DataFlex 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. DataFlex

Use ChilkatAx-win32.pkg

Procedure Test
    Boolean iSuccess
    Handle hoPdf
    Variant vJson
    Handle hoJson
    Variant vSbText
    Handle hoSbText
    Variant vJsonOut
    Handle hoJsonOut
    String sTemp1
    Integer iTemp1

    Move False To iSuccess

    //  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

    Get Create (RefClass(cComChilkatPdf)) To hoPdf
    If (Not(IsComObjectCreated(hoPdf))) Begin
        Send CreateComObject of hoPdf
    End
    Get ComLoadFile Of hoPdf "qa_data/pdf/long_report.pdf" To iSuccess
    If (iSuccess = False) Begin
        Get ComLastErrorText Of hoPdf To sTemp1
        Showln sTemp1
        Procedure_Return
    End

    Get ComNumPages Of hoPdf To iTemp1
    Showln "Number of pages: " iTemp1

    //  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.
    Get Create (RefClass(cComChilkatJsonObject)) To hoJson
    If (Not(IsComObjectCreated(hoJson))) Begin
        Send CreateComObject of hoJson
    End
    Get Create (RefClass(cComChilkatStringBuilder)) To hoSbText
    If (Not(IsComObjectCreated(hoSbText))) Begin
        Send CreateComObject of hoSbText
    End
    Get Create (RefClass(cComChilkatJsonObject)) To hoJsonOut
    If (Not(IsComObjectCreated(hoJsonOut))) Begin
        Send CreateComObject of hoJsonOut
    End

    Get pvComObject of hoJson to vJson
    Get pvComObject of hoSbText to vSbText
    Get pvComObject of hoJsonOut to vJsonOut
    Get ComExtractTextSb Of hoPdf "text" vJson vSbText vJsonOut To iSuccess
    If (iSuccess = False) Begin
        Get ComLastErrorText Of hoPdf To sTemp1
        Showln sTemp1
        Procedure_Return
    End

    Get ComLength Of hoSbText To iTemp1
    Showln "Extracted " iTemp1 " characters."

    //  Save the text to a file.
    Get ComWriteFile Of hoSbText "qa_output/long_report.txt" "utf-8" False To iSuccess
    If (iSuccess = False) Begin
        Get ComLastErrorText Of hoSbText To sTemp1
        Showln sTemp1
        Procedure_Return
    End

    //  The JSON output does not contain the text, but it still has the quality report.
    Get ComStringOf Of hoJsonOut "quality.rating" To sTemp1
    Showln "Quality: " sTemp1
    Get ComStringOf Of hoJsonOut "quality.pagesNeedingOcr" To sTemp1
    Showln "Pages with no text (need OCR): [" sTemp1 "]"

    //  Sample output:

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


End_Procedure