why "Unable to read image data"

[zarelaky]

I use the code below loading png image frequent on ce5 device , at the begin every thing ok, a hour later, i get the error message "unable to read image data", somebody can help me ?

QImage im;
    QString img = m_imgs.last();
    QFileInfo finfo(img);
    if (!finfo.exists() || !finfo.isFile()) {
        img = QDir::currentPath() + QDir::separator() + "skins/no_pic.png";
    }
 
    QFile f(img);
    if (f.open(QFile::ReadOnly)) {
        QByteArray ba = f.readAll();
        f.close();
        if (ba.size() != finfo.size()) {
            qDebug() << "read file error ! size:" << finfo.size() << " read: " << ba.size() << "\r\n" ;
        }
        int retryTimes(1);
        do {
            QBuffer b;
            b.setBuffer(&ba);
            b.open(QIODevice::ReadOnly);
            QImageReader ir(&b);
            bool bR = ir.read(&im);
            if (!bR || im.isNull()) {
                qDebug() <<  ir.errorString() << "\r\n";
            } else {
                QPainter p(m_px);
                p.drawImage(0,0,im);                    
                if (m_px->isNull()) {
                    qDebug() << QString("convert to pixmap failed ! %1").arg(img) << "\r\n";
                }
                else {
                    m_imgs.clear();
                    break;
                }
            }
            QPixmapCache::clear();
        } while (--retryTimes);
 
    } else {
        qDebug() << "open file failed " << f.errorString() << "\r\n";
    }

QImage im;
    QString img = m_imgs.last();
    QFileInfo finfo(img);
    if (!finfo.exists() || !finfo.isFile()) {
        img = QDir::currentPath() + QDir::separator() + "skins/no_pic.png";
    }
 
    QFile f(img);
    if (f.open(QFile::ReadOnly)) {
        QByteArray ba = f.readAll();
        f.close();
        if (ba.size() != finfo.size()) {
            qDebug() << "read file error ! size:" << finfo.size() << " read: " << ba.size() << "\r\n" ;
        }
        int retryTimes(1);
        do {
            QBuffer b;
            b.setBuffer(&ba);
            b.open(QIODevice::ReadOnly);
            QImageReader ir(&b);
            bool bR = ir.read(&im);
            if (!bR || im.isNull()) {
                qDebug() <<  ir.errorString() << "\r\n";
            } else {
                QPainter p(m_px);
                p.drawImage(0,0,im);                    
                if (m_px->isNull()) {
                    qDebug() << QString("convert to pixmap failed ! %1").arg(img) << "\r\n";
                }
                else {
                    m_imgs.clear();
                    break;
                }
            }
            QPixmapCache::clear();
        } while (--retryTimes);

    } else {
        qDebug() << "open file failed " << f.errorString() << "\r\n";
    }

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[zarelaky]

more:
I run the program on the device, 6 hours later, It crashed, the debug windows show me the memory not enough, null image return.