QtConcurrent scaling image

Hneis

Hello everyone. Help make out what the problem is.
He took an example of Image Scaling working:
@QImage scale (const QString & imageFileName)
{
QImage image (imageFileName);
return image.scaled (QSize (imageSize, imageSize), Qt :: IgnoreAspectRatio, Qt :: SmoothTransformation);
}

void Images :: open ()
{
...
     QStringList files = QFileDialog :: getOpenFileNames (this, tr ("Select Images"),
                             QStandardPaths :: writableLocation (QStandardPaths :: PicturesLocation),
                             "*. jpg *. png");

...
imageScaling-> setFuture (QtConcurrent :: mapped (files, scale));
...
}@

But if you do so. falls with error

@QImage scale (const QString & imageFileName)
{
QImage image (imageFileName);
return image.scaled (QSize (imageSize, imageSize), Qt :: IgnoreAspectRatio, Qt :: SmoothTransformation);
}

void Images :: open ()
{
...
     QStringList files;
     files.append (QString ("path to file"));
     files.append (QString ("path to file2"));
     files.append (QString ("etc"));

...
imageScaling-> setFuture (QtConcurrent :: mapped (files, scale));
...
}@

if you add in QStringList path to a single file, it works too

mcosta

bq. But if you do so. falls with error

What kind of error?

mostmore

can't figure out what the problem is, can you give us some more details. i have "image scaling sample codes":http://www.rasteredge.com/how-to/csharp-imaging/scale-image/ found for you on the google, you may take a lookt, hope it is helpful for you.