(Swift 2) Get the text body content of a MIME part.

Explains and demonstrates the GetBodyEncoded and GetBodyDecoded methods. This example uses the MIME test data located at http://www.chilkatsoft.com/testData/sampleMime1.txt

The sampleMime1.txt contains:

Content-Type: multipart/mixed;
 boundary="------------070404010201060604000708";

This is a multi-part message in MIME format.

--------------070404010201060604000708
Content-Transfer-Encoding: quoted-printable
Content-Type: text/plain; charset="utf-8";

Falsches =C3=9Cben von Xylophonmusik qu=C3=A4lt jeden gr=C3=B6=C3=9Feren Zwe=
rg.
--------------070404010201060604000708
Content-Transfer-Encoding: base64
Content-Type: text/plain; charset="utf-8";

RmFsc2NoZXMgw5xiZW4gdm9uIFh5bG9waG9ubXVzaWsgcXXDpGx0IGplZGVuIGdyw7bDn2VyZW4g
Wndlcmcu

--------------070404010201060604000708
Content-Transfer-Encoding: 8bit
Content-Type: text/plain; charset="iso-8859-1";

Falsches Üben von Xylophonmusik quält jeden größeren Zwerg.
--------------070404010201060604000708--

Chilkat Downloads for the Swift Programming Language MAC OS X (Cocoa) Objective-C/Swift Libs iOS Objective-C/Swift Libs

func chilkatTest() {
    // This example assumes the Chilkat API to have been previously unlocked.
    // See Global Unlock Sample for sample code.

    let mime = CkoMime()

    // Load the sampleMime1.txt file into the MIME object.
    // (This file is available at http://www.chilkatsoft.com/testData/sampleMime1.txt )

    var success: Bool = mime.LoadMimeFile("sampleMime1.txt")
    if success == false {
        print("\(mime.LastErrorText)")
        return
    }

    // The sampleMime1.txt is a MIME document with a top-level 
    // multipart/mixed containing 3 sub-parts, each of which has the 
    // same body text but with different content-transfer-encodings and 
    // using different character encodings (utf-8 and iso-8859-1).

    // Calling mime.GetBodyEncoded or mime.GetBodyDecoded on the 
    // top-level multipart/mixed MIME object will return an empty string.
    // It is because the "body" of a multipart MIME object is always empty.
    // A multipart MIME object contains sub-parts (each a MIME object),
    // and it is only the leaf-objects that can have non-empty bodies.

    // Get GetBodyDecoded method returns the body text decoded
    // from whatever the content-transfer-encoding may be, and
    // converted from whatever charset encoding might be used.
    // In this case, calling GetBodyDecoded on each of the three
    // sub-parts will return the same string.
    // To demonstrate:
    var part1: CkoMime?
    part1 = mime.GetPart(0)
    print("\(part1!.GetBodyDecoded())")

    var part2: CkoMime?
    part2 = mime.GetPart(1)
    print("\(part2!.GetBodyDecoded())")

    var part3: CkoMime?
    part3 = mime.GetPart(2)
    print("\(part3!.GetBodyDecoded())")

    // The GetBodyEncoded method will NOT decode from 
    // whatever content-transfer-encoding is used.  However, it will
    // convert from whatever internal character encoding
    // may be used to return a string appropriate for the calling
    // programming language (for example, in .NET or any language
    // using ActiveX, all strings are Unicode..)
    print("\(part1!.GetBodyEncoded())")
    print("\(part2!.GetBodyEncoded())")
    print("\(part3!.GetBodyEncoded())")

    part1 = nil
    part2 = nil
    part3 = nil

}