Go 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. Go

    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.NewPdf()
    success = pdf.LoadFile("qa_data/pdf/long_report.pdf")
    if success == false {
        fmt.Println(pdf.LastErrorText())
        pdf.DisposePdf()
        return
    }

    fmt.Println("Number of pages: ", pdf.NumPages())

    //  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.NewJsonObject()
    sbText := chilkat.NewStringBuilder()
    jsonOut := chilkat.NewJsonObject()

    success = pdf.ExtractTextSb("text",json,sbText,jsonOut)
    if success == false {
        fmt.Println(pdf.LastErrorText())
        pdf.DisposePdf()
        json.DisposeJsonObject()
        sbText.DisposeStringBuilder()
        jsonOut.DisposeJsonObject()
        return
    }

    fmt.Println("Extracted ", sbText.Length(), " characters.")

    //  Save the text to a file.
    success = sbText.WriteFile("qa_output/long_report.txt","utf-8",false)
    if success == false {
        fmt.Println(sbText.LastErrorText())
        pdf.DisposePdf()
        json.DisposeJsonObject()
        sbText.DisposeStringBuilder()
        jsonOut.DisposeJsonObject()
        return
    }

    //  The JSON output does not contain the text, but it still has the quality report.
    fmt.Println("Quality: ", *jsonOut.StringOf("quality.rating"))
    fmt.Println("Pages with no text (need OCR): [", *jsonOut.StringOf("quality.pagesNeedingOcr"), "]")

    //  Sample output:

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

    pdf.DisposePdf()
    json.DisposeJsonObject()
    sbText.DisposeStringBuilder()
    jsonOut.DisposeJsonObject()