Objective-C

Get the Content-Location of a Related Item

Demonstrates the Chilkat Email.GetRelatedContentLocation method, which returns the Content-Location of a related item (typically an image or style sheet embedded within an HTML email). The index is zero-based. This example loads an image from a file into a BinData object and adds it as a related item addressed by Content-Location using AddRelatedBd2, then reads it back.

Background: Content-Location is the alternative to Content-ID for linking HTML to its embedded resources. Instead of a cid: reference, the HTML keeps an ordinary-looking src="logo.png", and the matching part carries a Content-Location of logo.png. Since the image is binary, it is loaded into a BinData object and added with AddRelatedBd2. This approach is common when an existing web page is turned into an email, since the original relative URLs can stay unchanged.

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Objective-C

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

BOOL success = NO;

//  Demonstrates the GetRelatedContentLocation method, which returns the Content-Location of
//  a related item.  Related items are typically images and style sheets embedded within
//  HTML emails.  The index is zero-based.

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

//  The HTML references the image by the same name used as the Content-Location.
[email SetHtmlBody: @"<html><body><img src=\"logo.png\"/></body></html>"];

//  Load the image data from a file into a BinData object.
CkoBinData *bdImage = [[CkoBinData alloc] init];
success = [bdImage LoadFile: @"qa_data/images/logo.png"];
if (success == NO) {
    NSLog(@"%@",bdImage.LastErrorText);
    return true;
}

//  Add the image as a related item addressed by Content-Location "logo.png".
success = [email AddRelatedBd2: bdImage fileNameInHtml: @"logo.png"];
if (success == NO) {
    NSLog(@"%@",email.LastErrorText);
    return true;
}

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

//  Note: The path "qa_data/images/logo.png" is a relative local filesystem path,
//  relative to the current working directory of the running application.