แปลง CGM เป็น BMP ผ่านทาง C++

void Convert_PDF_To_Images::ConvertPDFusingImageDevice()
{
    std::clog << __func__ << ": Start" << std::endl;

    // String for path name
    String _dataDir("C:\\Samples\\Conversion\\");

    // String for input file name
    String infilename("sample.cgm");
    
    // Open document
    auto document = MakeObject<Document>();

    // Add empty page in empty document
    auto page = document->get_Pages()->Add();
    auto image = MakeObject<Aspose::Pdf::Image>();
    image->set_File(_dataDir + infilename);

    // Add image on a page
    page->get_Paragraphs()->Add(image);

    // Create Resolution object            
    auto resolution = MakeObject<Aspose::Pdf::Devices::Resolution>(300); //300 dpi

    System::SmartPtr<Aspose::Pdf::Devices::ImageDevice>
    bmpDevice = MakeObject<Aspose::Pdf::Devices::BmpDevice>(resolution);
    
    auto document = MakeObject<Document>(_dataDir + u"ConvertAllPagesToBmp.pdf");

    ConvertPDFtoImage(bmpDevice, u"bmp", document);

    std::clog << __func__ << ": Finish" << std::endl;

}

void Convert_PDF_To_Images::ConvertPDFtoImage(
 System::SmartPtr<Aspose::Pdf::Devices::ImageDevice> imageDevice,
 String ext, System::SmartPtr<Document> document)
{
    // String for path name
    String _dataDir("C:\\Samples\\Conversion\\");

    for (int pageCount = 1; pageCount <= document->get_Pages()->get_Count(); pageCount++)
    {
    String outfilename = String::Format(u"{0}PageToBmp{1}_out.{2}",
    _dataDir, pageCount, ext);

    auto imageStream = System::IO::File::OpenWrite(outfilename);

    // Create Resolution object
    auto resolution = MakeObject<Aspose::Pdf::Devices::Resolution>(300);

    // Convert a particular page and save the image to stream
    imageDevice->Process(document->get_Pages()->idx_get(pageCount), imageStream);

    // Close stream
    imageStream->Close();
    }
}