Zig

PDF List Unsigned Signature Fields

See more PDF Signatures Examples

Demonstrates how to list the unsigned signature fields in a PDF.

Note: This example requires Chilkat v9.5.0.90 or greater.

Zig

const std = @import("std");
const chilkat = @import("chilkat");

pub fn main(init: std.process.Init) !void {
    const alloc = init.arena.allocator();

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

    const pdf = try chilkat.Pdf.init();
    defer pdf.deinit();

    // Load a PDF containing 2 remaining unsigned signature fields:
    pdf.loadFile("qa_data/pdf/doctor_patient_parent.pdf") catch {
        std.debug.print("{s}\n", .{try pdf.getLastErrorText(alloc)});
        return;
    };

    // Note: This example requires Chilkat v9.5.0.90 or greater.
    const json = try chilkat.JsonObject.init();
    defer json.deinit();
    pdf.getUnsignedSigFields(json) catch {};

    json.setEmitCompact(false);
    std.debug.print("{s}\n", .{try json.emit(alloc)});

    // Result:
    // {
    //   "unsignedSigField": [
    //     "doctor_signature",
    //     "parent_signature"
    //   ]
    // }

    // To iterate over the field names:
    var str_val: [:0]const u8 = "";

    var i: i32 = 0;
    const count_i = json.sizeOfArray("unsignedSigField");
    while (i < count_i) {
        json.setI(i);
        str_val = try json.stringOf(alloc, "unsignedSigField[i]");
        std.debug.print("{s}\n", .{str_val});
        i = i + 1;
    }
}