load pixbuf from data (avoids PixbufLoader errors)

    async Gdk.Pixbuf pix_from_data (uint8[] data){
        FileIOStream stream;
        var file = File.new_tmp ("totoXXXXXX", out stream);
        stream.output_stream.write (data);
        stream.seek (0,SeekType.SET);
        Gdk.Pixbuf? pix = null;
        if(data.length > 0)
            pix = yield new Gdk.Pixbuf.from_stream_async (stream.input_stream, null);
        else
            pix = new Gtk.Image.from_icon_name ("image-missing",Gtk.IconSize.MENU).pixbuf;
        return pix;
    }

/***/

Gtk.Image imgTag = ...
uint8[] buffer = ...
/***/

pix_from_data.begin (buffer,(obj,res)=>{
    try {
        imgTag.pixbuf = pix_from_data.end(res);
    }catch(GLib.Error e){
        print("%s\n",e.message);
    }
});