my $IMG = $this->{DB}->SelectImage;
Wx::FileSystem::AddHandler( Wx::MemoryFSHandler->new );
Wx::InitAllImageHandlers();
Wx::MemoryFSHandler::AddBinaryFile( 'photo.jpg', $IMG);

my $fs = Wx::FileSystem->new( );
my $File = $fs->OpenFile( 'memory:photo.jpg' );
# Funktioniert alles
print $File->GetMimeType; # sogar den Mime-Typ erkannt: image/jpeg

my $imgm = Wx::Image->new('memory:photo.jpg', wxBITMAP_TYPE_JPEG);