Lua

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.

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Lua

local chilkat = require("chilkat")

local mime = chilkat.Mime.new()
local success = mime:load_mime_file("qa_data/multipart_message.eml")
if not success then
    print(mime.last_error_text)
    return
end

-- 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.
local savedFiles = chilkat.StringTable.new()
success = mime:parts_to_files("qa_output/attachments", savedFiles)
if not success then
    print(mime.last_error_text)
    return
end

local n = savedFiles.count
print("Saved " .. n .. " files:")
for i = 0, n - 1 do
    local name = savedFiles:string_at(i)
    if not savedFiles.last_method_success then
        print(savedFiles.last_error_text)
        return
    end

    print(name)
end