Send GMail using REST API

Demonstrates how to send an email using the GMail REST API.
Chilkat C# Downloads

bool success = false;

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

// Use the Chilkat Email API to create or load an email.
Chilkat.Email email = new Chilkat.Email();

// 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","somebody@somewhere.com");
// To add more recipients, make additional calls to AddTo or AddCC, one per recipient...

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.
string cid = email.AddRelatedFile("qa_data/jpg/starfish.jpg");
Chilkat.StringBuilder sbHtml = new Chilkat.StringBuilder();
sbHtml.Append("<html><body>This is a <b>test</b><br><img src=\"cid:STARFISH_CID\"/></body></html>");
int numReplacements = sbHtml.Replace("STARFISH_CID",cid);

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.
Chilkat.StringBuilder sbMime = new Chilkat.StringBuilder();
email.GetMimeSb(sbMime);
sbMime.Encode("base64url","utf-8");

// The body of the HTTP request will be JSON..
Chilkat.JsonObject json = new Chilkat.JsonObject();
json.UpdateSb("raw",sbMime);

// Send the email...
Chilkat.Http http = new Chilkat.Http();
http.AuthToken = "GMAIL-ACCESS-TOKEN";

string url = "https://www.googleapis.com/gmail/v1/users/me/messages/send";
Chilkat.HttpResponse resp = new Chilkat.HttpResponse();
success = http.HttpJson("POST",url,json,"application/json",resp);
if (success == false) {
    Debug.WriteLine(http.LastErrorText);
    return;
}

// A status code of 200 indicates success.
Debug.WriteLine("Response status code: " + Convert.ToString(resp.StatusCode));
Debug.WriteLine("Response body:");
Debug.WriteLine(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"
//  ]
// }