public PdfData(IntPtr document, IntPtr form, int pageIndex)
{
_form = form;
Page = PdfiumLibrary.FPDF_LoadPage(document, pageIndex);
TextPage = PdfiumLibrary.FPDFText_LoadPage(Page);
PdfiumLibrary.FORM_OnAfterLoadPage(Page, _form);
PdfiumLibrary.FORM_DoPageAAction(Page, _form, FPDFPAGE_AACTION.OPEN);
Width = PdfiumLibrary.FPDF_GetPageWidth(Page);
Height = PdfiumLibrary.FPDF_GetPageHeight(Page);
}