Delphi DLL
Send GMail using REST API

Demonstrates how to send an email using the GMail REST API.
Chilkat Delphi DLL Downloads

Delphi DLL
uses
    Winapi.Windows, Winapi.Messages, System.SysUtils, System.Variants, System.Classes, Vcl.Graphics,
    Vcl.Controls, Vcl.Forms, Vcl.Dialogs, Vcl.StdCtrls, Http, StringBuilder, HttpResponse, Email, JsonObject;

...

procedure TForm1.Button1Click(Sender: TObject);
var
success: Boolean;
email: HCkEmail;
cid: PWideChar;
sbHtml: HCkStringBuilder;
numReplacements: Integer;
sbMime: HCkStringBuilder;
json: HCkJsonObject;
http: HCkHttp;
url: PWideChar;
resp: HCkHttpResponse;

begin
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.
email := CkEmail_Create();

// The From name/address don't need to be specified. 
// GMail will automatically use your Gmail address if the following 2 lines are omitted.
CkEmail_putFromName(email,'My Name');
CkEmail_putFromAddress(email,'my_account_name@gmail.com');

CkEmail_AddTo(email,'John Smith','somebody@somewhere.com');
// To add more recipients, make additional calls to AddTo or AddCC, one per recipient...

CkEmail_putSubject(email,'This is a test GMail email created using Chilkat.');
CkEmail_putCharset(email,'utf-8');
CkEmail_AddPlainTextAlternativeBody(email,'This is a test');

// Create an HTML email body with an embedded image.
cid := CkEmail__addRelatedFile(email,'qa_data/jpg/starfish.jpg');
sbHtml := CkStringBuilder_Create();
CkStringBuilder_Append(sbHtml,'<html><body>This is a <b>test</b><br><img src="cid:STARFISH_CID"/></body></html>');
numReplacements := CkStringBuilder_Replace(sbHtml,'STARFISH_CID',cid);

CkEmail_AddHtmlAlternativeBody(email,CkStringBuilder__getAsString(sbHtml));

// 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.
sbMime := CkStringBuilder_Create();
CkEmail_GetMimeSb(email,sbMime);
CkStringBuilder_Encode(sbMime,'base64url','utf-8');

// The body of the HTTP request will be JSON..
json := CkJsonObject_Create();
CkJsonObject_UpdateSb(json,'raw',sbMime);

// Send the email...
http := CkHttp_Create();
CkHttp_putAuthToken(http,'GMAIL-ACCESS-TOKEN');

url := 'https://www.googleapis.com/gmail/v1/users/me/messages/send';
resp := CkHttpResponse_Create();
success := CkHttp_HttpJson(http,'POST',url,json,'application/json',resp);
if (success = False) then
  begin
    Memo1.Lines.Add(CkHttp__lastErrorText(http));
    Exit;
  end;

// A status code of 200 indicates success.
Memo1.Lines.Add('Response status code: ' + IntToStr(CkHttpResponse_getStatusCode(resp)));
Memo1.Lines.Add('Response body:');
Memo1.Lines.Add(CkHttpResponse__bodyStr(resp));

// 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"
//  ]
// }

CkEmail_Dispose(email);
CkStringBuilder_Dispose(sbHtml);
CkStringBuilder_Dispose(sbMime);
CkJsonObject_Dispose(json);
CkHttp_Dispose(http);
CkHttpResponse_Dispose(resp);

end;