How-to extract text from a pdf doc within a specific rectangular region? [closed]

Question

I have to extract text from a pdf doc within a specific rectangular region. The work-flow is as following. First of all pdf is converted to an jpg image. Then user draws selection rectangle on top of the picture. Then I somehow need to extract all text from pdf doc within that selection region. Any suggestions what freeware pdf libs accessible from C# to use?

Answer 1

this code will perfectly extract pdf data on the basis of rectangular coordinates using itextsharp

    List<string> linestringlist = new List<string>();
    PdfReader reader = new PdfReader(pdfFilename);
    iTextSharp.text.Rectangle rect = new iTextSharp.text.Rectangle(coordinate1, coordinate2, coordinate3, coordinate4);
    RenderFilter[] renderFilter = new RenderFilter[1];
    renderFilter[0] = new RegionTextRenderFilter(rect);
    ITextExtractionStrategy textExtractionStrategy = new FilteredTextRenderListener(new LocationTextExtractionStrategy(), renderFilter);
    string text = PdfTextExtractor.GetTextFromPage(reader, 1, textExtractionStrategy);