Pascal (Lazarus/Delphi)

JSON Iterate Members

See more JSON Examples

Demonstrates how to loop over the immediate members of a JSON object. 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.JsonObject;

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

procedure RunDemo;
var
  success: Boolean;
  json: TJsonObject;
  jsonStr: string;
  numMembers: Integer;
  i: Integer;
  name: string;
  value: string;
  iValue: Integer;

begin
  success := False;

  json := TJsonObject.Create;

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

  success := json.Load(jsonStr);
  if (success <> True) then
    begin
      WriteLn(json.LastErrorText);
      Exit;
    end;

  numMembers := json.Size;

  for i := 0 to numMembers - 1 do
    begin

      name := json.NameAt(i);
      value := json.StringAt(i);

      WriteLn(name + ': ' + value);

      iValue := json.IntAt(i);
      WriteLn(name + ' as integer: ' + iValue);

    end;

  //  Note: The StringAt method returns the value as a string regardless of the type.
  //  If the value is a JSON array (such as for ["home", "green"]), then the JSON encoding
  //  of the entire array is returned.

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


  json.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.