Zig

Unzip an Email's Zip Attachments

Demonstrates the Chilkat Email.UnzipAttachments method, which unzips and replaces any Zip file attachments with their expanded contents. For example, if an email contains a single Zip holding three files, that Zip attachment is replaced by the three files as individual attachments. This example loads an email and expands its Zip attachments.

Background: Senders often bundle several files into one .zip to keep a message tidy or to compress large content. UnzipAttachments reverses that automatically, so downstream processing can work with the individual files directly rather than having to detect, extract, and re-inject archive contents. It is the inverse of ZipAttachments.

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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 UnzipAttachments method, which unzips and replaces any Zip file
    // attachments with their expanded contents.  For example, a single Zip containing 3 files
    // is replaced by those 3 files as individual attachments.

    const email = try chilkat.Email.init();
    defer email.deinit();

    email.loadEml("qa_data/eml/with_zip_attachment.eml") catch {
        std.debug.print("{s}\n", .{try email.getLastErrorText(alloc)});
        return;
    };

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

    // Expand any Zip attachments in place.
    email.unzipAttachments() catch {
        std.debug.print("{s}\n", .{try email.getLastErrorText(alloc)});
        return;
    };

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

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