Rust Requires Chilkat v11.7.0+

Page Numbers, Dates and the File Name in a PDF Watermark

See more PDF Watermark Examples

Demonstrates the placeholders a text watermark understands, each replaced per page as the watermark is added: {page} is the page number, {pages} the page count, {date:FORMAT} the current local date and time, and {filename} the name of the file that was loaded. Two braces give a literal brace. pageNumber.start sets what {page} is on the first page, which is how a numbering that ignores a cover is produced, and pageNumber.style formats both {page} and {pages} as decimal, romanUpper, romanLower, letterUpper or letterLower. Rust

// 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 four_pages.pdf

let pdf = chilkat::Pdf::new();
if pdf.load_file("qa_data/pdf/four_pages.pdf").is_err() {
    println!("{}", pdf.last_error_text());
    return;
}

let json = chilkat::JsonObject::new();
let _ = json.update_string("type", "text");
let _ = json.update_string("text", "Page {page} of {pages}  -  printed {date:yyyy-MM-dd HH:mm}  -  {filename}");
let _ = json.update_string("id", "pagefoot");
let _ = json.update_string("position.align", "bottom");
let _ = json.update_number("position.margin", "24");
let _ = json.update_number("font.size", "9");
let _ = json.update_string("color", "#505050");

let json_out = chilkat::JsonObject::new();
if pdf.watermark("add", &json, &json_out).is_err() {
    println!("{}", pdf.last_error_text());
    return;
}

println!("footer pages: {}", json_out.string_of("pages").unwrap_or_default());

// Roman numerals that start at i on page 2, so that a cover page is not numbered.
let pdf2 = chilkat::Pdf::new();
if pdf2.load_file("qa_data/pdf/four_pages.pdf").is_err() {
    println!("{}", pdf2.last_error_text());
    return;
}

let json2 = chilkat::JsonObject::new();
let _ = json2.update_string("type", "text");
let _ = json2.update_string("text", "- {page} -");
let _ = json2.update_string("id", "roman");
let _ = json2.update_string("pages", "2-");
let _ = json2.update_int("pageNumber.start", 1);
let _ = json2.update_string("pageNumber.style", "romanLower");
let _ = json2.update_string("position.align", "bottom");
let _ = json2.update_number("font.size", "10");
if pdf2.watermark("add", &json2, &json_out).is_err() {
    println!("{}", pdf2.last_error_text());
    return;
}

println!("roman pages: {}", json_out.string_of("pages").unwrap_or_default());

if pdf.write_file("qa_output/four_pages_numbered.pdf").is_err() {
    println!("{}", pdf.last_error_text());
    return;
}

// Sample output:

// footer pages: 1-4
// roman pages: 2-4