Zig

Get an Alternative Body into a BinData

Demonstrates the Chilkat Email.GetAlternativeBodyBd method, which copies the contents of the Nth alternative body into a BinData object. The first alternative body is at index 0, and it should only be called when NumAlternatives is greater than 0. This example builds a message with plain-text and HTML alternatives and copies the first into a BinData.

Background: This is the binary counterpart to GetAlternativeBody (which returns text). Reading an alternative into a BinData preserves the exact bytes — important when a body part uses a binary or unusual transfer encoding, or when you intend to hash it or write it out verbatim rather than decode it to a string.

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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 GetAlternativeBodyBd method, which copies the contents of the Nth
    // alternative body into a BinData object.  The first alternative body is at index 0; call
    // only when NumAlternatives is greater than 0.

    const email = try chilkat.Email.init();
    defer email.deinit();
    email.setSubject("GetAlternativeBodyBd example");

    email.setTextBody("This is the plain-text alternative.", "text/plain");
    email.addHtmlAlternativeBody("<html><body>This is the HTML alternative.</body></html>") catch {};

    // Copy the first alternative body (index 0) into a BinData object.
    const bd = try chilkat.BinData.init();
    defer bd.deinit();

    email.getAlternativeBodyBd(0, bd) catch {
        std.debug.print("{s}\n", .{try email.getLastErrorText(alloc)});
        return;
    };

    std.debug.print("Alternative 0 size (bytes) = {d}\n", .{bd.getNumBytes()});
}