重構為獨立類后，不會觸發QNetworkRequest（HTTP GET）

Question

我最近開始了大約2個月前編寫的模塊化大型，單片音頻播放器應用程序的繁瑣過程。

盡管似乎其中一種方法（ScrobbleMedia-可預知的足以使HTTP請求將有關播放曲目的信息提交到last.fm）似乎不再發出網絡請求，但此過程進行得相當不錯。

但是，將正確傳遞將傳遞給QNetworkAccessManager實例/ QNetworkRequest的QUrl對象。

為了進行比較，可以在BitBucket上使用功能性的Mercurial代碼修訂版。

重構后，ScrobbleMedia方法當前如下所示：

#include "scrobblemedia.h"

#include <QDebug>
#include <cstdio>

ScrobbleMedia::ScrobbleMedia(QString asUsername, QString asPassword,
                         QString asArtist, QString asTrack, QString asAlbum)
{

    QString KEndPointURL = "http://lastfmstats.livefrombmore.com/universalscrobbler/scrobble.php";
    QUrl iScrobbleEndPoint(KEndPointURL);

      QNetworkAccessManager *iScrobbleDispatcher = new QNetworkAccessManager(this);


iScrobbleEndPoint.addQueryItem("submissionType","track");
iScrobbleEndPoint.addQueryItem("username", asUsername);
iScrobbleEndPoint.addQueryItem("password", asPassword);
iScrobbleEndPoint.addQueryItem("artist", asArtist);
iScrobbleEndPoint.addQueryItem("track", asTrack);
iScrobbleEndPoint.addQueryItem("album", asAlbum);
iScrobbleEndPoint.addQueryItem("number","1");
iScrobbleEndPoint.addQueryItem("duration","200");

iScrobbleDispatcher->get(QNetworkRequest(iScrobbleEndPoint));
connect(iScrobbleDispatcher, SIGNAL(finished(QNetworkReply*)),
 SLOT(replyFinished(QNetworkReply*)));

// QString Outside = iScrobbleEndPoint.toEncoded();

qDebug()  << "Received: " + 
  asUsername + " " + 
   asPassword + " " + 
    asArtist + " " +
     asTrack + " " + 
      asAlbum;

qDebug() << iScrobbleEndPoint.toString();

}

ScrobbleMedia::~ScrobbleMedia() {

}

關聯的頭文件如下所示：

#ifndef SCROBBLEMEDIA_H
#define SCROBBLEMEDIA_H

#include <QString>
#include <QtNetwork>
#include <QUrl>
#include <QNetworkAccessManager>



class ScrobbleMedia : public QObject
{
     Q_OBJECT;


private:

public:

    ScrobbleMedia(QString asUsername, QString asPassword, QString asArtist, QString asTrack, QString asAlbum);
    ~ScrobbleMedia();

};

#endif // SCROBBLEMEDIA_H

我目前正在針對Windows 7 x86-64下Qt庫的4.7.0版（包含在Qt SDK 2010.05中）的MinGW版本構建應用程序本身。

任何援助將不勝感激。

提前致謝。

Answer 1

在閱讀了許多不同的信息源（其中大多數是矛盾的）之后，我發現以下結果導致了可行的解決方案-盡管調試輸出中出現了外觀問題，但似乎並不影響操作（ Object::connect: No such signal QNetworkReplyImpl::finished(QNetworkReply*) in ../AudioPlayer/scrobblemedia.cpp:29 : Object::connect: No such signal QNetworkReplyImpl::finished(QNetworkReply*) in ../AudioPlayer/scrobblemedia.cpp:29 ）：

在scrobblemedia.cpp ：

#include "scrobblemedia.h"

#include <QDebug>
#include <cstdio>

ScrobbleMedia::ScrobbleMedia(QString asUsername, QString asPassword,
                             QString asArtist, QString asTrack, QString asAlbum)
{

    QByteArray iDataSink;
    QEventLoop iLoop;

    QString KEndPointURL = "http://lastfmstats.livefrombmore.com/universalscrobbler/scrobble.php";
    QUrl iScrobbleEndPoint(KEndPointURL);

    iScrobbleEndPoint.addQueryItem("submissionType","track");
    iScrobbleEndPoint.addQueryItem("username", asUsername);
    iScrobbleEndPoint.addQueryItem("password", asPassword);
    iScrobbleEndPoint.addQueryItem("artist", asArtist);
    iScrobbleEndPoint.addQueryItem("track", asTrack);
    iScrobbleEndPoint.addQueryItem("album", asAlbum);
    iScrobbleEndPoint.addQueryItem("number","1");
    iScrobbleEndPoint.addQueryItem("duration","200");

    QNetworkAccessManager iScrobbleDispatcher;
    QNetworkRequest iScrobbleRequest(iScrobbleEndPoint);
    QNetworkReply *iScrobbleReply = iScrobbleDispatcher.get(iScrobbleRequest);

    QObject::connect(iScrobbleReply, SIGNAL(finished(QNetworkReply*)), &iLoop,
     SLOT(quit()));

    iDataSink = iScrobbleReply->readAll();

    qDebug()  << "Received: " + asUsername + " " + asPassword + " " + asArtist + " " + asTrack + " " + asAlbum;

    qDebug() << iScrobbleEndPoint.toString();

    iLoop.exec();
}

ScrobbleMedia::~ScrobbleMedia() {

}

void ScrobbleMedia::replyFinished(QNetworkReply*) {

}

void ScrobbleMedia::reallyDone() {

    qDebug() << "We've probably successfully Scrobbled...";
}

在scrobblemedia.h ：

#ifndef SCROBBLEMEDIA_H
#define SCROBBLEMEDIA_H

#include <QString>
#include <QtNetwork>
#include <QUrl>
#include <QNetworkAccessManager>



class ScrobbleMedia : public QObject
{
     Q_OBJECT


private:


public:

    ScrobbleMedia(QString asUsername, QString asPassword, QString asArtist, QString asTrack, QString asAlbum);
    ~ScrobbleMedia();

private slots:
    void replyFinished(QNetworkReply*);
    void reallyDone();

};

#endif // SCROBBLEMEDIA_H

感謝大家的幫助。

希望此代碼將來可以作為其他代碼的有用模板。