(Delphi ActiveX) Get all Tasks on a List

Demonstrates how to get all the tasks in a Google task list.

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
fac: TCkFileAccess;
accessToken: WideString;
http: TChilkatHttp;
resp: IChilkatHttpResponse;
kind: WideString;
etag: WideString;
i: Integer;
count_i: Integer;
id: WideString;
title: WideString;
updated: WideString;
selfLink: WideString;
position: WideString;
notes: WideString;
status: WideString;
due: WideString;
json: TChilkatJsonObject;

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

// Get the previously obtained access token.
// See Get Google Tasks Access Token.

fac := TCkFileAccess.Create(Self);
accessToken := fac.ReadEntireTextFile('qa_data/tokens/googleTasks.txt','utf-8');
if (fac.LastMethodSuccess <> 1) then
  begin
    Memo1.Lines.Add(fac.LastErrorText);
    Exit;
  end;

http := TChilkatHttp.Create(Self);

http.AuthToken := accessToken;

// Get the tasks from the task list w/ id = MDM4MzQ4NTA3NDQwMDUxMzQ2OTQ6NzAwOTA4MDA1NzU2ODYwMzow
http.SetUrlVar('tasklist','MDM4MzQ4NTA3NDQwMDUxMzQ2OTQ6NzAwOTA4MDA1NzU2ODYwMzow');

resp := http.QuickGetObj('https://www.googleapis.com/tasks/v1/lists/{$tasklist}/tasks');
if (http.LastMethodSuccess = 0) then
  begin
    Memo1.Lines.Add(http.LastErrorText);
    Exit;
  end;

// Show the response body.
Memo1.Lines.Add(resp.BodyStr);

// Examine the response status code.
Memo1.Lines.Add('response status code: ' + IntToStr(resp.StatusCode));

// Use this online tool to generate parsing code from sample JSON: 
// Generate Parsing Code from JSON

json := TChilkatJsonObject.Create(Self);
json.Load(resp.BodyStr);

kind := json.StringOf('kind');
etag := json.StringOf('etag');
i := 0;
count_i := json.SizeOfArray('items');
while i < count_i do
  begin
    json.I := i;
    kind := json.StringOf('items[i].kind');
    id := json.StringOf('items[i].id');
    etag := json.StringOf('items[i].etag');
    title := json.StringOf('items[i].title');
    updated := json.StringOf('items[i].updated');
    selfLink := json.StringOf('items[i].selfLink');
    position := json.StringOf('items[i].position');
    notes := json.StringOf('items[i].notes');
    status := json.StringOf('items[i].status');
    due := json.StringOf('items[i].due');
    i := i + 1;
  end;

// Sample response:

// {
//  "kind": "tasks#tasks",
//  "etag": "\"84_7Cubo3y98GMV9bE3zQclHxhc/LTM3Njg4MjgyNA\"",
//  "items": [
//   {
//    "kind": "tasks#task",
//    "id": "MDM4MzQ4NTA3NDQwMDUxMzQ2OTQ6NzAwOTA4MDA1NzU2ODYwMzoyMDg3OTcyMDA1MTQ5NTA0",
//    "etag": "\"84_7Cubo3y98GMV9bE3zQclHxhc/NjcyMTU4Mg\"",
//    "title": "Get haircut",
//    "updated": "2019-04-04T18:07:58.000Z",
//    "selfLink": "https://www.googleapis.com/tasks/v1/lists/MDM4MzQ4NTA3NDQwMDUxMzQ2OTQ6NzAwOTA4MDA1NzU2ODYwMzow/tasks/MDM4MzQ4NTA3NDQwMDUxMzQ2OTQ6NzAwOTA4MDA1NzU2ODYwMzoyMDg3OTcyMDA1MTQ5NTA0",
//    "position": "00000000001610612734",
//    "notes": "Check in online first.",
//    "status": "needsAction",
//    "due": "2019-04-07T00:00:00.000Z"
//   },
//   {
//    "kind": "tasks#task",
//    "id": "MDM4MzQ4NTA3NDQwMDUxMzQ2OTQ6NzAwOTA4MDA1NzU2ODYwMzoxMTg0MzQxMTkzMjM2MDY1",
//    "etag": "\"84_7Cubo3y98GMV9bE3zQclHxhc/MTU1MjQzNDIwMQ\"",
//    "title": "Go to grocery store",
//    "updated": "2019-04-04T17:59:15.000Z",
//    "selfLink": "https://www.googleapis.com/tasks/v1/lists/MDM4MzQ4NTA3NDQwMDUxMzQ2OTQ6NzAwOTA4MDA1NzU2ODYwMzow/tasks/MDM4MzQ4NTA3NDQwMDUxMzQ2OTQ6NzAwOTA4MDA1NzU2ODYwMzoxMTg0MzQxMTkzMjM2MDY1",
//    "position": "00000000002147483647",
//    "notes": "Don't forget to buy apples.",
//    "status": "needsAction",
//    "due": "2019-04-07T00:00:00.000Z"
//   }
//  ]
// }
// 
// response status code: 200
end;