Go Requires Chilkat v11.7.0+

Replace PDF Text on Selected Pages Only

See more PDF Text Replacement Examples

Demonstrates the "pages" option, which limits the search for placeholders and labels to the given pages: "all" (the default), "first", "last", "odd", "even", or a list such as "1,3,5-9". The two-page order confirmation carries the same "Status:" label on both pages; the status is changed on page 2 only, then on both pages. 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 order_confirmation.pdf

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

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

    //  Both pages have "Status:   Pending".  With pages "2", only page 2 is searched.
    json.UpdateString("pages","2")
    json.UpdateString("labels[0].label","Status:")
    json.UpdateString("labels[0].value","Shipped")
    success = pdf.TextReplace("check",json,jsonOut)
    if success == false {
        fmt.Println(pdf.LastErrorText())
        pdf.DisposePdf()
        json.DisposeJsonObject()
        jsonOut.DisposeJsonObject()
        return
    }

    fmt.Println("pages 2: found on page(s) ", *jsonOut.StringOf("replacements[0].pages"))

    //  With every page searched, the default occurrence ("first") still replaces one -- the first in reading order.
    json.UpdateString("pages","all")
    success = pdf.TextReplace("check",json,jsonOut)
    if success == false {
        fmt.Println(pdf.LastErrorText())
        pdf.DisposePdf()
        json.DisposeJsonObject()
        jsonOut.DisposeJsonObject()
        return
    }

    fmt.Println("pages all, first occurrence: found on page(s) ", *jsonOut.StringOf("replacements[0].pages"))

    //  Every occurrence on every page.
    json.UpdateString("labels[0].occurrence","all")
    success = pdf.TextReplace("apply",json,jsonOut)
    if success == false {
        fmt.Println(pdf.LastErrorText())
        pdf.DisposePdf()
        json.DisposeJsonObject()
        jsonOut.DisposeJsonObject()
        return
    }

    fmt.Println("pages all, every occurrence: ", jsonOut.IntOf("replacements[0].count"), " replaced on page(s) ", *jsonOut.StringOf("replacements[0].pages"))

    success = pdf.WriteFile("qa_output/order_shipped.pdf")
    if success == false {
        fmt.Println(pdf.LastErrorText())
        pdf.DisposePdf()
        json.DisposeJsonObject()
        jsonOut.DisposeJsonObject()
        return
    }

    //  Sample output:

    //  pages 2: found on page(s) 2
    //  pages all, first occurrence: found on page(s) 1
    //  pages all, every occurrence: 2 replaced on page(s) 1,2

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