(Objective-C) Download a Specific GMail Message into a Chilkat Email Object

Demonstrates how to download a GMail message into a Chilkat Email object.

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

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

BOOL success;

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

// The id of the GMail message to download.
NSString *id = @"166e50fed0b9b0cb";
NSString *userId = @"me";

[http SetUrlVar: @"userId" value: @"me"];
[http SetUrlVar: @"id" value: id];

// Fetch the email.
NSString *url = @"https://www.googleapis.com/gmail/v1/users/{$userId}/messages/{$id}?format=raw";
CkoStringBuilder *sbJson = [[CkoStringBuilder alloc] init];
success = [http DownloadSb: url charset: @"utf-8" sb: sbJson];
if (success != YES) {
    NSLog(@"%@",http.LastErrorText);
    return;
}

CkoJsonObject *json = [[CkoJsonObject alloc] init];
[json LoadSb: sbJson];
json.EmitCompact = NO;

if ([http.LastStatus intValue] != 200) {
    NSLog(@"%@",[json Emit]);
    NSLog(@"%@",@"Failed.");
    return;
}

// The returned JSON contains something like this:

// {
//   "id": "166e50fed0b9b0cb",
//   "threadId": "166e50fed0b9b0cb",
//   "labelIds": [
//     "CATEGORY_SOCIAL",
//     "INBOX"
//   ],
//   "snippet": "...",
//   "historyId": "582477",
//   "internalDate": "1541441317000",
//   "sizeEstimate": 28603,
//   "raw": "BASE64URL_CONTENT"
// }

// The RFC822 MIME of the email is contained in the "raw" as a base64URL encoded string.
// Let's decode and load into a Chilkat email object..
CkoStringBuilder *sbRaw = [[CkoStringBuilder alloc] init];
[json StringOfSb: @"raw" sb: sbRaw];
[sbRaw Decode: @"base64url" charset: @"utf-8"];

CkoEmail *email = [[CkoEmail alloc] init];
[email SetFromMimeSb: sbRaw];

// Now we can use the email API to do whatever we desire..
NSLog(@"%@%@",@"From: ",email.FromAddress);
NSLog(@"%@%@",@"Subject: ",email.Subject);
// ...