Objective-C

Create a multipart/alternative MIME Entity

Demonstrates the Chilkat Mime.NewMultipartAlternative method, which initializes the object as an empty multipart/alternative entity. It takes no arguments; the alternative representations are then appended.

Background: multipart/alternative holds several renderings of the same content and lets the client pick the best one it can display — the standard way to send an email as both plain text and HTML. Order matters: parts go from least to most preferred, so the plain-text version comes first and the HTML last, and a client shows the last one it understands.

Chilkat Objective-C Downloads

Download Chilkat for Objective-C

Objective-C

#import <CkoMime.h>

BOOL success = NO;

//  Demonstrates the Mime.NewMultipartAlternative method, which initializes the object as an empty
//  multipart/alternative entity, clearing any existing content.  It takes no arguments.

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

success = [mime NewMultipartAlternative];
if (success == NO) {
    NSLog(@"%@",mime.LastErrorText);
    return;
}

//  multipart/alternative holds two representations of the SAME content; the client displays the
//  last one it can render.  Add a plain-text part, then an HTML part.
CkoMime *textPart = [[CkoMime alloc] init];
success = [textPart SetBodyFromPlainText: @"Hello (plain text version)."];
if (success == NO) {
    NSLog(@"%@",textPart.LastErrorText);
    return;
}

success = [mime AppendPart: textPart];
if (success == NO) {
    NSLog(@"%@",mime.LastErrorText);
    return;
}

CkoMime *htmlPart = [[CkoMime alloc] init];
success = [htmlPart SetBodyFromHtml: @"<html><body><b>Hello</b> (HTML version).</body></html>"];
if (success == NO) {
    NSLog(@"%@",htmlPart.LastErrorText);
    return;
}

success = [mime AppendPart: htmlPart];
if (success == NO) {
    NSLog(@"%@",mime.LastErrorText);
    return;
}

NSLog(@"%@%d",@"Number of alternatives: ",[mime.NumParts intValue]);