รวมรูปภาพเป็น BMP ใน C++

auto pres = System::MakeObject<Presentation>();
        
auto image1 = pres->get_Images()->AddImage(File::ReadAllBytes(u"image1.png"));
pres->get_Slides()->idx_get(0)->get_Shapes()->AddPictureFrame(ShapeType::Rectangle, 0.0f, 0.0f, 100.0f, 100.0f, image1);
auto image2 = pres->get_Images()->AddImage(File::ReadAllBytes(u"image2.png"));
pres->get_Slides()->idx_get(0)->get_Shapes()->AddPictureFrame(ShapeType::Rectangle, 0.0f, 200.0f, 100.0f, 100.0f, image2);

for (int32_t index = 0; index < pres->get_Slides()->get_Count(); index++)
{
    auto slide = pres->get_Slides()->idx_get(index);
    auto fileName = String::Format(u"slide_{0}.bmp", index);
    slide->GetThumbnail()->Save(fileName, ImageFormat::get_Bmp());
}