Objective-C

Add a Related Item from a BinData Object

Demonstrates the Chilkat Email.AddRelatedBd method, which adds a related item (such as an inline image) using the contents of a BinData object, and returns the generated Content-ID. This example loads an image into a BinData, adds it, captures the Content-ID, and references it from the HTML body.

Background: This is the binary, Content-ID-based way to embed an inline resource — the right choice for images, whose bytes belong in a BinData rather than a string. Because Chilkat generates the Content-ID, the usual pattern is: add the item first, capture the returned ID, then build the matching <img src="cid:..."> reference from it (done here with a StringBuilder).

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Objective-C

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

BOOL success = NO;

//  Demonstrates the AddRelatedBd method, which adds a related item (such as an inline image)
//  using the contents of a BinData object, and returns the generated Content-ID.

CkoEmail *email = [[CkoEmail alloc] init];
email.Subject = @"Related image from BinData";

//  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; capture its generated Content-ID.
NSString *cid = [email AddRelatedBd: @"logo.png" binData: bdImage];
if (email.LastMethodSuccess == NO) {
    NSLog(@"%@",email.LastErrorText);
    return true;
}

//  Reference the related item in the HTML body by its Content-ID.
CkoStringBuilder *sbHtml = [[CkoStringBuilder alloc] init];
[sbHtml Append: @"<html><body><img src=\"cid:PLACEHOLDER_CID\"/></body></html>"];
int numReplaced = [[sbHtml Replace: @"PLACEHOLDER_CID" replacement: cid] intValue];
[email SetHtmlBody: [sbHtml GetAsString]];

NSLog(@"%@%d",@"NumRelatedItems = ",[email.NumRelatedItems intValue]);

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