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Delphi ActiveX Web API Examples

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(Delphi ActiveX) MS Graph Calendar List Events

Retrieve a list of events in a calendar. The list contains single instance meetings and series masters.

For more details, see https://docs.microsoft.com/en-us/graph/api/calendar-list-events?view=graph-rest-1.0

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_v9_5_0_TLB;

...

procedure TForm1.Button1Click(Sender: TObject);
var
http: TChilkatHttp;
jsonToken: TChilkatJsonObject;
success: Integer;
strResponse: WideString;
json: TChilkatJsonObject;
odataContext: WideString;
i: Integer;
count_i: Integer;
odataEtag: WideString;
id: WideString;
createdDateTime: WideString;
lastModifiedDateTime: WideString;
changeKey: WideString;
originalStartTimeZone: WideString;
originalEndTimeZone: WideString;
iCalUId: WideString;
reminderMinutesBeforeStart: Integer;
isReminderOn: Integer;
hasAttachments: Integer;
subject: WideString;
bodyPreview: WideString;
importance: WideString;
sensitivity: WideString;
isAllDay: Integer;
isCancelled: Integer;
isOrganizer: Integer;
responseRequested: Integer;
seriesMasterId: WideString;
showAs: WideString;
v_type: WideString;
webLink: WideString;
onlineMeetingUrl: WideString;
recurrence: WideString;
responseStatusResponse: WideString;
responseStatusTime: WideString;
bodyContentType: WideString;
bodyContent: WideString;
startDateTime: WideString;
startTimeZone: WideString;
endDateTime: WideString;
endTimeZone: WideString;
locationDisplayName: WideString;
locationLocationType: WideString;
locationUniqueId: WideString;
locationUniqueIdType: WideString;
organizerEmailAddressName: WideString;
organizerEmailAddressAddress: WideString;
j: Integer;
count_j: Integer;
displayName: WideString;
locationType: WideString;
uniqueId: WideString;
uniqueIdType: WideString;
statusResponse: WideString;
statusTime: WideString;
emailAddressName: WideString;
emailAddressAddress: WideString;

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

http := TChilkatHttp.Create(Self);

// Use your previously obtained access token as shown here:
//    Get Microsoft Graph OAuth2 Access Token with Calendars.ReadWrite scope.

jsonToken := TChilkatJsonObject.Create(Self);
success := jsonToken.LoadFile('qa_data/tokens/msGraphCalendar.json');
if (success = 0) then
  begin
    Memo1.Lines.Add(jsonToken.LastErrorText);
    Exit;
  end;
http.AuthToken := jsonToken.StringOf('access_token');

// Specify the calendar id
http.SetUrlVar('id','AQMkADAwATM0MDAAMS1iNTcwLWI2NTEtMDACLTAwCgBGAAADsVyfxjDU406Ic4X7ill8xAcA5_vF7TKKdE6bGCRqXyl2PQAAAgEGAAAA5_vF7TKKdE6bGCRqXyl2PQAClEpRTgAAAA==');
// Send a GET request to https://graph.microsoft.com/v1.0/me/calendars/{$id}/events
strResponse := http.QuickGetStr('https://graph.microsoft.com/v1.0/me/calendars/{$id}/events');
if (http.LastMethodSuccess = 0) then
  begin
    Memo1.Lines.Add(http.LastErrorText);
    Exit;
  end;

json := TChilkatJsonObject.Create(Self);
json.Load(strResponse);
json.EmitCompact := 0;

if (http.LastStatus <> 200) then
  begin
    Memo1.Lines.Add(json.Emit());
    Memo1.Lines.Add('Failed, response status code = ' + IntToStr(http.LastStatus));
    Exit;
  end;

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

// Sample output:
// (See parsing code below..)

// {
//   "@odata.context": "https://graph.microsoft.com/v1.0/$metadata#users('admin%40chilkat.io')/calendars('AQMkADAwATM0MDAAMS1i ... AClEpRTgAAAA%3D%3D')/events",
//   "value": [
//     {
//       "@odata.etag": "W/\"5+vF7TKKdE6bGCRqXyl2PQAClIgmmw==\"",
//       "id": "AQMkADAwATM0MDAAM ... AApRZ7JkAAAA=",
//       "createdDateTime": "2019-04-26T14:31:39.8791929Z",
//       "lastModifiedDateTime": "2019-04-26T14:31:41.2753537Z",
//       "changeKey": "5+vF7TKKdE6bGCRqXyl2PQAClIgmmw==",
//       "categories": [
//       ],
//       "originalStartTimeZone": "Pacific Standard Time",
//       "originalEndTimeZone": "Pacific Standard Time",
//       "iCalUId": "040000008200E ... A230FEBFE5F7486A",
//       "reminderMinutesBeforeStart": 15,
//       "isReminderOn": true,
//       "hasAttachments": false,
//       "subject": "Let's go for lunch",
//       "bodyPreview": "Does mid month work for you?",
//       "importance": "normal",
//       "sensitivity": "normal",
//       "isAllDay": false,
//       "isCancelled": false,
//       "isOrganizer": true,
//       "responseRequested": true,
//       "seriesMasterId": null,
//       "showAs": "busy",
//       "type": "singleInstance",
//       "webLink": "https://outlook.live.com/owa/?itemid=AQMkADAwATM0MDAAMS1iNTcwLWI2NT ... gkal8pdj0AApRZ7JkAAAA%3D&exvsurl=1&path=/calendar/item",
//       "onlineMeetingUrl": null,
//       "recurrence": null,
//       "responseStatus": {
//         "response": "organizer",
//         "time": "0001-01-01T00:00:00Z"
//       },
//       "body": {
//         "contentType": "html",
//         "content": "<html>\r\n<head>\r\n<meta http-equiv=\"Content-Type\" content=\"text/html; charset=utf-8\">\r\n<meta content=\"text/html; charset=us-ascii\">\r\n</head>\r\n<body>\r\nDoes mid month work for you?\r\n</body>\r\n</html>\r\n"
//       },
//       "start": {
//         "dateTime": "2019-11-15T20:00:00.0000000",
//         "timeZone": "UTC"
//       },
//       "end": {
//         "dateTime": "2019-11-15T22:00:00.0000000",
//         "timeZone": "UTC"
//       },
//       "location": {
//         "displayName": "Harry's Bar",
//         "locationType": "default",
//         "uniqueId": "Harry's Bar",
//         "uniqueIdType": "private"
//       },
//       "locations": [
//         {
//           "displayName": "Harry's Bar",
//           "locationType": "default",
//           "uniqueId": "Harry's Bar",
//           "uniqueIdType": "private"
//         }
//       ],
//       "attendees": [
//         {
//           "type": "required",
//           "status": {
//             "response": "none",
//             "time": "0001-01-01T00:00:00Z"
//           },
//           "emailAddress": {
//             "name": "Adele Vance",
//             "address": "adelev@contoso.onmicrosoft.com"
//           }
//         }
//       ],
//       "organizer": {
//         "emailAddress": {
//           "name": "Matt",
//           "address": "outlook_3A33FCEB9B74CC15@outlook.com"
//         }
//       }
//     }
//   ]
// }

