Pascal (Lazarus/Delphi)

Microsoft Graph -- List Users

See more Microsoft Graph Examples

Retrieve a list of Microsoft Graph user objects. 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.HttpRequest,
  Chilkat.StringBuilder,
  Chilkat.HttpResponse,
  Chilkat.JsonObject;

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

procedure RunDemo;
var
  success: Boolean;
  http: THttp;
  req: THttpRequest;
  url: string;
  resp: THttpResponse;
  statusCode: Integer;
  json: TJsonObject;
  sbResponse: TStringBuilder;
  odata_id: string;
  displayName: string;
  givenName: string;
  jobTitle: string;
  mail: string;
  mobilePhone: string;
  officeLocation: string;
  preferredLanguage: string;
  surname: string;
  userPrincipalName: string;
  id: string;
  j: Integer;
  count_j: Integer;
  odata_context: string;
  i: Integer;
  count_i: Integer;

begin
  success := False;

  //  ------------------------------------------------------------------------------------------------------
  //  See an easier way to do OAuth2 client credentials:
  //  Example using Automatic OAuth2 Client Credentials
  //  ------------------------------------------------------------------------------------------------------

  //  Get an access token with the required scope using client credentials...
  //  See How to Create Microsoft Graph App (in Azure Portal) for Client Credentials Authentication
  http := THttp.Create;
  req := THttpRequest.Create;
  req.AddParam('client_secret','CLIENT_SECRET');
  req.AddParam('client_id','CLIENT_ID');
  req.AddParam('scope','https://graph.microsoft.com/.default');
  req.AddParam('grant_type','client_credentials');

  //  Use your own tenant ID, for example 4d8fdd66-66d1-43b0-ae5c-e31b4b7de5cd
  url := 'https://login.microsoftonline.com/TENANT_ID/oauth2/v2.0/token';

  req.HttpVerb := 'POST';
  req.ContentType := 'application/x-www-form-urlencoded';

  resp := THttpResponse.Create;
  success := http.HttpReq(url,req,resp);
  if (success = False) then
    begin
      WriteLn(http.LastErrorText);
      Exit;
    end;

  statusCode := resp.StatusCode;
  WriteLn('Response status code = ' + statusCode);

  json := TJsonObject.Create;
  json.Load(resp.BodyStr);

  //  -----------------------------------------------------
  //  Use the access token obtained from above.
  //  Note: We don't need to re-fetch a new access token every time.  An access token is valid 
  //  for some amount of time, typically an hour (3600 seconds)

  //  Use your previously obtained access token here:
  http.AuthToken := json.StringOf('access_token');

  WriteLn('access token: ' + http.AuthToken);

  sbResponse := TStringBuilder.Create;

  success := http.QuickGetSb('https://graph.microsoft.com/v1.0/users',sbResponse);
  if (success = False) then
    begin
      WriteLn(http.LastErrorText);
      Exit;
    end;

  json.LoadSb(sbResponse);
  json.EmitCompact := False;

  WriteLn('Status code = ' + http.LastStatus);
  if (http.LastStatus <> 200) then
    begin
      WriteLn(json.Emit());
      WriteLn('Failed.');
    end;

  WriteLn(json.Emit());

  //  Sample output
  //  {
  //    "@odata.context": "https://graph.microsoft.com/v1.0/$metadata#users",
  //    "value": [
  //      {
  //        "@odata.id": "https://graph.microsoft.com/v2/6d8ddd66-68d1-43b0-af5c-e31b4b7dd5cd/directoryObjects/fca490d8-5918-4201-8079-c5dcbeafcdc9/Microsoft.DirectoryServices.User",
  //        "businessPhones": [
  //        ],
  //        "displayName": "Joe Sample",
  //        "givenName": "Joe",
  //        "jobTitle": null,
  //        "mail": null,
  //        "mobilePhone": null,
  //        "officeLocation": null,
  //        "preferredLanguage": null,
  //        "surname": "Sample",
  //        "userPrincipalName": "admin_chilkatsoft.com#EXT#@adminchilkatsoft.onmicrosoft.com",
  //        "id": "fca490d8-5918-4201-8079-c5dcbeafcdc9"
  //      }
  //    ]
  //  }

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

  odata_context := json.StringOf('"@odata.context"');
  i := 0;
  count_i := json.SizeOfArray('value');
  while i < count_i do
    begin
      json.I := i;
      odata_id := json.StringOf('value[i]."@odata.id"');
      displayName := json.StringOf('value[i].displayName');
      givenName := json.StringOf('value[i].givenName');
      jobTitle := json.StringOf('value[i].jobTitle');
      mail := json.StringOf('value[i].mail');
      mobilePhone := json.StringOf('value[i].mobilePhone');
      officeLocation := json.StringOf('value[i].officeLocation');
      preferredLanguage := json.StringOf('value[i].preferredLanguage');
      surname := json.StringOf('value[i].surname');
      userPrincipalName := json.StringOf('value[i].userPrincipalName');
      id := json.StringOf('value[i].id');
      j := 0;
      count_j := json.SizeOfArray('value[i].businessPhones');
      while j < count_j do
        begin
          json.J := j;
          j := j + 1;
        end;

      i := i + 1;
    end;



  http.Free;
  req.Free;
  resp.Free;
  json.Free;
  sbResponse.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.