Extract Text from PDF File

In this article, we’ll look into the details of extracting text from a PDF file. All of these extraction features are provided at one place, in PdfExtractor class. We’ll see how to use these features in our code.

PdfExtractor class provides three types of extraction capabilities. These three categories are Text, Images and Attachments. In order to perform extraction under each of these three categories PdfExtractor provide various methods which work together to give you the final output.

For example, in order to extract text you can use three methods i.e. ExtractText, GetText, HasNextPageText and GetNextPageText. Now, in order to start extracting text, first of all, you need to call ExtractText method; this will extract the text from the PDF file and will store it into memory. After that, GetText method will take this extracted text and save on to the disk at specified location in a file. HasNextPageText helps you loop through each page and check whether the next page has any text or not. If it contains some text then GetNextPageText will help you save the text of an individual page into the file.

public static void ExtractText()
{
    bool WholeText = true;
    // Create an object of the PdfExtractor class
    PdfExtractor pdfExtractor = new PdfExtractor();

    // Bind the input PDF
    pdfExtractor.BindPdf(_dataDir + "sample.pdf");

    // ExtractText
    pdfExtractor.ExtractText();

    if (!WholeText)
    {
        pdfExtractor.GetText(_dataDir + "sample.txt");
    }
    else
    {
        // Extract the text into separate files
        int pageNumber = 1;
        while (pdfExtractor.HasNextPageText())
        {
            pdfExtractor.GetNextPageText($"{_dataDir}\\sample{pageNumber:D3}.txt");
            pageNumber++;
        }
    }
}

To Extract the Text Extraction Mode use the following code:

public static void ExtractTextExtractonMode()
{
    bool WholeText = true;
    // Create an object of the PdfExtractor class
    PdfExtractor pdfExtractor = new PdfExtractor();

    // Bind the input PDF
    pdfExtractor.BindPdf(_dataDir + "sample.pdf");

    // ExtractText
    // pdfExtractor.ExtractTextMode = 0; //pure mode
    pdfExtractor.ExtractTextMode = 1; //raw mode
    pdfExtractor.ExtractText();

    if (!WholeText)
    {
        pdfExtractor.GetText(_dataDir + "sample.txt");
    }
    else
    {
        // Extract the text into separate files
        int pageNumber = 1;
        while (pdfExtractor.HasNextPageText())
        {
            pdfExtractor.GetNextPageText($"{_dataDir}\\sample{pageNumber:D3}.txt");
            pageNumber++;
        }
    }
}