(Objective-C) Send GMail with BCC Recipients using REST API

See more GMail REST API Examples

Demonstrates how to send an email with BCC recipients using the GMail REST API.

Note: This example requires Chilkat v9.5.0.91 or greater.

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#import <CkoEmail.h>
#import <NSString.h>
#import <CkoStringBuilder.h>
#import <CkoJsonObject.h>
#import <CkoHttp.h>
#import <CkoHttpResponse.h>

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

BOOL success;

// Use the Chilkat Email API to create or load an email.
CkoEmail *email = [[CkoEmail alloc] init];

// The From name/address don't need to be specified. 
// GMail will automatically use your Gmail address if the following 2 lines are omitted.
email.FromName = @"My Name";
email.FromAddress = @"my_account_name@gmail.com";

[email AddTo: @"John Smith" emailAddress: @"somebody@somewhere.com"];
// To add more recipients, make additional calls to AddTo or AddCC, one per recipient...

// -----------------------------------------------------------------------------------------
// This section of this example demonstrates how to add BCC recipients.
// 
// Technically, an email should never contain a "Bcc" MIME header because it would
// effectively nullify the purpose of BCC -- which means "Blind Carbon Copy".
// Email recipients should not be able to see the BCC recipients.
// Chilkat never adds a "Bcc" header field.
// However.. in this case, the GMail REST server will look for the Bcc header field,
// and will include those email addresses when sending, and also removes the Bcc header
// from the email that is sent.
// 
// Starting in Chilkat v9.5.0.91, we can tell the email object to add the Bcc header
// using the "UseBccHeader" UncommonOptions.  For example:
email.UncommonOptions = @"UseBccHeader";
[email AddBcc: @"Joe" emailAddress: @"joe@example.com"];
[email AddBcc: @"Dave" emailAddress: @"dave@example.com"];
// ...
// -----------------------------------------------------------------------------------------

email.Subject = @"This is a test GMail email created using Chilkat.";
email.Charset = @"utf-8";
[email AddPlainTextAlternativeBody: @"This is a test"];

// Create an HTML email body with an embedded image.
NSString *cid = [email AddRelatedFile: @"qa_data/jpg/starfish.jpg"];
CkoStringBuilder *sbHtml = [[CkoStringBuilder alloc] init];
[sbHtml Append: @"<html><body>This is a <b>test</b><br><img src=\"cid:STARFISH_CID\"/></body></html>"];
int numReplacements = [[sbHtml Replace: @"STARFISH_CID" replacement: cid] intValue];

[email AddHtmlAlternativeBody: [sbHtml GetAsString]];

// OK.. we now have an HTML email with an embedded JPG image
// We'll need to get the full MIME of the email encoded to a base64url string.
CkoStringBuilder *sbMime = [[CkoStringBuilder alloc] init];
[email GetMimeSb: sbMime];
[sbMime Encode: @"base64url" charset: @"utf-8"];

// The body of the HTTP request will be JSON..
CkoJsonObject *json = [[CkoJsonObject alloc] init];
[json UpdateSb: @"raw" sb: sbMime];

// Send the email...
CkoHttp *http = [[CkoHttp alloc] init];
http.AuthToken = @"GMAIL-ACCESS-TOKEN";

NSString *url = @"https://www.googleapis.com/gmail/v1/users/me/messages/send";
CkoHttpResponse *resp = [http PostJson3: url contentType: @"application/json" json: json];
if (http.LastMethodSuccess != YES) {
    NSLog(@"%@",http.LastErrorText);
    return;
}

// A status code of 200 indicates success.
NSLog(@"%@%d",@"Response status code: ",[resp.StatusCode intValue]);
NSLog(@"%@",@"Response body:");
NSLog(@"%@",resp.BodyStr);

// The response body contains JSON.
// Use the online tool at Generate JSON Parsing Code
// to generate JSON parsing code.

// A sample successful JSON response:

// {
//  "id": "166f0d4ac39e50bf",
//  "threadId": "166f0d4ac39e50bf",
//  "labelIds": [
//   "SENT"
//  ]
// }