public static Dictionary <string, object> GetAnnotationsFromPDF(string filepath, int page = 1)
{
if (!System.IO.File.Exists(filepath))
{
throw new Exception(Properties.Resources.FileNotFoundError);
}
List <Content.Annotation> elements = new List <Content.Annotation>();
Rectangle pagesize = null;
// Open a new memory stream
using (var ms = new System.IO.MemoryStream())
{
// Create a new pdf reader and get the first page
PdfReader myPdfReader = new PdfReader(filepath);
if (page < 1 || page > myPdfReader.NumberOfPages)
{
throw new Exception(Properties.Resources.WrongPageNumber);
}
PdfDictionary pageDict = myPdfReader.GetPageN(page);
PdfArray annotArray = pageDict.GetAsArray(PdfName.ANNOTS);
pagesize = myPdfReader.GetPageSizeWithRotation(page).ToDSRectangle();
if (annotArray == null)
{
throw new Exception(Properties.Resources.NoAnnotations);
}
// Walk through the annotation element array
for (int i = 0; i < annotArray.Size; i++)
{
// Get the elements type and subject to filter by
PdfDictionary annotationElement = annotArray.GetAsDict(i);
PdfName subtype = annotationElement.GetAsName(PdfName.SUBTYPE);
if (subtype != null)
{
if (subtype == PdfName.LINE)
{
elements.Add(annotationElement.ToLine());
}
else if (subtype == PdfName.POLYGON)
{
elements.Add(annotationElement.ToPolyCurve(true));
}
else if (subtype == PdfName.POLYLINE)
{
elements.Add(annotationElement.ToPolyCurve(false));
}
else if (subtype == PdfName.INK)
{
elements.Add(annotationElement.InkToPolyCurve());
}
else if (subtype == PdfName.SQUARE)
{
elements.Add(annotationElement.ToRectangle());
}
else if (subtype == PdfName.FREETEXT)
{
elements.Add(annotationElement.ToRectangle());
}
else if (subtype == PdfName.CIRCLE)
{
elements.Add(annotationElement.ToCircle());
}
}
}
string content = PdfTextExtractor.GetTextFromPage(myPdfReader, page, new SimpleTextExtractionStrategy());
}
return(new Dictionary <string, object>()
{
{ "Annotations", elements },
{ "Rectangle", pagesize }
});
}