qpng_read_end(png, pnginfo);
qpng_destroy_read_struct(&png, &pnginfo, 0);
image_width = (int)my_png.Width;
image_height = (int)my_png.Height;
qpng_read_end(png, pnginfo);
qpng_destroy_read_struct(&png, &pnginfo, 0);
image_width = (int)my_png.Width;
image_height = (int)my_png.Height;