save Qimage in a file

[OverTheOCean]

hi,
l'm downloading a file ( image.png) from an instrument using GPIB...l get the file as ASCII, save it in a file. But then when l try to load in Qimage, l get a error message from Libpng lirary. but l can open the saved image on the disk with Infrview and other picture viewer.

QFile file("out.png");
  if (!file.open(QIODevice::WriteOnly))
        return 0;
  QTextStream out(&file);
  out << image;
  file.close();
  myImage->load("out.png");

QFile file("out.png");
  if (!file.open(QIODevice::WriteOnly))
        return 0;
  QTextStream out(&file);
  out << image;
  file.close();
  myImage->load("out.png");

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should l convert the Qstring image to an other format before to save in the file ?

regards,

Michael