的类应该显式或隐式地从 QObject 派生。