Objective-C

Check if a MIME Part is HTML

Demonstrates the Chilkat Mime.IsHtml method, which returns whether the Content-Type is exactly text/html. It takes no arguments and applies to the current part.

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: Finding the HTML part is the common goal when rendering a message richly — it is the formatted version a mail client prefers. In a multipart/alternative you would locate it with this predicate and fall back to the plain-text part when it is absent.

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Objective-C

#import <CkoMime.h>

BOOL success = NO;

//  Demonstrates the Mime.IsHtml method, which returns whether the Content-Type is text/html.  It takes no arguments and applies to the current
//  part.  This example iterates the parts of a multipart message and reports which ones match.

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

int n = [mime.NumParts intValue];
CkoMime *part = [[CkoMime alloc] init];
int i;
for (i = 0; i <= n - 1; i++) {
    success = [mime PartAt: [NSNumber numberWithInt: i] subPart: part];
    if (success == NO) {
        NSLog(@"%@",mime.LastErrorText);
        return;
    }

    if ([part IsHtml]) {
        NSLog(@"%@%d%@%@%@",@"Part ",i,@" (",part.ContentType,@") is HTML.");
    }

}