Can not modify a document by creating a new form XObject and using it in one of the pages about pdf-writer HOT 3 CLOSED

PDFWriter pdfWriter;
if (pdfWriter.ModifyPDF("a.pdf", ePDFVersion13, "") != PDFHummus::eSuccess) {
  std::cerr << "failed to modify PDF\n";
  return -1;
}


PDFModifiedPage pdfModifiedPage(&pdfWriter, nPageIndex);


const cv::Mat img = cv::imread("a.jpg");
if (!img.empty()) {

  std::vector<unsigned char> buf;
  if (cv::imencode(".jpg", img, buf)) {

    InputByteArrayStream* inBuf = new InputByteArrayStream(buf.data(), buf.size());
    PDFFormXObject* pdfFormXObject = pdfWriter.CreateFormXObjectFromJPGStream(inBuf);
    if (pdfFormXObject != nullptr) {

      AbstractContentContext* pdfPageCtx = pdfModifiedPage.StartContentContext();
      if (pdfPageCtx != nullptr) {

        const std::string& pdfFormXObjectName =
          pdfModifiedPage.GetCurrentResourcesDictionary()->AddFormXObjectMapping(pdfFormXObject->GetObjectID());

        pdfPageCtx->q();
        pdfPageCtx->cm(1, 0, 0, 1, 0, 0);
        pdfPageCtx->Do(pdfFormXObjectName);
        pdfPageCtx->Q();

        pdfModifiedPage.EndContentContext();
      }
      else {
        std::cerr << "failed to create content context for page\n";
      }

      delete pdfFormXObject;
    }
    else {
      std::cerr << "failed to create form XObject from stream\n";
    }
  }
  else {
    std::cerr << "failed to encode image\n";
  }
}
else {
  std::cerr << "failed to read image from file\n";
}


pdfModifiedPage.WritePage();
pdfWriter.EndPDF();