Fetch an IMAP Attachment into a BinData

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Demonstrates the Chilkat Imap.FetchAttachmentBd method, which stores one attachment's bytes in a BinData object. The first argument is the Email, the second is the zero-based attachment index, and the third is the BinData, which is cleared before the operation. This example fetches the first attachment and prints its byte count.

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

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

    // Demonstrates the Imap.FetchAttachmentBd method, which downloads one attachment's bytes into
    // a BinData object.  The 1st argument is the Email, the 2nd is the zero-based attachment
    // index, and the 3rd is the BinData (which is cleared first).
    //
    // The message is fetched headers-only, then the attachment is downloaded on demand.

    const imap = try chilkat.Imap.init();
    defer imap.deinit();

    imap.setSsl(true);
    imap.setPort(993);

    imap.connect("imap.example.com") catch {
        std.debug.print("{s}\n", .{try imap.getLastErrorText(alloc)});
        return;
    };

    imap.login("user@example.com", "myPassword") catch {
        std.debug.print("{s}\n", .{try imap.getLastErrorText(alloc)});
        return;
    };

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

    // Fetch only the message headers.  Attachment bodies are NOT downloaded, but the ckx-imap-*
    // metadata describing the attachments is present, so the attachment info methods still work.
    const headers_only = true;
    const use_uid = false;
    const seq_num = 1;
    const email = try chilkat.Email.init();
    defer email.deinit();
    imap.fetchEmail(headers_only, @as(u32, @intCast(seq_num)), use_uid, email) catch {
        std.debug.print("{s}\n", .{try imap.getLastErrorText(alloc)});
        return;
    };

    const num_attach = imap.getMailNumAttach(email);
    if (num_attach > 0) {
        // Download just the first attachment's bytes from the server into a BinData.
        const bd = try chilkat.BinData.init();
        defer bd.deinit();
        imap.fetchAttachmentBd(email, 0, bd) catch {
            std.debug.print("{s}\n", .{try imap.getLastErrorText(alloc)});
            return;
        };

        std.debug.print("Attachment size: {d} bytes\n", .{bd.getNumBytes()});
    }

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