Zig

Check if a MIME Part is an Attachment

Demonstrates the Chilkat Mime.IsAttachment method, which returns whether the current part's Content-Disposition is attachment (matched case-insensitively). It takes no arguments.

Note: The file path is relative to the application's current working directory. Absolute paths may also be used. Supply the path to your own file.

Background: Whether a part is an attachment is about disposition, not content type — an image can be inline (Content-Disposition: inline) or an attachment. This predicate keys off that header, which is the right basis for deciding what to list as a downloadable attachment versus what to render within the message body.

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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 Mime.IsAttachment method, which returns whether the part's Content-Disposition is attachment.  It takes no arguments and applies to the current
    // part.  This example iterates the parts of a multipart message and reports which ones match.

    const mime = try chilkat.Mime.init();
    defer mime.deinit();
    mime.loadMimeFile("qa_data/multipart_message.eml") catch {
        std.debug.print("{s}\n", .{try mime.getLastErrorText(alloc)});
        return;
    };

    const n = mime.getNumParts();
    const part = try chilkat.Mime.init();
    defer part.deinit();
    var i: i32 = 0;
    i = 0;
    while (i < n) : (i += 1) {
        mime.partAt(i, part) catch {
            std.debug.print("{s}\n", .{try mime.getLastErrorText(alloc)});
            return;
        };

        if (part.isAttachment()) {
            std.debug.print("Part {d} ({s}) is an attachment.\n", .{ i, try part.getContentType(alloc) });
        }
    }
}