Pascal (Lazarus/Delphi)

Create a JSON Array of Objects

See more JSON Examples

Demonstrates how to create a JSON array of objects. Pascal (Lazarus/Delphi)

program ChilkatDemo;

// Demonstrates using the Chilkat Pascal wrapper via the C bridge DLL.
// Builds as a console application under Lazarus (FPC) or Delphi.

{$IFDEF FPC}
  {$MODE DELPHI}
{$ENDIF}
{$APPTYPE CONSOLE}

uses
  {$IFDEF UNIX}
  cthreads,
  {$ENDIF}
  SysUtils,
  CkDllLoader,
  Chilkat.JsonArray,
  Chilkat.JsonObject;

// ---------------------------------------------------------------------------

procedure RunDemo;
var
  success: Boolean;
  arr: TJsonArray;
  obj: TJsonObject;

begin
  success := False;

  arr := TJsonArray.Create;

  obj := TJsonObject.Create;

  //  Create a new and empty JSON object in the 1st position of the JSON array 
  //  and return the reference in the last argument.
  arr.AddObjectAt2(0,obj);
  obj.UpdateString('Name','Otto');
  obj.UpdateInt('Age',29);
  obj.UpdateBool('Married',False);

  //  Create a new and empty JSON object in the 2nd position of the JSON array 
  //  and return the reference in the last argument.
  arr.AddObjectAt2(1,obj);
  obj.UpdateString('Name','Connor');
  obj.UpdateInt('Age',43);
  obj.UpdateBool('Married',True);

  //  Create a new and empty JSON object in the 3rd position of the JSON array 
  //  and return the reference in the last argument.
  arr.AddObjectAt2(2,obj);
  obj.UpdateString('Name','Ramona');
  obj.UpdateInt('Age',34);
  obj.UpdateBool('Married',True);

  //  Examine what we have:
  arr.EmitCompact := False;
  WriteLn(arr.Emit());

  //  The output is:

  //  [
  //    {
  //      "Name": "Otto",
  //      "Age": 29,
  //      "Married": false
  //    },
  //    {
  //      "Name": "Connor",
  //      "Age": 43,
  //      "Married": true
  //    },
  //    {
  //      "Name": "Ramona",
  //      "Age": 34,
  //      "Married": true
  //    }
  //  ]


  arr.Free;
  obj.Free;

end;

// ---------------------------------------------------------------------------

begin

  try
    RunDemo;
  except
    on E: Exception do
      WriteLn('Unhandled exception: ', E.ClassName, ': ', E.Message);
  end;

  WriteLn;
  {$IFDEF MSWINDOWS}
  WriteLn('Press Enter to exit...');
  ReadLn;
  {$ENDIF}
end.