Objective-C

Get the Content-Type of a Related Item

Demonstrates the Chilkat Email.GetRelatedContentType method, which returns the Content-Type of the Nth related content item in an email. The index is zero-based. This example adds a related style sheet and reads its content type.

Background: Each related item declares a Content-Type — image/png for an inline image, text/css for a style sheet, and so on — that tells the rendering client how to use it. Reading the content type lets a program enumerate a message's embedded resources and act on them by kind, for example collecting every inline image while ignoring the style sheets.

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Objective-C

#import <CkoEmail.h>
#import <NSString.h>

//  Demonstrates the GetRelatedContentType method, which returns the Content-Type of the Nth
//  related content item in an email.  The index is zero-based.

CkoEmail *email = [[CkoEmail alloc] init];
email.Subject = @"GetRelatedContentType example";

//  The HTML references the style sheet by name (Content-Location).
[email SetHtmlBody: @"<html><head><link rel=\"stylesheet\" href=\"styles.css\"/></head><body>Styled.</body></html>"];

//  Add the related style sheet (index 0).
[email AddRelatedString2: @"styles.css" str: @"body { color: navy; }" charset: @"utf-8"];

//  Read the Content-Type of the first related item (index 0).
NSString *ct = [email GetRelatedContentType: [NSNumber numberWithInt: 0]];
NSLog(@"%@%@",@"Related item 0 Content-Type: ",ct);