(Delphi ActiveX) Append New Item to JSON Array

Demonstrates the notations that can be used in a JSON array index to append to the end of an array.

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
json: TChilkatJsonObject;

begin
// Starting in Chilkat v9.5.0.77, the following notations are possible to specify that the value
// should be appended to the end of the array. (In other words, if the array currenty has N elements, then "-1", "", or "*" 
// indicate an index of N+1.

json := TChilkatJsonObject.Create(Self);

json.UpdateInt('lanes[-1]',0);
json.UpdateInt('lanes[]',1);
json.UpdateInt('lanes[*]',2);
json.UpdateInt('lanes[-1]',3);

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

// Output is:  {"lanes":[0,1,2,3]}
end;