Rust

Extract Embedded Files from PDF

Demonstrates how to get information about the embedded files (if any) contained within a PDF, and shows how to extract each file.

Note: This example requires Chilkat v9.5.0.95 or greater.

Rust

// This example requires the Chilkat API to have been previously unlocked.
// See Global Unlock Sample for sample code.

let pdf = chilkat::Pdf::new();

if pdf.load_file("qa_data/pdf/embedded_files/my_embedded_files_test.pdf").is_err() {
    println!("{}", pdf.last_error_text());
    return;
}

// Note: The embedded file functionality was added in Chilkat v9.5.0.95

// How many embedded files exist within the opened PDF?
let num_files = pdf.num_embedded_files();
println!("Number of embedded files: {}", num_files);

let json = chilkat::JsonObject::new();
json.set_emit_compact(false);

let bd = chilkat::BinData::new();

// Get information about each file, and extract each to the filesystem.
let mut i = 0;
while i < num_files {

    if pdf.get_embedded_file_info(i, &json).is_err() {
        println!("{}", pdf.last_error_text());
        return;
    }

    println!("{}", json.emit().unwrap_or_default());

    // Get the filename from the JSON.
    let mut filename = "someFile.dat".to_string();

    // The filename SHOULD always be present..
    if json.has_member("filename") {
        filename = json.string_of("filename").unwrap_or_default();
    }

    // Get the file data.
    if pdf.get_embedded_file_bd(i, &bd).is_err() {
        println!("{}", pdf.last_error_text());
        return;
    }

    // Save the contents of the bd to the filename (in the current working directory) in the filesystem.
    if bd.write_file(&filename).is_err() {
        println!("Failed to write output file.");
    }

    i = i + 1;
}

// Sample output for the above code:

// Number of embedded files: 3
// {
//   "filename": "employees.json",
//   "desc": "JSON",
//   "subType": "application/json",
//   "size": 159,
//   "creationDate": "D:20230715170506-05'00'",
//   "modDate": "D:20160207153838-05'00'"
// }
// 
// {
//   "filename": "rsaPubKey.pem",
//   "desc": "RSA Public Key PEM",
//   "size": 451,
//   "creationDate": "D:20230715170546-05'00'",
//   "modDate": "D:20150724133153-05'00'"
// }
// 
// {
//   "filename": "starfish.jpg",
//   "desc": "Starfish JPG",
//   "subType": "image/jpeg",
//   "size": 6229,
//   "creationDate": "D:20230715170356-05'00'",
//   "modDate": "D:20080529103055-05'00'"
// }