Objective-C

Check if a MIME Entity is multipart/alternative

Demonstrates the Chilkat Mime.IsMultipartAlternative method, which returns whether the Content-Type is exactly multipart/alternative. It takes no arguments.

Note: The file path is relative to the application's current working directory. Absolute paths may also be used. Supply the path to your own file.

Background: Recognizing multipart/alternative matters because its children are the same content in different formats — you display one (usually the last renderable), not all of them. That is the opposite of multipart/mixed, where every child is shown.

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Objective-C

#import <CkoMime.h>

BOOL success = NO;

//  Demonstrates the Mime.IsMultipartAlternative method, which returns whether the Content-Type is multipart/alternative.  It takes no arguments.

CkoMime *mime = [[CkoMime alloc] init];
success = [mime LoadMimeFile: @"qa_data/multipart_message.eml"];
if (success == NO) {
    NSLog(@"%@",mime.LastErrorText);
    return;
}

if ([mime IsMultipartAlternative]) {
    NSLog(@"%@",@"This is a multipart/alternative entity.");
}
else {
    NSLog(@"%@",@"This is not multipart/alternative.");
}