Pascal (Lazarus/Delphi)

Get all Tasks on a List

See more Google Tasks Examples

Demonstrates how to get all the tasks in a Google task list. Pascal (Lazarus/Delphi)

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.FileAccess,
  Chilkat.HttpResponse,
  Chilkat.JsonObject;

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

procedure RunDemo;
var
  success: Boolean;
  fac: TFileAccess;
  accessToken: string;
  http: THttp;
  resp: THttpResponse;
  kind: string;
  etag: string;
  i: Integer;
  count_i: Integer;
  id: string;
  title: string;
  updated: string;
  selfLink: string;
  position: string;
  notes: string;
  status: string;
  due: string;
  json: TJsonObject;

begin
  success := False;

  //  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 := TFileAccess.Create;
  accessToken := fac.ReadEntireTextFile('qa_data/tokens/googleTasks.txt','utf-8');
  if (fac.LastMethodSuccess = False) then
    begin
      WriteLn(fac.LastErrorText);
      Exit;
    end;

  http := THttp.Create;

  http.AuthToken := accessToken;

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

  resp := THttpResponse.Create;
  success := http.HttpNoBody('GET','https://www.googleapis.com/tasks/v1/lists/{$tasklist}/tasks',resp);
  if (success = False) then
    begin
      WriteLn(http.LastErrorText);
      Exit;
    end;

  //  Show the response body.
  WriteLn(resp.BodyStr);

  //  Examine the response status code.
  WriteLn('response status code: ' + resp.StatusCode);

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

  json := TJsonObject.Create;
  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


  fac.Free;
  http.Free;
  resp.Free;
  json.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.