confused about QFileDialog in debug and release mode

[furskytl]

void QQTScene::dropEvent(QGraphicsSceneDragDropEvent *event)
{
    const QMimeData *mimeData = event->mimeData();
    QString text = mimeData->text();
 
    QGraphicsItem *item;
 
    if(text == tr("文本"))
    {
        item = new QQTText(text);
        connect(qgraphicsitem_cast<QQTText *>(item), SIGNAL(selectedChange(QGraphicsItem*)), this, SIGNAL(itemSelected(QGraphicsItem*)));
    }
    else if(text == tr("图像"))
    {
        QString fileName;
        fileName = QFileDialog::getOpenFileName(0, tr("打开图片"), "",
                                                tr("Image Files (*.png *.jpg *.bmp)"));
 
        if(!fileName.isEmpty()){
            QPixmap pixmap(fileName);
            item = new QQTImage(pixmap);
            QRectF r = item->boundingRect();
            if(r.width() > 800)
            {
                item->scale(0.5, 0.5);
            }
            //connect(qgraphicsitem_cast<QQTImage *>(item), SIGNAL(resize()), this, SLOT(resize()));
            /* 修改当前工作目录，使下次打开图片的时候可以减少重新选择目录的操作 */
            QDir::setCurrent(QFileInfo(fileName).absolutePath());
        }
        else
        {
            event->setDropAction(Qt::IgnoreAction);
            return;
        }
    }
    item->setPos(event->scenePos());
    addItem(item);
 
    event->setDropAction(Qt::CopyAction);
    event->accept();
}

void QQTScene::dropEvent(QGraphicsSceneDragDropEvent *event)
{
    const QMimeData *mimeData = event->mimeData();
    QString text = mimeData->text();

    QGraphicsItem *item;

    if(text == tr("文本"))
    {
        item = new QQTText(text);
        connect(qgraphicsitem_cast<QQTText *>(item), SIGNAL(selectedChange(QGraphicsItem*)), this, SIGNAL(itemSelected(QGraphicsItem*)));
    }
    else if(text == tr("图像"))
    {
        QString fileName;
        fileName = QFileDialog::getOpenFileName(0, tr("打开图片"), "",
                                                tr("Image Files (*.png *.jpg *.bmp)"));

        if(!fileName.isEmpty()){
            QPixmap pixmap(fileName);
            item = new QQTImage(pixmap);
            QRectF r = item->boundingRect();
            if(r.width() > 800)
            {
                item->scale(0.5, 0.5);
            }
            //connect(qgraphicsitem_cast<QQTImage *>(item), SIGNAL(resize()), this, SLOT(resize()));
            /* 修改当前工作目录，使下次打开图片的时候可以减少重新选择目录的操作 */
            QDir::setCurrent(QFileInfo(fileName).absolutePath());
        }
        else
        {
            event->setDropAction(Qt::IgnoreAction);
            return;
        }
    }
    item->setPos(event->scenePos());
    addItem(item);

    event->setDropAction(Qt::CopyAction);
    event->accept();
}

To copy to clipboard, switch view to plain text mode 

It crashes at

fileName = QFileDialog::getOpenFileName(0, tr("打开图片"), "",
                                                tr("Image Files (*.png *.jpg *.bmp)"));

fileName = QFileDialog::getOpenFileName(0, tr("打开图片"), "",
                                                tr("Image Files (*.png *.jpg *.bmp)"));

To copy to clipboard, switch view to plain text mode 

I debug it to find that it crashes in system function

void qt_blend_argb32_on_argb32_sse2(uchar *destPixels, int dbpl,
                                    const uchar *srcPixels, int sbpl,
                                    int w, int h,
                                    int const_alpha)

void qt_blend_argb32_on_argb32_sse2(uchar *destPixels, int dbpl,
                                    const uchar *srcPixels, int sbpl,
                                    int w, int h,
                                    int const_alpha)

To copy to clipboard, switch view to plain text mode 

at line

BLEND_SOURCE_OVER_ARGB32_SSE2(dst, src, w, nullVector, half, one, colorMask, alphaMask);

BLEND_SOURCE_OVER_ARGB32_SSE2(dst, src, w, nullVector, half, one, colorMask, alphaMask);

To copy to clipboard, switch view to plain text mode