แก้ไข PDF ใน C++

auto pres = System::MakeObject<Presentation>();

pres->get_Slides()->RemoveAt(0);
pres->get_Slides()->AddFromPdf(u"document.pdf");

auto slide = pres->get_Slides()->idx_get(0);
auto shape = slide->get_Shapes()->AddAutoShape(ShapeType::Rectangle, 10.0f, 10.0f, 100.0f, 50.0f);
shape->get_TextFrame()->set_Text(u"New text");

pres->Save(u"document.pdf", SaveFormat::Pdf);