QImage constructor

[Lele]

Hello,
I'm just trying to create a Qimage passing a buffer or ARGB.
So I tried this:

uchar* testB = new uchar[384*288*4];
QImage image = QImage((uchar*) testB, 384, 288, QImage::Format_ARGB32);

uchar* testB = new uchar[384*288*4];
QImage image = QImage((uchar*) testB, 384, 288, QImage::Format_ARGB32);

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On the second line I get an error and it occurs when in the QImage constructor
I access d->depth (set on 0 at the first line):

QImage::QImage(uchar* data, int width, int height, Format format)
    : QPaintDevice()
{
    d = 0;
    const int depth = depthForFormat(format);
    const int bytes_per_line = ((width * d->depth + 31)/32) * 4;

QImage::QImage(uchar* data, int width, int height, Format format)
    : QPaintDevice()
{
    d = 0;
    const int depth = depthForFormat(format);
    const int bytes_per_line = ((width * d->depth + 31)/32) * 4;

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Am I doing something wrong or it's a QT bug? (I'm using 4.2.1)

thanks

bye