Objective-C

Set a MIME Body, Preserving Content Headers

Demonstrates the Chilkat Mime.SetBody method, which sets the current part's body while preserving the existing content headers (Content-Type, charset, Content-Transfer-Encoding). The only argument is the body text; it is a void method.

Background: Unlike the SetBodyFrom... methods, which set both the content and the headers that describe it, SetBody replaces only the body text and leaves the existing Content-Type and encoding in place. That is what you want when the media type is already correct and you simply need to swap in new content — updating a templated part, for instance — without re-declaring its type.

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Objective-C

#import <CkoMime.h>
#import <NSString.h>

BOOL success = NO;

//  Demonstrates the Mime.SetBody method, which sets the current part's body while preserving the
//  existing content headers (Content-Type, charset, Content-Transfer-Encoding).  The only argument
//  is the body text.  It is a void method.

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

//  Establish the content headers first.
success = [mime SetBodyFromPlainText: @"initial"];
if (success == NO) {
    NSLog(@"%@",mime.LastErrorText);
    return;
}

//  Replace just the body text, keeping the existing Content-Type and encoding.
[mime SetBody: @"This is the replacement body text."];

NSString *mimeText = [mime GetMime];
if (mime.LastMethodSuccess == NO) {
    NSLog(@"%@",mime.LastErrorText);
    return;
}

NSLog(@"%@",mimeText);