我最近开始了对大约 2 个月前编写的大型单片音频播放器应用程序进行模块化的繁琐过程。
这个过程进行得相当顺利,尽管其中一种方法(ScrobbleMedia - 可以预见的是它会发出 HTTP 请求以将有关播放轨道的信息提交到 last.fm)似乎不再发出网络请求。
但是,正在正确构建将传递给 QNetworkAccessManager 实例/QNetworkRequest 的 QUrl 对象。
为了比较,代码的功能性 Mercurial 修订版可在 BitBucket 上获得。 .
ScrobbleMedia 方法在重构后目前看起来像这样:
#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() {
}
关联的头文件如下所示:
#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 Windows 7 x86-64 下针对 Qt 库的 4.7.0 版 MinGW 构建(作为 Qt SDK 2010.05 的一部分包含在内)构建应用程序本身。
如有任何帮助,我们将不胜感激。
提前致谢。
最佳答案
在阅读了许多不同的信息来源(其中大部分是相互矛盾的)之后,我发现以下结果是一个有效的解决方案——尽管调试输出中有一个似乎不影响操作的外观问题(Object::connect: No such signal QNetworkReplyImpl::finished(QNetworkReply*) in ../AudioPlayer/scrobblemedia.cpp:29
):
在 scrobblemedia.cpp
中:
#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
中:
#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
感谢大家的帮助。
希望这段代码将来能成为其他人的有用模板。
关于c++ - 重构为独立类后,QNetworkRequest (HTTP GET) 不会触发,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/4922664/