Pascal (Lazarus/Delphi)

List Google Calendars

See more Google Calendar Examples

Demonstrates how to list the Google Calendars for an account. 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.JsonObject,
  Chilkat.Http;

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

procedure RunDemo;
var
  success: Boolean;
  jsonToken: TJsonObject;
  http: THttp;
  jsonResponse: string;
  json: TJsonObject;
  numCalendars: Integer;
  i: Integer;
  numSettings: Integer;
  j: Integer;

begin
  success := False;

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

  //  This example uses a previously obtained access token having permission for the 
  //  Google Calendar scope.

  //  In this example, Get Google Calendar OAuth2 Access Token, the access
  //  token was saved to a JSON file.  This example fetches the access token from the file..
  jsonToken := TJsonObject.Create;
  success := jsonToken.LoadFile('qa_data/tokens/googleCalendar.json');
  if (jsonToken.HasMember('access_token') = False) then
    begin
      WriteLn('No access token found.');
      Exit;
    end;
  http := THttp.Create;
  http.AuthToken := jsonToken.StringOf('access_token');

  jsonResponse := http.QuickGetStr('https://www.googleapis.com/calendar/v3/users/me/calendarList');
  if (http.LastMethodSuccess <> True) then
    begin
      WriteLn(http.LastErrorText);
      Exit;
    end;

  WriteLn(jsonResponse);
  WriteLn('-----------------------------');

  //  This is a sample JSON response:
  //  (Sample code to iterate over the JSON response is shown below.)

  //  {
  //   "kind": "calendar#calendarList",
  //   "etag": "\"p32cfpufit76da0g\"",
  //   "nextSyncToken": "CJj8-fLpzNUCEhhzdXBwb3J0QGNoaWxrYXRjbG91ZC5jb20=",
  //   "items": [
  //    {
  //     "kind": "calendar#calendarListEntry",
  //     "etag": "\"1465249947472000\"",
  //     "id": "support@chilkatcloud.com",
  //     "summary": "support@chilkatcloud.com",
  //     "timeZone": "America/Chicago",
  //     "colorId": "14",
  //     "backgroundColor": "#9fe1e7",
  //     "foregroundColor": "#000000",
  //     "selected": true,
  //     "accessRole": "owner",
  //     "defaultReminders": [
  //      {
  //       "method": "popup",
  //       "minutes": 10
  //      }
  //     ],
  //     "notificationSettings": {
  //      "notifications": [
  //       {
  //        "type": "eventCreation",
  //        "method": "email"
  //       },
  //       {
  //        "type": "eventChange",
  //        "method": "email"
  //       },
  //       {
  //        "type": "eventCancellation",
  //        "method": "email"
  //       },
  //       {
  //        "type": "eventResponse",
  //        "method": "email"
  //       }
  //      ]
  //     },
  //     "primary": true
  //    },
  //    {
  //     "kind": "calendar#calendarListEntry",
  //     "etag": "\"1502373382732000\"",
  //     "id": "#contacts@group.v.calendar.google.com",
  //     "summary": "Contacts",
  //     "timeZone": "America/Chicago",
  //     "colorId": "13",
  //     "backgroundColor": "#92e1c0",
  //     "foregroundColor": "#000000",
  //     "selected": true,
  //     "accessRole": "reader",
  //     "defaultReminders": []
  //    },
  //    {
  //     "kind": "calendar#calendarListEntry",
  //     "etag": "\"1502373376447000\"",
  //     "id": "en.usa#holiday@group.v.calendar.google.com",
  //     "summary": "Holidays in United States",
  //     "timeZone": "America/Chicago",
  //     "colorId": "8",
  //     "backgroundColor": "#16a765",
  //     "foregroundColor": "#000000",
  //     "selected": true,
  //     "accessRole": "reader",
  //     "defaultReminders": []
  //    }
  //   ]
  //  }
  //  

  //  Iterate over the JSON response..
  json := TJsonObject.Create;
  json.Load(jsonResponse);

  numCalendars := json.SizeOfArray('items');
  i := 0;
  while i < numCalendars do
    begin
      WriteLn('--- ' + i + ' ---');
      json.I := i;
      WriteLn('kind: ' + json.StringOf('items[i].kind'));
      WriteLn('id: ' + json.StringOf('items[i].id'));

      //  Examine the notification settings, if any..
      numSettings := json.SizeOfArray('items[i].notificationSettings.notifications');
      if (numSettings > 0) then
        begin
          j := 0;
          while j < numSettings do
            begin
              json.J := j;
              WriteLn('Notification Type: ' + json.StringOf('items[i].notificationSettings.notifications[j].type'));
              WriteLn('Notification Method: ' + json.StringOf('items[i].notificationSettings.notifications[j].method'));
              j := j + 1;
            end;

        end;
      i := i + 1;
    end;



  jsonToken.Free;
  http.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.