Zig

Add an HTML Alternative Body to an Email

Demonstrates the Chilkat Email.AddHtmlAlternativeBody method, which adds an HTML alternative body. Combined with a plain-text body, it produces a multipart/alternative email that offers both representations of the same content. This example sets a plain-text body, adds an HTML alternative, and prints the resulting alternative count.

Background: A well-formed HTML email usually ships two versions of the body: a rich HTML version and a plain-text fallback, wrapped in a multipart/alternative container. The receiving client displays whichever it prefers — modern clients show the HTML, while text-only clients (or spam filters and accessibility tools) use the plain text. Providing both improves deliverability and ensures every recipient can read the message.

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Zig

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

pub fn main() !void {
    // Demonstrates the AddHtmlAlternativeBody method, which adds an HTML alternative body to
    // the email.  Combined with a plain-text body, this produces a multipart/alternative
    // email that offers both representations.

    const email = try chilkat.Email.init();
    defer email.deinit();
    email.setSubject("Plain-text and HTML alternatives");

    // Start with a plain-text body.
    email.setTextBody("This is the plain-text version of the message.", "text/plain");

    // Add an HTML alternative, creating a multipart/alternative email.
    email.addHtmlAlternativeBody("<html><body><b>This is the HTML version.</b></body></html>") catch {};

    std.debug.print("NumAlternatives = {d}\n", .{email.getNumAlternatives()});
}