Zig

Get a Digest Message as an Email Object

Demonstrates the Chilkat Email.GetDigestEmail method, which copies the Nth digest email contained within a multipart/digest into another Email object. The first digest is at index 0; the NumDigests property gives the count. This example loads a digest email and lists each bundled message's subject.

Background: A multipart/digest packs many separate emails into one carrier message — historically used by mailing lists to send a single daily bundle of that day's posts. GetDigestEmail unpacks each member into a full Email object so it can be read or processed individually. This differs from GetAttachedEmail, which extracts messages attached to an ordinary email rather than the members of a digest.

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Zig

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

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

    // Demonstrates the GetDigestEmail method, which copies the Nth digest email contained
    // within a multipart/digest into another Email object.  The first digest is at index 0;
    // use the NumDigests property for the count.

    const email = try chilkat.Email.init();
    defer email.deinit();

    email.loadEml("qa_data/eml/digest.eml") catch {
        std.debug.print("{s}\n", .{try email.getLastErrorText(alloc)});
        return;
    };

    const n = email.getNumDigests();
    std.debug.print("NumDigests = {d}\n", .{n});

    // Retrieve each bundled message as its own Email object.
    const digest_email = try chilkat.Email.init();
    defer digest_email.deinit();
    var i: i32 = 0;
    i = 0;
    while (i < n) : (i += 1) {
        try email.getDigestEmail(i, digest_email);
        std.debug.print("Digest {d} subject: {s}\n", .{ i, try digest_email.getSubject(alloc) });
    }

    // Note: The path "qa_data/..." is a relative local filesystem path,
    // relative to the current working directory of the running application.
}