(Objective-C) 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--

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#import <CkoMime.h>

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

CkoMime *mime = [[CkoMime alloc] init];

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

BOOL success = [mime LoadMimeFile: @"sampleMime1.txt"];
if (success == NO) {
    NSLog(@"%@",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:
CkoMime *part1 = 0;
part1 = [mime GetPart: [NSNumber numberWithInt: 0]];
NSLog(@"%@",[part1 GetBodyDecoded]);

CkoMime *part2 = 0;
part2 = [mime GetPart: [NSNumber numberWithInt: 1]];
NSLog(@"%@",[part2 GetBodyDecoded]);

CkoMime *part3 = 0;
part3 = [mime GetPart: [NSNumber numberWithInt: 2]];
NSLog(@"%@",[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..)
NSLog(@"%@",[part1 GetBodyEncoded]);
NSLog(@"%@",[part2 GetBodyEncoded]);
NSLog(@"%@",[part3 GetBodyEncoded]);