C++ File::isOpen方法代码示例

void MainWindow::on_pushOpenFolder_clicked()
{
    m_notUsed.clear();
    QString dir = QFileDialog::getExistingDirectory(this, tr("Open MP3 Source Directory"),
                                                    pSet->value("src_dir").toString(), QFileDialog::ShowDirsOnly | QFileDialog::DontResolveSymlinks);

    if (!dir.isEmpty())
    {
        pSet->setValue("src_dir", dir);

        ui->lineSrcFolder->setText(dir);
        cleanTags();

        QDir mp3Dir(dir, "*.mp3");
        QStringList files = mp3Dir.entryList();
        TagLib::MPEG::File* ptlFile;

        foreach (QString file, files)
        {
            QString path = QString("%1/%2").arg(mp3Dir.absolutePath()).arg(file);

            ptlFile = new TagLib::MPEG::File(reinterpret_cast<const wchar_t *>(path.utf16()));

            if (ptlFile && ptlFile->isOpen())
            {
                tagFiles.append(ptlFile);
            }
            else if(ptlFile)
            {
                m_notUsed.append(path);
                delete ptlFile;
            }
        }

/*!
 * \brief Read the albumart image from the file
 *
 * \param filename The filename for which we want to find the length.
 * \param type The type of image we want - front/back etc
 * \returns A pointer to a QImage owned by the caller or NULL if not found.
 */
QImage* MetaIOID3::getAlbumArt(QString filename, ImageType type)
{
    QImage *picture = new QImage();

    AttachedPictureFrame::Type apicType
        = AttachedPictureFrame::FrontCover;

    switch (type)
    {
        case IT_UNKNOWN :
            apicType = AttachedPictureFrame::Other;
            break;
        case IT_FRONTCOVER :
            apicType = AttachedPictureFrame::FrontCover;
            break;
        case IT_BACKCOVER :
            apicType = AttachedPictureFrame::BackCover;
            break;
        case IT_CD :
            apicType = AttachedPictureFrame::Media;
            break;
        case IT_INLAY :
            apicType = AttachedPictureFrame::LeafletPage;
            break;
        default:
            return picture;
    }

    QByteArray fname = filename.toLocal8Bit();
    TagLib::MPEG::File *mpegfile = new TagLib::MPEG::File(fname.constData());

    if (mpegfile)
    {
        if (mpegfile->isOpen()
            && !mpegfile->ID3v2Tag()->frameListMap()["APIC"].isEmpty())
        {
            TagLib::ID3v2::FrameList apicframes =
                                    mpegfile->ID3v2Tag()->frameListMap()["APIC"];

            for(TagLib::ID3v2::FrameList::Iterator it = apicframes.begin();
                it != apicframes.end(); ++it)
            {
                AttachedPictureFrame *frame =
                                    static_cast<AttachedPictureFrame *>(*it);
                if (frame && frame->type() == apicType)
                {
                    picture->loadFromData((const uchar *)frame->picture().data(),
                                          frame->picture().size());
                    return picture;
                }
            }
        }

        delete mpegfile;
    }

    delete picture;

    return NULL;
}

/*!
* \brief Open the file to read the tag
*
* \param filename The filename
* \returns A taglib file object for this format
*/
TagLib::MPEG::File *MetaIOID3::OpenFile(const QString &filename)
{
    QByteArray fname = filename.toLocal8Bit();
    TagLib::MPEG::File *mpegfile = new TagLib::MPEG::File(fname.constData());

    if (!mpegfile->isOpen())
    {
        delete mpegfile;
        mpegfile = NULL;
    }

    return mpegfile;
}

void LocalSong::setInfo(const QString &filePath)
{
    QFileInfo fileInfo(filePath);
    fileExtension = fileInfo.completeSuffix();
    QString singer="";
    QString sname="";
    QString album="";
    QImage covpic;
    if(fileExtension == "m4a")
    {

        TagLib::MP4::File *mp4File = new TagLib::MP4::File(
                    QFile::encodeName(filePath).constData());
        if(false==mp4File->isOpen())
            return;
        sname=QString(mp4File->tag()->title().toCString(true));
        singer=QString(mp4File->tag()->artist().toCString(true));
        album=QString(mp4File->tag()->album().toCString(true));
        TagLib::MP4::ItemListMap itemListMap = mp4File->tag()->itemListMap();
        TagLib::MP4::Item albumArtItem = itemListMap["covr"];
        TagLib::MP4::CoverArtList albumArtList = albumArtItem.toCoverArtList();
        TagLib::MP4::CoverArt albumArt = albumArtList.front();
        QImage cover;
        cover.loadFromData((const uchar *)
                           albumArt.data().data(),
                           albumArt.data().size());
        covpic = cover.scaled(
                    50,
                    50,
                    Qt::IgnoreAspectRatio,
                    Qt::SmoothTransformation);
        if(!covpic.isNull())
        {
            qDebug()<<"读取M4A封面信息成功";
        }else
        {
            covpic.load(":/image/image/playIcon.png");
            qDebug()<<"读取音乐封面信息失败";
        }
    }
    else if(fileExtension == "mp3")
    {
        TagLib::MPEG::File *mpegFile = new TagLib::MPEG::File(
                    QFile::encodeName(filePath).constData());
        if(false==mpegFile->isOpen())
            return;
        else
        {
            sname=QString(mpegFile->tag()->title().toCString(true));
            singer=QString(mpegFile->tag()->artist().toCString(true));
            album=QString(mpegFile->tag()->album().toCString(true));
            auto tag = mpegFile->ID3v2Tag(false);
            auto list = tag->frameListMap()["APIC"];
            if(!list.isEmpty()) {
                auto frame = list.front();
                auto pic = reinterpret_cast<TagLib::ID3v2::AttachedPictureFrame *>(frame);
                if(pic && !pic->picture().isNull())
                {
                    QImage cover;
                    if(cover.loadFromData(QByteArray::fromRawData(pic->picture().data(), pic->picture().size()))) {
                        covpic = cover.scaled(
                                    50,
                                    50,
                                    Qt::IgnoreAspectRatio,
                                    Qt::SmoothTransformation);
                        qDebug()<<"读取MP3封面信息成功";
                    }
                }
            }
            else
            {
                covpic.load(":/image/image/playIcon.png");
                qDebug()<<"读取音乐封面信息失败";
            }
        }
    }
    singerlist.append(singer);
    snamelist.append(sname);
    albumlist.append(album);
    covPiclist.append(covpic);
    int covCount=covPiclist.length();
    QString covpicpath=QDir::tempPath()+QString("/%1.png").arg(covCount);
    covpic.save(covpicpath);
    QUrl covpicUrl=QUrl::fromLocalFile(covpicpath);
    qDebug()<<"歌名为"<<sname;
    qDebug()<<"歌手为"<<singer;
    qDebug()<<"专辑为"<<album;
    qDebug()<<"URL为"<<covpicUrl;
    emit setSongInfo(singer,sname,album,covpicUrl);
    return;
}