Zig

Get the Size of an Attachment

Demonstrates the Chilkat Email.GetAttachmentSize method, which returns the size in bytes of the attachment at a given zero-based index, or -1 if the index does not identify an existing attachment. This example adds an attachment and prints its size.

Background: The size reported is that of the attachment's actual (decoded) data, not its larger Base64-encoded form on the wire. Knowing per-attachment sizes is handy for enforcing limits, showing a size next to each attachment in a UI, or deciding whether to save or skip a large part. The -1 sentinel is how the method signals an out-of-range index rather than a zero-length attachment.

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Zig

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

pub fn main() !void {
    // Demonstrates the GetAttachmentSize method, which returns the size in bytes of the
    // attachment at the given zero-based index.  It returns -1 if the index does not identify
    // an existing attachment.

    const email = try chilkat.Email.init();
    defer email.deinit();
    email.setSubject("Attachment size");

    email.addStringAttachment("notes.txt", "Some notes for the attachment.") catch {};

    // Get the size in bytes of the first attachment (index 0).
    const sz = email.getAttachmentSize(0);
    std.debug.print("Attachment 0 size (bytes) = {d}\n", .{sz});
}