Lua

Parse MIME Header Fields

See more MIME Examples

Demonstrates how to parse MIME header fields, including Content-Type, Content-Disposition, and Content-Transfer-Encoding.

This example uses a MIME test file located at http://www.chilkatsoft.com/testData/sampleMime2.txt. It contains the following MIME:

Content-Type: multipart/mixed;
 boundary="------------080707010302060306060800";

This is a multi-part message in MIME format.

--------------080707010302060306060800
Content-Type: text/plain
Content-Transfer-Encoding: 7bit

This is the plain-text body.
--------------080707010302060306060800
Content-Disposition: attachment; filename="starfish.gif";
Content-Transfer-Encoding: base64
Content-Type: image/gif; name="starfish.gif";

R0lGODlhIAAgAPcAAP///+/v7/f39+/n5/fv7//39/fn597OzufW1tbGxs69vffe3u/W1salpZQQ
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--------------080707010302060306060800--

Lua

local chilkat = require("chilkat")

-- This example requires the Chilkat API to have been previously unlocked.
-- See Global Unlock Sample for sample code.

local mime = chilkat.Mime.new()

-- Load the sampleMime2.txt file into the MIME object.
-- (This file is available at http://www.chilkatsoft.com/testData/sampleMime2.txt )

local success = mime:load_mime_file("sampleMime2.txt")
if not success then
    print(mime.last_error_text)
    return
end

-- The GIF image is the 2nd sub-part located directly under the
-- top-level MIME node.  Indexing begins at 0, therefore the 2nd
-- sub-part is at index 1.
local part2 = chilkat.Mime.new()
success = mime:part_at(1, part2)
if not success then
    print(mime.last_error_text)
    return
end

-- -------------------------------
-- Content-Disposition
-- -------------------------------
-- In this example, the Content-Disposition header field
-- contains this value:
-- attachment; filename="starfish.gif";

-- To get the "filename", call GetHeaderFieldAttribute
-- Header field names and attribute names are case insensitive.
local filename = part2:get_header_field_attribute("Content-Disposition", "filename")
print("Filename: " .. filename)

-- Because the "filename" is so often accessed, it is also available
-- by accessing the "Filename" property:
print("Filename: " .. part2.filename)

-- The disposition (without attributes) which in this case
-- is the string "attachment" is accessed via the Disposition property:
print("Disposition: " .. part2.disposition)

-- To get the full value of the Content-Disposition header field,
-- call GetHeaderField.
print("Content-Disposition: " .. part2:get_header_field("Content-Disposition"))

-- -------------------------------
-- Content-Type
-- -------------------------------
-- In this example, the Content-Type header field
-- contains this value:
-- image/gif; name="starfish.gif";

-- To get the "name", call GetHeaderFieldAttribute
local name = part2:get_header_field_attribute("Content-Type", "name")
print("Content-Type name: " .. name)

-- Because the "name" is so often accessed, it is also available
-- by accessing the "Name" property:
print("Content-Type name: " .. part2.name)

-- The content-type without attributes is available in the
-- ContentType property:
print("Content-Type: " .. part2.content_type)

-- To get the full value of the Content-Type header field,
-- call GetHeaderField.
print("Content-Type: " .. part2:get_header_field("Content-Type"))

-- -------------------------------
-- Content-Transfer-Encoding
-- -------------------------------

-- The Encoding property contains the value of the
-- Content-Transfer-Encoding property.
-- Calling GetHeaderField("Content-Transfer-Encoding") is
-- equivalent to accessing the Encoding property:
print("Content-Transfer-Encoding: " .. part2.encoding)
print("Content-Transfer-Encoding: " .. part2:get_header_field("Content-Transfer-Encoding"))

print("Finished.")