是否可以从 IActiveScript 调用具有可变数量参数的 Delphi 方法？

Question

我正在使用 Delphi 2006 和psvActiveScript。

例子：

unit Unit1;

interface

uses
  Windows, Messages, SysUtils, Classes, Graphics, Controls, Forms, Dialogs, StdCtrls, 
  ObjComAuto, ComObj, psvActiveScript;

type
  TForm1 = class(TForm)
    btnExecute: TButton;
    procedure btnExecuteClick(Sender: TObject);
    procedure ASWError(Sender: TObject; Line, Pos: Integer; ASrc, ADescription: String);
  end;

var
  Form1: TForm1;
  ASW: TpsvActiveScriptWindow;

implementation

{$R *.DFM}

type
  {$METHODINFO ON}
  TMySriptableClass = class(TObjectDispatch)
  public
    constructor Create;
    procedure Alert(msg: string);
    // THIS OR SOMETHING SIMILAR NOT POSSIBLE? **********************
    function FnWithVarNumOfArgs(const args: array of string): string;
    // **************************************************************
  end;
  {$METHODINFO OFF}

constructor TMySriptableClass.Create;
begin inherited Create(Self, False); end;

procedure TMySriptableClass.Alert(msg: string);
begin ShowMessage(msg); end;

function TMySriptableClass.FnWithVarNumOfArgs(const args: array of string): string;
begin Result := 'OK'; end;


procedure TForm1.btnExecuteClick(Sender: TObject);
var
  MyObj: TMySriptableClass;
begin
  ASW := TpsvActiveScriptWindow.Create(self);
  ASW.ScriptLanguage := 'JScript';
  ASW.OnError := ASWError;

  MyObj := TMySriptableClass.Create;
  ASW.AddNamedItem('MyObj', MyObj);

  try
    ASW.Execute(
      'MyObj.Alert("Warning: Here comes Error");'+
      'MyObj.FnWithVarNumOfArgs("1","2","3")'
    );
  finally
    ASW.Free;
  end;
end;

procedure TForm1.ASWError(Sender: TObject; Line, Pos: Integer; ASrc, ADescription: String);
begin Showmessage(ADescription + ': ' + ASrc); end;

end.

Answer 1

[...]
uses
  activex, objcomauto, comobj;

type
  {$METHODINFO ON}
  TMySriptableClass = class(TObjectDispatch)
  public
    [...]
    function FnWithVarNumOfArgs(const args: OleVariant): string;
    [...]


function TMySriptableClass.FnWithVarNumOfArgs(const args: OleVariant): string;
var
  dispParams: activex.DISPPARAMS;
  vtRet, Element: OleVariant;
  Enum: IEnumVARIANT;
  Fetched: LongWord;
begin
  if TVarData(args).VType = varDispatch then begin
    OleCheck(IDispatch(args).Invoke(DISPID_NEWENUM, GUID_NULL,
                                    LOCALE_USER_DEFAULT, DISPATCH_PROPERTYGET,
                                    dispParams, @vtRet, nil, nil));
    Enum := IUnknown(vtRet) as IEnumVARIANT;
    while (Enum.Next(1, Element, Fetched) = S_OK) do
      ShowMessage(Element);
  end;

  Result := 'OK';
end;


    [...]
    ASW.Execute('var myArray=["myarg1", 5, true];' +
                'MyObj.FnWithVarNumOfArgs(myArray);');
    [...]