Lazarus Pascal
Send GMail using REST API

Demonstrates how to send an email using the GMail REST API.
Chilkat Lazarus Pascal Downloads

Lazarus Pascal
program ChilkatDemo;

// Demonstrates using the Chilkat Pascal wrapper via the C bridge DLL.
// Builds as a console application under Lazarus (FPC) or Delphi.

{$IFDEF FPC}
  {$MODE DELPHI}
{$ENDIF}
{$APPTYPE CONSOLE}

uses
  {$IFDEF UNIX}
  cthreads,
  {$ENDIF}
  SysUtils,
  CkDllLoader,
  Chilkat.Http,
  Chilkat.StringBuilder,
  Chilkat.HttpResponse,
  Chilkat.Email,
  Chilkat.JsonObject;

// ---------------------------------------------------------------------------

procedure RunDemo;
var
  success: Boolean;
  email: TEmail;
  cid: string;
  sbHtml: TStringBuilder;
  numReplacements: Integer;
  sbMime: TStringBuilder;
  json: TJsonObject;
  http: THttp;
  url: string;
  resp: THttpResponse;

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 := TEmail.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.
  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.
  cid := email.AddRelatedFile('qa_data/jpg/starfish.jpg');
  sbHtml := TStringBuilder.Create;
  sbHtml.Append('<html><body>This is a <b>test</b><br><img src="cid:STARFISH_CID"/></body></html>');
  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.
  sbMime := TStringBuilder.Create;
  email.GetMimeSb(sbMime);
  sbMime.Encode('base64url','utf-8');

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

  //  Send the email...
  http := THttp.Create;
  http.AuthToken := 'GMAIL-ACCESS-TOKEN';

  url := 'https://www.googleapis.com/gmail/v1/users/me/messages/send';
  resp := THttpResponse.Create;
  success := http.HttpJson('POST',url,json,'application/json',resp);
  if (success = False) then
    begin
      WriteLn(http.LastErrorText);
      Exit;
    end;

  //  A status code of 200 indicates success.
  WriteLn('Response status code: ' + resp.StatusCode);
  WriteLn('Response body:');
  WriteLn(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"
  //   ]
  //  }


  email.Free;
  sbHtml.Free;
  sbMime.Free;
  json.Free;
  http.Free;
  resp.Free;

end;

// ---------------------------------------------------------------------------

begin

  try
    RunDemo;
  except
    on E: Exception do
      WriteLn('Unhandled exception: ', E.ClassName, ': ', E.Message);
  end;

  WriteLn;
  {$IFDEF MSWINDOWS}
  WriteLn('Press Enter to exit...');
  ReadLn;
  {$ENDIF}
end.