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Delphi ActiveX Examples


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(Delphi ActiveX) Get the Root of a JSON Document

Demonstrates how to get back to the JSON root object from anywhere in the JSON document. This example uses the following JSON document:

{
  "flower": "tulip",
  "abc":
    {
    "x": [
       { "a" : 1 },
       { "b1" : 100, "b2" : 200 },
       { "c" : 3 }
    ],
    "y": 200,
    "z": 200
    }
}

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_v9_5_0_TLB;

...

procedure TForm1.Button1Click(Sender: TObject);
var
json: TChilkatJsonObject;
jsonStr: WideString;
success: Integer;
abcObj: IChilkatJsonObject;
xArray: IChilkatJsonArray;
bObj: IChilkatJsonObject;
docRoot: IChilkatJsonObject;

begin
json := TChilkatJsonObject.Create(Self);

jsonStr := '{"flower": "tulip","abc":{"x": [{ "a" : 1 },{ "b1" : 100, "b2" : 200 },{ "c" : 3 }],"y": 200,"z": 200}}';

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

//  Get the "abc" object.
abcObj := json.ObjectOf('abc');
if (abcObj = nil ) then
  begin
    Memo1.Lines.Add('abc object not found.');
    Exit;
  end;

//  Side note: The JSON of a sub-part of the document can be emitted from any JSON object:
abcObj.EmitCompact := 0;
Memo1.Lines.Add(abcObj.Emit());

//  Navigate to the "x" array
xArray := abcObj.ArrayOf('x');
//  We'll skip the null check and assume it's non-null...

//  Navigate to the 2nd object contained within the array.  This contains members b1 and b2
bObj := xArray.ObjectAt(1);
//  We'll skip the null check and assume it's non-null...

//  Show that we're at "b1/b2".
//  The value of "b1" should be "200"
Memo1.Lines.Add('b2 = ' + IntToStr(bObj.IntOf('b2')));

//  Now go back to the JSON doc root:
docRoot := bObj.GetDocRoot();
//  We'll skip the null check and assume it's non-null...

//  Pretty-print the JSON doc from the root to show that this is indeed the root.
docRoot.EmitCompact := 0;
Memo1.Lines.Add(docRoot.Emit());
end;

 

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