C# Requires Chilkat v11.7.0+

What PDF Text Replacement Does Not Change: Metadata, Links, Form Fields

See more PDF Text Replacement Examples

TextReplace changes the page content only. A placeholder that also appears in the document's metadata (the Title, Author, Subject, Keywords, Creator or Producer), in a link's target URL, or in a form field's value is left as it is and reported in "notReplaced" with "where" saying which. The invoice template's title is "Invoice for {{customer}}" and its "View this invoice online" link points at a URL that holds {{customer}}. C#

bool 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 invoice_template.pdf

Chilkat.Pdf pdf = new Chilkat.Pdf();
success = pdf.LoadFile("qa_data/pdf/invoice_template.pdf");
if (success == false) {
    Debug.WriteLine(pdf.LastErrorText);
    return;
}

Chilkat.JsonObject json = new Chilkat.JsonObject();
json.UpdateString("placeholders.customer","Acme Corp");
//  (The other placeholders are left as they are for this example.)
json.UpdateString("unusedPlaceholders","keep");

Chilkat.JsonObject jsonOut = new Chilkat.JsonObject();
success = pdf.TextReplace("apply",json,jsonOut);
if (success == false) {
    Debug.WriteLine(pdf.LastErrorText);
    return;
}

Debug.WriteLine("In the page content, customer was replaced " + Convert.ToString(jsonOut.IntOf("replacements[0].count")) + " times.");

//  Where else the placeholder occurs, untouched:
int i = 0;
int count_i = jsonOut.SizeOfArray("notReplaced");
while (i < count_i) {
    jsonOut.I = i;
    Debug.WriteLine("not replaced: {{" + jsonOut.StringOf("notReplaced[i].field") + "}} in " + jsonOut.StringOf("notReplaced[i].where"));
    i = i + 1;
}

success = pdf.WriteFile("qa_output/invoice_customer.pdf");
if (success == false) {
    Debug.WriteLine(pdf.LastErrorText);
    return;
}

//  Sample output:

//  In the page content, customer was replaced 2 times.
//  not replaced: {{customer}} in metadata
//  not replaced: {{customer}} in linkTarget