小编the*_*nta的帖子

我是C++和Qt的新手.我的问题是,我创建了一个新类,但它没有被编译.所以编译器说:"未解析的对象......".这是标题:

#ifndef TRANSITIOUSPLAYER_H
#define TRANSITIOUSPLAYER_H
#include <QtMultimedia>

class TransitiousPlayer
{

public:
    TransitiousPlayer();
    TransitiousPlayer(const TransitiousPlayer &other);
    ~TransitiousPlayer();

    void play();
};
Q_DECLARE_METATYPE(TransitiousPlayer)
#endif // TRANSITIOUSPLAYER_H

类:

#include "transitiousplayer.h"

...

void TransitiousPlayer::play(){
    QMediaPlayer* player = new QMediaPlayer(this);
    QMediaPlaylist* playlist = new QMediaPlaylist(player);
    playlist->playlist->addMedia(new QString("sh.mp3"));
    player->setPlaylist(playlist);
    player->play();
}

在mainwindow.cpp中:

TransitiousPlayer player;
player.play();

在主要我也打电话:

qRegisterMetaType<TransitiousPlayer>();

如果我只是尝试编译transitiousplayer.cpp,它会说:"目标debug/transitiousplayer.obj不存在."