Zig

Fetch a Set of POP3 Messages by UIDL

Demonstrates the Chilkat MailMan.FetchUidlSet method, which retrieves the messages whose UIDLs are listed in a StringTable and appends them to an EmailBundle. The arguments are the UIDL StringTable, headersOnly, numBodyLines, and the EmailBundle. This example fetches two specific messages by UIDL.

Background: This is the efficient way to download a selected subset of a mailbox in one call — exactly the pattern for an incremental client: list the mailbox UIDLs, compare against the ones you've already stored, and fetch only the new UIDLs as a set. It avoids re-downloading messages you already have while still pulling everything new in a single operation.

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

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

    // Demonstrates the MailMan.FetchUidlSet method, which retrieves the messages whose UIDLs are
    // listed in a StringTable and appends them to an EmailBundle.  The arguments are the UIDL
    // StringTable, headersOnly, numBodyLines, and the EmailBundle.  The messages remain on the
    // server.

    const mailman = try chilkat.MailMan.init();
    defer mailman.deinit();

    // Configure the POP3 server connection.
    mailman.setMailHost("pop.example.com");
    mailman.setMailPort(995);
    mailman.setPopSsl(true);
    mailman.setPopUsername("user@example.com");
    mailman.setPopPassword("myPassword");

    // Build the set of UIDLs to fetch.
    const uidls = try chilkat.StringTable.init();
    defer uidls.deinit();
    uidls.append("0000000123abcdef") catch {};
    uidls.append("0000000124abcdef") catch {};

    // Fetch the listed messages (full bodies) into a bundle.
    // headersOnly=false (fetch the entire message).
    // Note: numBodyLines only applies when headersOnly is true (it sets how many lines of the
    // body to include along with the headers).  When headersOnly is false, the entire message
    // is fetched and numBodyLines is ignored.
    const bundle = try chilkat.EmailBundle.init();
    defer bundle.deinit();

    mailman.fetchUidlSet(uidls, false, 0, bundle) catch {
        std.debug.print("{s}\n", .{try mailman.getLastErrorText(alloc)});
        return;
    };

    const n = bundle.getMessageCount();
    std.debug.print("Fetched {d} messages.\n", .{n});

    const email = try chilkat.Email.init();
    defer email.deinit();
    var i: i32 = 0;
    i = 0;
    while (i < n) : (i += 1) {
        try bundle.emailAt(i, email);
        std.debug.print("{s}\n", .{try email.getSubject(alloc)});
    }

    // Note: Explicitly connecting/authenticating is optional.  Chilkat MailMan automatically
    // connects and authenticates -- using the property settings above -- whenever a server
    // operation requires it.  Calling the explicit connect/authenticate methods can still be
    // helpful to determine whether a failure occurs while connecting or while authenticating.
}