Visual FoxPro 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. Visual FoxPro

LOCAL lnSuccess
LOCAL loPdf
LOCAL loJson
LOCAL loSbText
LOCAL loJsonOut

lnSuccess = 0

*  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

loPdf = CreateObject('Chilkat.Pdf')
lnSuccess = loPdf.LoadFile("qa_data/pdf/long_report.pdf")
IF (lnSuccess = 0) THEN
    ? loPdf.LastErrorText
    RELEASE loPdf
    CANCEL
ENDIF

? "Number of pages: " + STR(loPdf.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.
loJson = CreateObject('Chilkat.JsonObject')
loSbText = CreateObject('Chilkat.StringBuilder')
loJsonOut = CreateObject('Chilkat.JsonObject')

lnSuccess = loPdf.ExtractTextSb("text",loJson,loSbText,loJsonOut)
IF (lnSuccess = 0) THEN
    ? loPdf.LastErrorText
    RELEASE loPdf
    RELEASE loJson
    RELEASE loSbText
    RELEASE loJsonOut
    CANCEL
ENDIF

? "Extracted " + STR(loSbText.Length) + " characters."

*  Save the text to a file.
lnSuccess = loSbText.WriteFile("qa_output/long_report.txt","utf-8",0)
IF (lnSuccess = 0) THEN
    ? loSbText.LastErrorText
    RELEASE loPdf
    RELEASE loJson
    RELEASE loSbText
    RELEASE loJsonOut
    CANCEL
ENDIF

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

*  Sample output:

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

RELEASE loPdf
RELEASE loJson
RELEASE loSbText
RELEASE loJsonOut