MIME Multipart Boundary and Preamble Properties

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Demonstrates the Boundary property, which gets or sets the raw boundary token of a multipart entity (without surrounding quotation marks), and UseMmDescription, which controls whether the conventional preamble text is emitted when serializing a multipart entity.

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

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

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

    // Create a multipart/mixed entity.
    mime.newMultipartMixed() catch {
        std.debug.print("{s}\n", .{try mime.getLastErrorText(alloc)});
        return;
    };

    // Boundary is the raw boundary token, without surrounding quotation marks.  Chilkat quotes it
    // automatically in the serialized header when required.
    mime.setBoundary("example-boundary");

    // UseMmDescription controls whether the conventional preamble text
    // "This is a multi-part message in MIME format." is emitted.  The default is false.
    mime.setUseMmDescription(true);

    // Add a simple part so the multipart has content.
    const part = try chilkat.Mime.init();
    defer part.deinit();
    part.setBodyFromPlainText("First part.") catch {
        std.debug.print("{s}\n", .{try part.getLastErrorText(alloc)});
        return;
    };

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

    std.debug.print("Boundary = {s}\n", .{try mime.getBoundary(alloc)});

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

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