Zig

Attach a File with an Explicit Content Type

Demonstrates the Chilkat Email.AddFileAttachment2 method, which attaches a file from the filesystem and lets you explicitly specify its content type rather than having Chilkat infer it from the file extension. This example attaches a binary file as application/octet-stream.

Background: Extension-based type detection is convenient but not always right — a file may have an unusual or missing extension, or you may need a very specific MIME type for the recipient to process it correctly. Specifying the content type explicitly removes the guesswork. application/octet-stream is the generic "arbitrary binary data" type, a safe default that tells the client to treat the attachment as an opaque download rather than trying to render it.

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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 AddFileAttachment2 method, which attaches a file and lets you
    // explicitly specify its content type instead of letting Chilkat infer it.

    const email = try chilkat.Email.init();
    defer email.deinit();
    email.setSubject("Email with a file attachment");
    email.setBody("Please see the attached file.");

    // Attach a file, explicitly specifying the content type.
    email.addFileAttachment2("qa_data/attachments/data.bin", "application/octet-stream") catch {
        std.debug.print("{s}\n", .{try email.getLastErrorText(alloc)});
        return;
    };

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

    // Note: The path "qa_data/attachments/data.bin" is a relative local filesystem path,
    // relative to the current working directory of the running application.
}