Delphi ActiveX

JSON: Access Array Values

See more JSON Examples

Demonstrates how to access values in a JSON array. Delphi ActiveX

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;
tagsArray: IChilkatJsonArray;
arraySize: Integer;
i: Integer;
sValue: WideString;
iValue: Integer;

begin
success := 0;

json := TChilkatJsonObject.Create(Self);

jsonStr := '{ "id": 1, "name": "A green door", "tags": ["home", 22, "green"], "price": 125 }';

success := json.Load(jsonStr);
if (success <> 1) then
  begin
    Memo1.Lines.Add(json.LastErrorText);
    Exit;
  end;

// Get the "tags" array, which contains "home", 22, "green"
tagsArray := json.ArrayOf('tags');
if (json.LastMethodSuccess = 0) then
  begin
    Memo1.Lines.Add('tags member not found.');
    Exit;
  end;

// Get the value at each array index. 
// Output will be:
// [0] = home
// [0] as integer = 0
// [1] = 22
// [1] as integer = 22
// [2] = green
// [2] as integer = 0

arraySize := tagsArray.Size;

for i := 0 to arraySize - 1 do
  begin

    sValue := tagsArray.StringAt(i);

    Memo1.Lines.Add('[' + IntToStr(i) + '] = ' + sValue);

    iValue := tagsArray.IntAt(i);
    Memo1.Lines.Add('[' + IntToStr(i) + '] as integer = ' + IntToStr(iValue));

  end;

// Note: The StringAt method returns the value as a string regardless of the type.

// The IntAt method returns the value as an integer.  If the value does not convert to 
// an integer, then 0 is returned
end;