(Objective-C) Send HTML Email with CSS as Related Item using Content-Location

Demonstrates how to compose an HTML email with an external CSS file included as a related item and referenced by Content-Location.

Some email clients display embedded (related) content best using CID's (Content-IDs), whereas other email clients display related content best by Content-Location. The choice you make may depend on the software used by the intended recipient of your email. (Does' the recipient read email on an iPhone? Android? Outlook? GMail? Thunderbird? etc.)

Chilkat Objective-C Library Downloads

MAC OS X (Cocoa) Libs

iOS Libs

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

// This example requires the Chilkat API to have been previously unlocked.
// See Global Unlock Sample for sample code.

// The mailman object is used for sending and receiving email.
CkoMailMan *mailman = [[CkoMailMan alloc] init];

// Use your SMTP server hostname.  This example uses office365, but it could be any SMTP server..
mailman.SmtpHost = @"outlook.office365.com";
mailman.SmtpPort = [NSNumber numberWithInt:587];
mailman.StartTLS = YES;

// Set the SMTP login/password
mailman.SmtpUsername = @"OFFICE365-SMTP-LOGIN";
mailman.SmtpPassword = @"OFFICE365-SMTP-PASSWORD";

// Create a new email object
CkoEmail *email = [[CkoEmail alloc] init];
email.Subject = @"HTML Email with embedded CSS";
email.From = @"Chilkat Support <my-office365-user@mydomain.com>";
[email AddTo: @"Chilkat Support" emailAddress: @"support@chilkatsoft.com"];

CkoStringBuilder *sbCss = [[CkoStringBuilder alloc] init];
BOOL bCrlf = YES;
[sbCss AppendLine: @"body {" crlf: bCrlf];
[sbCss AppendLine: @"    background-color: powderblue;" crlf: bCrlf];
[sbCss AppendLine: @"}" crlf: bCrlf];
[sbCss AppendLine: @"h1 {" crlf: bCrlf];
[sbCss AppendLine: @"    color: blue;" crlf: bCrlf];
[sbCss AppendLine: @"}" crlf: bCrlf];
[sbCss AppendLine: @"p {" crlf: bCrlf];
[sbCss AppendLine: @"    color: red;" crlf: bCrlf];
[sbCss AppendLine: @"}" crlf: bCrlf];

// The filenameInHtml is what should exists within the HTML (in the href atribute)
NSString *filenameInHtml = @"styles.css";
// Call AddRelatedString2 to use Content-Location.
[email AddRelatedString2: filenameInHtml str: [sbCss GetAsString] charset: @"utf-8"];

CkoStringBuilder *sbHtml = [[CkoStringBuilder alloc] init];
[sbHtml AppendLine: @"<!DOCTYPE html>" crlf: bCrlf];
[sbHtml AppendLine: @"<html>" crlf: bCrlf];
[sbHtml AppendLine: @"<head>" crlf: bCrlf];
[sbHtml AppendLine: @"  <link rel=\"stylesheet\" href=\"styles.css\">" crlf: bCrlf];
[sbHtml AppendLine: @"</head>" crlf: bCrlf];
[sbHtml AppendLine: @"<body>" crlf: bCrlf];
[sbHtml AppendLine: @"" crlf: bCrlf];
[sbHtml AppendLine: @"<h1>This is a heading</h1>" crlf: bCrlf];
[sbHtml AppendLine: @"<p>This is a paragraph.</p>" crlf: bCrlf];
[sbHtml AppendLine: @"" crlf: bCrlf];
[sbHtml AppendLine: @"</body>" crlf: bCrlf];
[sbHtml AppendLine: @"</html>" crlf: bCrlf];

[email SetHtmlBody: [sbHtml GetAsString]];

BOOL success = [mailman SendEmail: email];
if (success != YES) {
    NSLog(@"%@",mailman.LastErrorText);
}
else {
    NSLog(@"%@",@"Mail Sent!");
}