Zig

Save All MIME Attachments to Files

Demonstrates the Chilkat Mime.PartsToFiles method, which recursively traverses the MIME tree and saves each part having a nonempty filename parameter to a directory. The first argument is the destination directory and the second is a StringTable that receives the saved filenames.

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

Background: This extracts every named attachment from a message in one call, walking the whole tree so it finds attachments nested inside multipart containers. It saves only parts that declare a filename — inline body parts without one are skipped — and reports what it wrote via the StringTable, which is handy for logging or follow-up processing. The destination directory must already exist.

Chilkat Zig Downloads

Download Chilkat for Zig

Zig

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

pub fn main(init: std.process.Init) !void {
    const alloc = init.arena.allocator();

    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;
    };

    // Recursively traverse the MIME tree and save each part that has a nonempty "filename" parameter
    // to a directory.  The 1st argument is the destination directory and the 2nd is a StringTable
    // that receives the saved filenames.
    const saved_files = try chilkat.StringTable.init();
    defer saved_files.deinit();
    mime.partsToFiles("qa_output/attachments", saved_files) catch {
        std.debug.print("{s}\n", .{try mime.getLastErrorText(alloc)});
        return;
    };

    const n = saved_files.getCount();
    std.debug.print("Saved {d} files:\n", .{n});
    var i: i32 = 0;
    i = 0;
    while (i < n) : (i += 1) {
        const name = saved_files.stringAt(alloc, i) catch {
            std.debug.print("{s}\n", .{try saved_files.getLastErrorText(alloc)});
            return;
        };

        std.debug.print("{s}\n", .{name});
    }
}