Zig

Create a multipart/related MIME Entity

Demonstrates the Chilkat Mime.NewMultipartRelated method, which initializes the object as an empty multipart/related entity. It takes no arguments; the primary part and its related resources are then appended.

Note: The file paths are relative to the application's current working directory. Absolute paths may also be used. Supply the paths appropriate to your own environment.

Background: multipart/related ties a primary part to the resources it references — most commonly an HTML body and the inline images it embeds via cid: references. Unlike a plain attachment, a related image is displayed within the message rather than listed separately. The HTML part comes first, followed by each referenced resource with a matching Content-ID.

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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 Mime.NewMultipartRelated method, which initializes the object as an empty
    // multipart/related entity, clearing any existing content.  It takes no arguments.

    const mime = try chilkat.Mime.init();
    defer mime.deinit();

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

    // multipart/related groups a primary part with the resources it references, such as an HTML body
    // and the inline images it displays.
    const html_part = try chilkat.Mime.init();
    defer html_part.deinit();
    html_part.setBodyFromHtml("<html><body><img src=\"cid:logo\"></body></html>") catch {
        std.debug.print("{s}\n", .{try html_part.getLastErrorText(alloc)});
        return;
    };

    mime.appendPart(html_part) catch {
        std.debug.print("{s}\n", .{try mime.getLastErrorText(alloc)});
        return;
    };

    mime.appendPartFromFile("qa_data/logo.png") catch {
        std.debug.print("{s}\n", .{try mime.getLastErrorText(alloc)});
        return;
    };

    std.debug.print("Number of parts: {d}\n", .{mime.getNumParts()});
}