Pascal (Lazarus/Delphi)

Refinitiv World-Check One - Get Top Level Groups

See more Refinitiv Examples

Sends a signed GET request to get the top level groups.

Note: This example requires Chilkat v9.5.0.89 or later.

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.JsonArray,
  Chilkat.JsonObject;

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

procedure RunDemo;
var
  success: Boolean;
  json: TJsonObject;
  http: THttp;
  responseJson: string;
  jarr: TJsonArray;
  jsonObj: TJsonObject;
  id: string;
  name: string;
  parentId: string;
  hasChildren: Boolean;
  status: string;
  j: Integer;
  count_j: Integer;
  i: Integer;
  count_i: Integer;

begin
  success := False;

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

  json := TJsonObject.Create;

  //  Create the following JSON:
  //  
  //  {
  //    "keyId": "aaaaaaa-bbbb-cccc-dddd-eeeeeeeeeeee",
  //    "hmacKey": "xxxxzI3vi58xxxCBxxx1+P/d8tGxx7KuLqN/KMPNxxxxekhj8/bx83+1YQSUxxxxYyv939ceY06GvhYRKmxxxx==",
  //    "algorithm": "hmac-sha256",
  //    "headers": [
  //      "(request-target)",
  //      "host",
  //      "date"
  //    ]
  //  }

  //  Substitute your actual API key and API secret in place of "api-key" and "api-secret"
  json.UpdateString('keyId','api-key');
  json.UpdateString('hmacKey','api-secret');
  json.UpdateString('algorithm','hmac-sha256');
  //  Indicate the names of the headers to be included in the signature.
  //  "(request-target)" is not actually a header name, but is a special name for HTTP signatures.
  //  Copy the following three lines of code exactly as-is.  
  //  Do not replace "host", "date", or "(request-target)" with values.
  json.UpdateString('headers[0]','(request-target)');
  json.UpdateString('headers[1]','host');
  json.UpdateString('headers[2]','date');

  http := THttp.Create;

  //  Setting the AuthSignature property causes the following header to be computed and added:
  //  Authorization: Signature keyId="...", algorithm="hmac-sha256", headers="(request-target) host date", signature="..."
  http.AuthSignature := json.Emit();

  http.SetRequestHeader('Cache-Control','no-cache');

  //  Chilkat will auto-add the Date header because it's needed by the HTTP Signature.

  responseJson := http.QuickGetStr('https://api-worldcheck.refinitiv.com/v2/groups');
  if (http.LastMethodSuccess = False) then
    begin
      WriteLn(http.LastErrorText);
      Exit;
    end;

  WriteLn(responseJson);
  WriteLn('----');
  //  A 200 status code indicates success.
  WriteLn('Status code = ' + http.LastStatus);

  //  Successful JSON looks like this:
  //  [ 
  //    {
  //    "id": "...",
  //    "name": "Company Name",
  //    "parentId": null,
  //    "hasChildren": false,
  //    "status": "ACTIVE",
  //    "children": []
  //    }
  //  ]

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

  jarr := TJsonArray.Create;

  success := jarr.Load(responseJson);

  i := 0;
  count_i := jarr.Size;
  while i < count_i do
    begin
      jsonObj := jarr.ObjectAt(i);
      id := jsonObj.StringOf('id');
      name := jsonObj.StringOf('name');
      parentId := jsonObj.StringOf('parentId');
      hasChildren := jsonObj.BoolOf('hasChildren');
      status := jsonObj.StringOf('status');
      j := 0;
      count_j := jsonObj.SizeOfArray('children');
      while j < count_j do
        begin
          jsonObj.J := j;
          j := j + 1;
        end;

      jsonObj.Free;
      i := i + 1;
    end;



  json.Free;
  http.Free;
  jarr.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.