Zig

Fetch a Text IMAP Attachment as a String

Demonstrates the Chilkat Imap.FetchAttachmentString method, which returns one text attachment decoded to a string. The first argument is the Email, the second is the zero-based attachment index, and the third is the charset used to decode the bytes. This example returns the first attachment as a UTF-8 string.

Background: This is the convenient form when you simply want a small text attachment's content inline as a string. Only use it for attachments known to be text; decoding binary content through a charset can alter or corrupt the bytes. For binary data use FetchAttachmentBd, and for large text a StringBuilder (via FetchAttachmentSb) avoids an extra copy.

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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 Imap.FetchAttachmentString method, which downloads one text attachment and
    // returns it decoded to a string.  The 1st argument is the Email, the 2nd is the zero-based
    // attachment index, and the 3rd is the charset used to decode the bytes.
    //
    // 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) {
        // FetchAttachmentString returns a string, so assign it to a string variable.
        const attach_text = imap.fetchAttachmentString(alloc, email, 0, "utf-8") catch {
            std.debug.print("{s}\n", .{try imap.getLastErrorText(alloc)});
            return;
        };

        std.debug.print("{s}\n", .{attach_text});
    }

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