如何使用dwscript调用CreateOleObject函数？

Question

我试图从dwscript内部执行以下代码(这是一个最小的示例，以便使用CreateOleObject)

function GetFileVersion(const FileName: string): string;
var
  V : OleVariant;
begin
  V  := CreateOleObject('Scripting.FileSystemObject');
  Result := V.GetFileVersion(FileName);
end;

到目前为止我试过这个

{$APPTYPE CONSOLE}

{$R *.res}


uses
  SysUtils,
  ComObj,
  ActiveX,
  dwsComp,
  dwsCompiler,
  dwsExprs,
  dwsCoreExprs;


procedure Execute;
var
  LScript: TDelphiWebScript;
  LUnit: TdwsUnit;
  LProg: IdwsProgram;
  LExec: IdwsProgramExecution;
begin
  LScript := TDelphiWebScript.Create(NIL);
  LUnit := TdwsUnit.Create(NIL);
  try
    LUnit.UnitName := 'Foo';
    LUnit.Script := LScript;
    //  compile a simple script
    LProg := LScript.Compile(
      'function GetFileVersion(const FileName: string): string;'+sLineBreak+
      'var'+sLineBreak+
      '   V : Variant;'+sLineBreak+
      'begin'+sLineBreak+
      ' V  := CreateOleObject(''Scripting.FileSystemObject'');'+sLineBreak+
      ' Result := V.GetFileVersion(FileName);'+sLineBreak+
      'end;'+sLineBreak+
      ''+sLineBreak+
      'PrintLn(GetFileVersion(''Foo''));'+sLineBreak+
      ''
    );

    if LProg.Msgs.HasErrors then begin
      Writeln(LProg.Msgs.AsInfo);
      Exit;
    end;

    try
      LExec := LProg.Execute;
    except
      on E: Exception do
        WriteLn(E.Message + sLineBreak + LExec.Msgs.AsInfo );
    end;
    Writeln(LExec.Result.ToString);
  finally
    LScript.Free;
  end;
end;

begin
  try
    Execute;
    Readln;
  except
    on E: Exception do
      Writeln(E.ClassName, ': ', E.Message);
  end;
end.

但我收到了这个错误信息

语法错误:未知名称"CreateOleObject“行: 5，列:8

问题是如何使用dwscript执行CreateOleObject函数？

更新

按照Linas的建议，我可以最终解决这个问题。

这是一个示例工作应用程序。

uses
  SysUtils,
  ComObj,
  ActiveX,
  dwsComp,
  dwsCompiler,
  dwsExprs,
  dwsComConnector,
  dwsCoreExprs;


procedure Execute;
var
  LScript: TDelphiWebScript;
  LUnit: TdwsUnit;
  LProg: IdwsProgram;
  LExec: IdwsProgramExecution;
  LdwsComConnector : TdwsComConnector;
begin
  LScript := TDelphiWebScript.Create(NIL);
  LdwsComConnector:=TdwsComConnector.Create(nil);
  LdwsComConnector.Script:=LScript;
  LUnit := TdwsUnit.Create(NIL);
  try
    LUnit.UnitName := 'Foo';
    LUnit.Script := LScript;
    //  compile a simple script
    LProg := LScript.Compile(
      'function GetFileVersion(const FileName: string): string;'+sLineBreak+
      'var'+sLineBreak+
      '   V : OleVariant;'+sLineBreak+
      'begin'+sLineBreak+
      ' V  := CreateOleObject(''Scripting.FileSystemObject'');'+sLineBreak+
      ' Result := VarToStr(V.GetFileVersion(FileName));'+sLineBreak+
      'end;'+sLineBreak+
      ''+sLineBreak+
      'PrintLn(GetFileVersion(''C:\Bar\Foo.exe''));'+sLineBreak+
      ''
    );

    if LProg.Msgs.HasErrors then begin
      Writeln(LProg.Msgs.AsInfo);
      Exit;
    end;

    try
      LExec := LProg.Execute;
    except
      on E: Exception do
        WriteLn(E.Message + sLineBreak + LExec.Msgs.AsInfo );
    end;
    Writeln(LExec.Result.ToString);
  finally
    LScript.Free;
    LdwsComConnector.Free;
  end;
end;

begin
 try
    CoInitialize(nil);
    try
      Execute;
      Readln;
    finally
      CoUninitialize;
    end;
 except
    on E:Exception do
        Writeln(E.Classname, ':', E.Message);
 end;
end.

Answer 1

这可以通过两种方式实现。

1 way：您必须将TdwsComConnector (从单元dwsComConnector)删除到您的数据模块或表单(或手动创建它)，并将脚本实例分配给它。例如：

dwsComConnector1.Script := LScript;

2路：

interface

uses
  dwsFunctions, dwsSymbols, dwsExprs;

type
  TCreateOleObjectFunc = class(TInternalFunction)
    procedure Execute(info : TProgramInfo); override;
  end;

implementation

uses 
  OleAuto;

{ TCreateOleObjectFunc }

procedure TCreateOleObjectFunc.Execute(info : TProgramInfo);
begin
  Info.ResultAsVariant := CreateOleObject(Info.ValueAsString['ClassName']);
end;

initialization
  RegisterInternalFunction(TCreateOleObjectFunc, 'CreateOleObject', ['ClassName', cString], cVariant, True);

这将将CreateOleObject函数公开给DWScript，以便您可以使用它。

此外，您应该将V声明为OleVariant而不是Variant，并将该行更改为Result := VarToStr(V.GetFileVersion(FileName));以使其正常工作。