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

odataContext := json.StringOf('"@odata.context"');
i := 0;
count_i := json.SizeOfArray('value');
while i < count_i do
  begin
    json.I := i;
    odataEtag := json.StringOf('value[i]."@odata.etag"');
    id := json.StringOf('value[i].id');
    createdDateTime := json.StringOf('value[i].createdDateTime');
    lastModifiedDateTime := json.StringOf('value[i].lastModifiedDateTime');
    changeKey := json.StringOf('value[i].changeKey');
    originalStartTimeZone := json.StringOf('value[i].originalStartTimeZone');
    originalEndTimeZone := json.StringOf('value[i].originalEndTimeZone');
    iCalUId := json.StringOf('value[i].iCalUId');
    reminderMinutesBeforeStart := json.IntOf('value[i].reminderMinutesBeforeStart');
    isReminderOn := json.BoolOf('value[i].isReminderOn');
    hasAttachments := json.BoolOf('value[i].hasAttachments');
    subject := json.StringOf('value[i].subject');
    bodyPreview := json.StringOf('value[i].bodyPreview');
    importance := json.StringOf('value[i].importance');
    sensitivity := json.StringOf('value[i].sensitivity');
    isAllDay := json.BoolOf('value[i].isAllDay');
    isCancelled := json.BoolOf('value[i].isCancelled');
    isOrganizer := json.BoolOf('value[i].isOrganizer');
    responseRequested := json.BoolOf('value[i].responseRequested');
    seriesMasterId := json.StringOf('value[i].seriesMasterId');
    showAs := json.StringOf('value[i].showAs');
    v_type := json.StringOf('value[i].type');
    webLink := json.StringOf('value[i].webLink');
    onlineMeetingUrl := json.StringOf('value[i].onlineMeetingUrl');
    recurrence := json.StringOf('value[i].recurrence');
    responseStatusResponse := json.StringOf('value[i].responseStatus.response');
    responseStatusTime := json.StringOf('value[i].responseStatus.time');
    bodyContentType := json.StringOf('value[i].body.contentType');
    bodyContent := json.StringOf('value[i].body.content');
    startDateTime := json.StringOf('value[i].start.dateTime');
    startTimeZone := json.StringOf('value[i].start.timeZone');
    endDateTime := json.StringOf('value[i].end.dateTime');
    endTimeZone := json.StringOf('value[i].end.timeZone');
    locationDisplayName := json.StringOf('value[i].location.displayName');
    locationLocationType := json.StringOf('value[i].location.locationType');
    locationUniqueId := json.StringOf('value[i].location.uniqueId');
    locationUniqueIdType := json.StringOf('value[i].location.uniqueIdType');
    organizerEmailAddressName := json.StringOf('value[i].organizer.emailAddress.name');
    organizerEmailAddressAddress := json.StringOf('value[i].organizer.emailAddress.address');
    j := 0;
    count_j := json.SizeOfArray('value[i].categories');
    while j < count_j do
      begin
        json.J := j;
        // ...
        j := j + 1;
      end;

    j := 0;
    count_j := json.SizeOfArray('value[i].locations');
    while j < count_j do
      begin
        json.J := j;
        displayName := json.StringOf('value[i].locations[j].displayName');
        locationType := json.StringOf('value[i].locations[j].locationType');
        uniqueId := json.StringOf('value[i].locations[j].uniqueId');
        uniqueIdType := json.StringOf('value[i].locations[j].uniqueIdType');
        j := j + 1;
      end;

    j := 0;
    count_j := json.SizeOfArray('value[i].attendees');
    while j < count_j do
      begin
        json.J := j;
        v_type := json.StringOf('value[i].attendees[j].type');
        statusResponse := json.StringOf('value[i].attendees[j].status.response');
        statusTime := json.StringOf('value[i].attendees[j].status.time');
        emailAddressName := json.StringOf('value[i].attendees[j].emailAddress.name');
        emailAddressAddress := json.StringOf('value[i].attendees[j].emailAddress.address');
        j := j + 1;
      end;

    i := i + 1;
  end;

Memo1.Lines.Add('Success.');
end;

 

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