(Delphi DLL) Get all Tasks on a List

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

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

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

...

procedure TForm1.Button1Click(Sender: TObject);
var
fac: HCkFileAccess;
accessToken: PWideChar;
http: HCkHttp;
resp: HCkHttpResponse;
kind: PWideChar;
etag: PWideChar;
i: Integer;
count_i: Integer;
id: PWideChar;
title: PWideChar;
updated: PWideChar;
selfLink: PWideChar;
position: PWideChar;
notes: PWideChar;
status: PWideChar;
due: PWideChar;
json: HCkJsonObject;

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 := CkFileAccess_Create();
accessToken := CkFileAccess__readEntireTextFile(fac,'qa_data/tokens/googleTasks.txt','utf-8');
if (CkFileAccess_getLastMethodSuccess(fac) <> True) then
  begin
    Memo1.Lines.Add(CkFileAccess__lastErrorText(fac));
    Exit;
  end;

http := CkHttp_Create();

CkHttp_putAuthToken(http,accessToken);

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

resp := CkHttp_QuickGetObj(http,'https://www.googleapis.com/tasks/v1/lists/{$tasklist}/tasks');
if (CkHttp_getLastMethodSuccess(http) = False) then
  begin
    Memo1.Lines.Add(CkHttp__lastErrorText(http));
    Exit;
  end;

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

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

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

json := CkJsonObject_Create();
CkJsonObject_Load(json,CkHttpResponse__bodyStr(resp));

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

CkHttpResponse_Dispose(resp);

// 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

CkFileAccess_Dispose(fac);
CkHttp_Dispose(http);
CkJsonObject_Dispose(json);

end;