(Delphi ActiveX) JSON: Nested Objects

Here we have a JSON object that contains nested JSON objects. This example demonstrates how to access the contents of the nested objects.

{
  "name": "donut",
  "image":
    {
    "fname": "donut.jpg",
    "w": 200,
    "h": 200
    },
  "thumbnail":
    {
    "fname": "donutThumb.jpg",
    "w": 32,
    "h": 32
    }
}

Note: This example requires Chilkat v11.0.0 or greater.

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_TLB;

...

procedure TForm1.Button1Click(Sender: TObject);
var
success: Integer;
json: TChilkatJsonObject;
jsonStr: WideString;
imageObj: TChilkatJsonObject;
thumbObj: TChilkatJsonObject;

begin
success := 0;

json := TChilkatJsonObject.Create(Self);

// This is the above JSON with whitespace chars removed (SPACE, TAB, CR, and LF chars).
// The presence of whitespace chars for pretty-printing makes no difference to the Load
// method. 
jsonStr := '{"name": "donut","image":{"fname": "donut.jpg","w": 200,"h": 200},"thumbnail":{"fname": "donutThumb.jpg","w": 32,"h": 32}}';

success := json.Load(jsonStr);
if (success = 0) then
  begin
    Memo1.Lines.Add(json.LastErrorText);
    Exit;
  end;

// Get the "image" object.
imageObj := TChilkatJsonObject.Create(Self);
json.ObjectOf2('image',imageObj.ControlInterface);

Memo1.Lines.Add('image: fname=' + imageObj.StringOf('fname') + ', width=' + IntToStr(imageObj.IntOf('w')) + ', height='
     + IntToStr(imageObj.IntOf('h')));

// Get the "thumbnail" object.
thumbObj := TChilkatJsonObject.Create(Self);
json.ObjectOf2('thumbnail',thumbObj.ControlInterface);

Memo1.Lines.Add('thumbnail: fname=' + thumbObj.StringOf('fname') + ', width=' + IntToStr(thumbObj.IntOf('w')) + ', height='
     + IntToStr(thumbObj.IntOf('h')));
end;