(Delphi DLL) Insert a New Google Calendar Event

See more Google Calendar Examples

Demonstrates how to insert a new Google Calendar event.

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, HttpResponse, JsonObject;

...

procedure TForm1.Button1Click(Sender: TObject);
var
jsonToken: HCkJsonObject;
success: Boolean;
http: HCkHttp;
json: HCkJsonObject;
url: PWideChar;
resp: HCkHttpResponse;
jsonResp: HCkJsonObject;

begin
// 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 := CkJsonObject_Create();
success := CkJsonObject_LoadFile(jsonToken,'qa_data/tokens/googleCalendar.json');
if (CkJsonObject_HasMember(jsonToken,'access_token') = False) then
  begin
    Memo1.Lines.Add('No access token found.');
    Exit;
  end;
http := CkHttp_Create();
CkHttp_putAuthToken(http,CkJsonObject__stringOf(jsonToken,'access_token'));

// Build a Google Calendar event:
json := CkJsonObject_Create();
CkJsonObject_putEmitCompact(json,False);
CkJsonObject_UpdateString(json,'kind','calendar#event');
CkJsonObject_UpdateString(json,'summary','Eat Lou Malnati''s Pizza');
CkJsonObject_UpdateString(json,'start.dateTime','2021-03-12T12:00:00-05:00');
CkJsonObject_UpdateString(json,'end.dateTime','2021-03-12T13:00:00-05:00');

Memo1.Lines.Add(CkJsonObject__emit(json));

// This is the event JSON we'll be sending the HTTP POST:

// {
//   "kind": "calendar#event",
//   "summary": "Eat Lou Malnati's Pizza",
//   "start": {
//     "dateTime": "2021-03-12T12:00:00-05:00"
//   },
//   "end": {
//     "dateTime": "2021-03-12T13:00:00-05:00"
//   }
// }

url := 'https://www.googleapis.com/calendar/v3/calendars/{$calendarId}/events';
CkHttp_SetUrlVar(http,'calendarId','primary');
resp := CkHttp_PostJson3(http,url,'application/json',json);
if (CkHttp_getLastMethodSuccess(http) = False) then
  begin
    Memo1.Lines.Add(CkHttp__lastErrorText(http));
    Exit;
  end;

jsonResp := CkJsonObject_Create();
CkJsonObject_putEmitCompact(jsonResp,False);
CkJsonObject_Load(jsonResp,CkHttpResponse__bodyStr(resp));

if (CkHttpResponse_getStatusCode(resp) = 200) then
  begin
    // Success.
    // The newly created event resource JSON is returned.
    Memo1.Lines.Add(CkJsonObject__emit(jsonResp));
  end
else
  begin
    if (CkHttpResponse_getStatusCode(resp) = 401) then
      begin
        Memo1.Lines.Add('Try refreshing the access token and then retry...');
      end;

    // Failed. 
    // Show the JSON error response.
    Memo1.Lines.Add(CkJsonObject__emit(jsonResp));
  end;

CkHttpResponse_Dispose(resp);

// A successful response body:

// {
//   "kind": "calendar#event",
//   "etag": "\"3004969011208000\"",
//   "id": "v7kvmsvsoms3hjl5uq423jqhb0",
//   "status": "confirmed",
//   "htmlLink": "https://www.google.com/calendar/event?eid=djdrdm1zdnNvbXMzaGpsNXVxNDIzanFoYjAgc3VwcG9ydEBjaGlsa2F0Y2xvdWQuY29t",
//   "created": "2017-08-11T20:48:25.000Z",
//   "updated": "2017-08-11T20:48:25.604Z",
//   "summary": "Eat Lou Malnati's Pizza",
//   "creator": {
//     "email": "support@chilkatcloud.com",
//     "self": true
//   },
//   "organizer": {
//     "email": "support@chilkatcloud.com",
//     "self": true
//   },
//   "start": {
//     "dateTime": "2017-08-12T12:00:00-05:00"
//   },
//   "end": {
//     "dateTime": "2017-08-12T13:00:00-05:00"
//   },
//   "iCalUID": "v7kvmsvsoms3hjl5uq423jqhb0@google.com",
//   "sequence": 0,
//   "hangoutLink": "https://plus.google.com/hangouts/_/chilkatcloud.com/support?hceid=c3VwcG9ydEBjaGlsa2F0Y2xvdWQuY29t.v7kvmsvsoms3hjl5uq423jqhb0",
//   "reminders": {
//     "useDefault": true
//   }
// }

CkJsonObject_Dispose(jsonToken);
CkHttp_Dispose(http);
CkJsonObject_Dispose(json);
CkJsonObject_Dispose(jsonResp);

end;