Zig

Determine the Number of Unseen Email Messages

Demonstrates how to determine how many unseen messages exist in an email account on an IMAP server. 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 imap = try chilkat.Imap.init();
    defer imap.deinit();

    // Connect to an IMAP server.
    // Use TLS
    imap.setSsl(true);
    imap.setPort(993);
    imap.connect("imap.example.com") catch {
        std.debug.print("{s}\n", .{try imap.getLastErrorText(alloc)});
        return;
    };

    // Login
    imap.login("***", "***") catch {
        std.debug.print("{s}\n", .{try imap.getLastErrorText(alloc)});
        return;
    };

    // Select an IMAP mailbox
    imap.selectMailbox("Inbox") catch {
        std.debug.print("{s}\n", .{try imap.getLastErrorText(alloc)});
        return;
    };

    // After selecting the mailbox. the total number of emails
    // is immediately available:
    const total_num = imap.getNumMessages();
    std.debug.print("Num messages = {d}\n", .{total_num});

    // To determine the number of unseen messages, a call
    // to Search is required, which returns the set of UIDs
    // of all unseen messages.

    // We can choose to fetch UIDs or sequence numbers.
    const fetch_uids = true;
    const message_set = try chilkat.MessageSet.init();
    defer message_set.deinit();
    imap.queryMbx("UNSEEN", fetch_uids, message_set) catch {
        std.debug.print("{s}\n", .{try imap.getLastErrorText(alloc)});
        return;
    };

    const num_unseen = @as(u32, @intCast(message_set.getCount()));
    std.debug.print("{d}\n", .{num_unseen});

    std.debug.print("UIDs ----\n", .{});

    // Display the UIDs
    var i: i32 = 0;
    while (i < message_set.getCount()) {
        std.debug.print("{d}\n", .{message_set.getId(i)});
        i = i + 1;
    }

    // Disconnect from the IMAP server.
    try imap.disconnect();
}