Go Requires Chilkat v11.7.0+

Extract Text from a PDF that Forbids Copying

See more PDF Text Extraction Examples

Demonstrates a PDF that opens without a password but whose permissions do not allow copying text. The "text", "markdown", "search" and "tables" operations fail with that reason; "assess" always works. Loading the PDF with the OwnerPassword property set grants owner rights, and extraction works. 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 (owner password: owner-secret; copying not permitted) is available at no_copy_permission.pdf

    pdf := chilkat.NewPdf()
    json := chilkat.NewJsonObject()
    jsonOut := chilkat.NewJsonObject()

    //  The PDF opens without a password.
    success = pdf.LoadFile("qa_data/pdf/no_copy_permission.pdf")
    if success == false {
        fmt.Println(pdf.LastErrorText())
        pdf.DisposePdf()
        json.DisposeJsonObject()
        jsonOut.DisposeJsonObject()
        return
    }

    //  Extracting text is refused, because the PDF's permissions do not allow copying.
    success = pdf.ExtractText("text",json,jsonOut)
    if success == false {
        fmt.Println("Extraction refused: ", pdf.LastErrorText())
    }

    //  "assess" reports only counts and ratings, never text, so it is always allowed.
    success = pdf.ExtractText("assess",json,jsonOut)
    if success == false {
        fmt.Println(pdf.LastErrorText())
        pdf.DisposePdf()
        json.DisposeJsonObject()
        jsonOut.DisposeJsonObject()
        return
    }

    fmt.Println("rating: ", *jsonOut.StringOf("quality.rating"))

    //  Load with the owner password to get owner rights, which include copying.
    pdf.SetOwnerPassword("owner-secret")
    success = pdf.LoadFile("qa_data/pdf/no_copy_permission.pdf")
    if success == false {
        fmt.Println(pdf.LastErrorText())
        pdf.DisposePdf()
        json.DisposeJsonObject()
        jsonOut.DisposeJsonObject()
        return
    }

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

    fmt.Println(*jsonOut.StringOf("text"))

    //  Sample output:

    //  Extraction refused: ChilkatLog:
    //    ExtractText:
    //      ...
    //        The PDF's permissions do not allow copying or extracting text (load it with the owner password to extract).
    //      ...
    //  rating: good
    //  Visitor Leaflet
    //  
    //  Welcome to the harbor lighthouse. The tower is open on weekends from July to September.
    //  
    //  Please keep to the marked paths and do not climb on the breakwater.
    //  
    //  The lantern room is closed in high winds.

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