Category: WPF

16 Dec 2016 15:23

Joined:	16/12/2016
Level:	Bronze
Points:	5

Points:	5

Text search and extraction in pdf file

I am working for text search and extraction from pdf using third party dll itextsharp.
I am getting the text on searching but not only that text, the whole text of that page.
I thought to use phrases or chunks so that I can get pre-and post of that text only along with it instead of whole page text. Can anyone suggest me code for phrases or anything else which I can use for it. Thanks!

My code is:

string searchText = null;
string filename = System.AppDomain.CurrentDomain.BaseDirectory;
filename = @"C:\test.pdf";
searchText = textBox.Text.ToString();

List<int> pages = new List<int>();
if (File.Exists(filename))
{
PdfReader pdfReader = new PdfReader(filename);
List<Phrase> PhraseList = new List<Phrase>();

for (int page = 1; page <= pdfReader.NumberOfPages; page++)
{

ITextExtractionStrategy strategy = SimpleTextExtractionStrategy();
string currentPageText = PdfTextExtractor.GetTextFromPage(pdfReader, page, strategy)

if (currentPageText.Contains(searchText))
{
pages.Add(page);
textBox1.AppendText(PdfTextExtractor.GetTextFromPage(pdfReader, page));
textBox1.Text += pages.ToString();
}
}
pdfReader.Close();
}

#768556

20 Dec 2016 07:38

Joined:	15/02/2016
Level:	Bronze
Points:	75

Points:	2

Hello,

There are many 3rd party libraries can achieve this. Check this one:
https://www.nuget.org/packages/FreeSpire.PDF/

#768566

21 Dec 2016 14:30

Joined:	13/06/2007
Level:	Gold
Points:	21327

Points:	4

Once I have tried with ItextSharp and find a text in PDF file, you can check below code. see if its works for you


 public string ReadPdfFile(string fileName)
        {
            StringBuilder text = new StringBuilder();

            if (File.Exists(fileName))
            {
                PdfReader pdfReader = new PdfReader(fileName);

                for (int page = 1; page <= pdfReader.NumberOfPages; page++)
                {



                    ITextExtractionStrategy strategy = new SimpleTextExtractionStrategy();
                    string currentText = PdfTextExtractor.GetTextFromPage(pdfReader, page, strategy);

                    currentText = Encoding.UTF8.GetString(ASCIIEncoding.Convert(Encoding.Default, Encoding.UTF8, Encoding.Default.GetBytes(currentText)));
                    text.Append(currentText);
                }
                pdfReader.Close();
            }
            return text.ToString();
        }

Thanks
Koolprasd2003
Editor, DotNetSpider MVM
Microsoft MVP 2014 [ASP.NET/IIS]

Text search and extraction in pdf file

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