(Delphi ActiveX) Download a Specific GMail Message into a Chilkat Email Object

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

Chilkat for Delphi Downloads Chilkat ActiveX DLL for Delphi Chilkat non-ActiveX DLL for Delphi * The examples here use the ActiveX DLL.

uses
    Winapi.Windows, Winapi.Messages, System.SysUtils, System.Variants, System.Classes, Vcl.Graphics,
    Vcl.Controls, Vcl.Forms, Vcl.Dialogs, Vcl.StdCtrls, Chilkat_TLB;

...

procedure TForm1.Button1Click(Sender: TObject);
var
success: Integer;
http: TChilkatHttp;
id: WideString;
userId: WideString;
url: WideString;
sbJson: TChilkatStringBuilder;
json: TChilkatJsonObject;
sbRaw: TChilkatStringBuilder;
email: TChilkatEmail;

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

http := TChilkatHttp.Create(Self);
http.AuthToken := 'GMAIL-ACCESS-TOKEN';

// The id of the GMail message to download.
id := '166e50fed0b9b0cb';
userId := 'me';

http.SetUrlVar('userId','me');
http.SetUrlVar('id',id);

// Fetch the email.
url := 'https://www.googleapis.com/gmail/v1/users/{$userId}/messages/{$id}?format=raw';
sbJson := TChilkatStringBuilder.Create(Self);
success := http.DownloadSb(url,'utf-8',sbJson.ControlInterface);
if (success <> 1) then
  begin
    Memo1.Lines.Add(http.LastErrorText);
    Exit;
  end;

json := TChilkatJsonObject.Create(Self);
json.LoadSb(sbJson.ControlInterface);
json.EmitCompact := 0;

if (http.LastStatus <> 200) then
  begin
    Memo1.Lines.Add(json.Emit());
    Memo1.Lines.Add('Failed.');
    Exit;
  end;

// 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..
sbRaw := TChilkatStringBuilder.Create(Self);
json.StringOfSb('raw',sbRaw.ControlInterface);
sbRaw.Decode('base64url','utf-8');

email := TChilkatEmail.Create(Self);
email.SetFromMimeSb(sbRaw.ControlInterface);

// Now we can use the email API to do whatever we desire..
Memo1.Lines.Add('From: ' + email.FromAddress);
Memo1.Lines.Add('Subject: ' + email.Subject);
// ...
end;