Delphi DLL

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.

Delphi DLL

uses
    Winapi.Windows, Winapi.Messages, System.SysUtils, System.Variants, System.Classes, Vcl.Graphics,
    Vcl.Controls, Vcl.Forms, Vcl.Dialogs, Vcl.StdCtrls, Http, JsonArray, JsonObject;

...

procedure TForm1.Button1Click(Sender: TObject);
var
success: Boolean;
json: HCkJsonObject;
http: HCkHttp;
responseJson: PWideChar;
jarr: HCkJsonArray;
jsonObj: HCkJsonObject;
id: PWideChar;
name: PWideChar;
parentId: PWideChar;
hasChildren: Boolean;
status: PWideChar;
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 := CkJsonObject_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"
CkJsonObject_UpdateString(json,'keyId','api-key');
CkJsonObject_UpdateString(json,'hmacKey','api-secret');
CkJsonObject_UpdateString(json,'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.
CkJsonObject_UpdateString(json,'headers[0]','(request-target)');
CkJsonObject_UpdateString(json,'headers[1]','host');
CkJsonObject_UpdateString(json,'headers[2]','date');

http := CkHttp_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="..."
CkHttp_putAuthSignature(http,CkJsonObject__emit(json));

CkHttp_SetRequestHeader(http,'Cache-Control','no-cache');

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

responseJson := CkHttp__quickGetStr(http,'https://api-worldcheck.refinitiv.com/v2/groups');
if (CkHttp_getLastMethodSuccess(http) = False) then
  begin
    Memo1.Lines.Add(CkHttp__lastErrorText(http));
    Exit;
  end;

Memo1.Lines.Add(responseJson);
Memo1.Lines.Add('----');
// A 200 status code indicates success.
Memo1.Lines.Add('Status code = ' + IntToStr(CkHttp_getLastStatus(http)));

// 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 := CkJsonArray_Create();

success := CkJsonArray_Load(jarr,responseJson);

i := 0;
count_i := CkJsonArray_getSize(jarr);
while i < count_i do
  begin
    jsonObj := CkJsonArray_ObjectAt(jarr,i);
    id := CkJsonObject__stringOf(jsonObj,'id');
    name := CkJsonObject__stringOf(jsonObj,'name');
    parentId := CkJsonObject__stringOf(jsonObj,'parentId');
    hasChildren := CkJsonObject_BoolOf(jsonObj,'hasChildren');
    status := CkJsonObject__stringOf(jsonObj,'status');
    j := 0;
    count_j := CkJsonObject_SizeOfArray(jsonObj,'children');
    while j < count_j do
      begin
        CkJsonObject_putJ(jsonObj,j);
        j := j + 1;
      end;

    CkJsonObject_Dispose(jsonObj);
    i := i + 1;
  end;

CkJsonObject_Dispose(json);
CkHttp_Dispose(http);
CkJsonArray_Dispose(jarr);

end;