Ruby Requires Chilkat v11.7.0+

Extract PDF Text to a StringBuilder and Save to a File

See more PDF Text Extraction Examples

Demonstrates ExtractTextSb, which writes the extracted text to a StringBuilder instead of returning it as a JSON string. Use it for large documents. The JSON output still receives the quality report. Ruby

require 'chilkat'

success = false

#  This example requires the Chilkat API to have been previously unlocked.
#  See Global Unlock Sample for sample code.

#  The PDF used in this example is available at long_report.pdf

pdf = Chilkat::CkPdf.new()
success = pdf.LoadFile("qa_data/pdf/long_report.pdf")
if (success == false)
    print pdf.lastErrorText() + "\n";
    exit
end

print "Number of pages: " + pdf.get_NumPages().to_s() + "\n";

#  ExtractTextSb takes the same operation and options as ExtractText, but the text
#  goes to a StringBuilder.  This avoids building a very large JSON string for
#  documents with many pages.
json = Chilkat::CkJsonObject.new()
sbText = Chilkat::CkStringBuilder.new()
jsonOut = Chilkat::CkJsonObject.new()

success = pdf.ExtractTextSb("text",json,sbText,jsonOut)
if (success == false)
    print pdf.lastErrorText() + "\n";
    exit
end

print "Extracted " + sbText.get_Length().to_s() + " characters." + "\n";

#  Save the text to a file.
success = sbText.WriteFile("qa_output/long_report.txt","utf-8",false)
if (success == false)
    print sbText.lastErrorText() + "\n";
    exit
end

#  The JSON output does not contain the text, but it still has the quality report.
print "Quality: " + jsonOut.stringOf("quality.rating") + "\n";
print "Pages with no text (need OCR): [" + jsonOut.stringOf("quality.pagesNeedingOcr") + "]" + "\n";

#  Sample output:

#  Number of pages: 3
#  Extracted 4522 characters.
#  Quality: good
#  Pages with no text (need OCR): []