Zig

Get a Header Field of an Attachment

Demonstrates the Chilkat Email.GetAttachmentHeader method, which returns the value of a named header field of an attachment. The first argument is the zero-based attachment index and the second is the MIME header-field name. This example reads the Content-Disposition header of the first attachment.

Background: Each attachment is a MIME part with its own header block. Where GetAttachmentAttr extracts a single named parameter, GetAttachmentHeader returns the entire value of a header field — for example the full Content-Disposition: attachment; filename="notes.txt" line. That is useful for inspecting or debugging exactly how a part is described, including any custom X- headers a sender may have added.

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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 GetAttachmentHeader method, which returns the value of a header field
    // (by name) of an attachment.  The first argument is the zero-based attachment index and the second is the
    // MIME header-field name.

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

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

    // Get the Content-Disposition header of the first attachment (index 0).
    const disp = try email.getAttachmentHeader(alloc, 0, "Content-Disposition");
    std.debug.print("Attachment 0 Content-Disposition: {s}\n", .{disp});
}