IActiveScriptSite treats \\02 as control character when passesd as string parameter of a function while using JScript

Question

The problem I have is that IActiveScriptParse seems to behave differently in regards to string parameters of a method which shall be called via automation depending if VBScript or JScript is beeing used.

The script call is in both cases only

app.Search("tabsTAXI_TABSTRIP_OVERVIEW/tabpT\02")

In VBScript the parameter will be transmitted properly to my Search function. Whereas JScript will treat the \02 as control character, in this case STX, and thus I will not be able to find the proper control which was meant to be found.

I've created a simple MFC project with automation support following https://www.codeproject.com/Articles/8202/Adding-automation-to-MFC-applications therefore I added an Application class which shall implement a very simple interface described in the idl:

   interface IApplication : IDispatch
   {
      [id(1), helpstring("method Search")] LPDISPATCH Search(LPCTSTR Id);
   };

Mapped it to "SearchInternal"

BEGIN_DISPATCH_MAP(CApplication, CCmdTarget)
    DISP_FUNCTION_ID(CApplication, "Search", dispidSearch, SearchInternal, VT_DISPATCH, VTS_BSTR VTS_VARIANT)
END_DISPATCH_MAP()


LPDISPATCH CApplication::SearchInternal(LPCTSTR Id)
{
    CString title;
    CString output = _T("Passed Id was: \n");
    output.Append(g_strIdBeforeCall);
    output.AppendFormat(_T("\nreceived parameter Id is \n%s"), Id);

    if (g_calledByVBS)
        title = (_T("VBScriptParse"));
    else
        title = (_T("JScriptParse"));

    MessageBox(NULL, output, title, MB_OK);
    return NULL;
}

Now I try to call my method via JScript and VBScript by implementing an IActiveScriptSite. Basically like https://github.com/stephenquan/RunScriptDemo from a different stackoverflow question.

For testing purposes the script calls are initiated on a Button Click, but the behaviour is the same when it actually comes from a dropped .vbs / .jscript file.

void ChildViewButton::runScript()
{
    //get application object
    CApplication* pApp = new CApplication();


    CSimpleScriptSite* pScriptSite = new CSimpleScriptSite();
    pScriptSite->m_pUnkSessionScriptObject = pApp->GetIDispatch(FALSE);       


    // Initialize JScript
    CComPtr<IActiveScript> spJScript;
    CComPtr<IActiveScriptParse> spJScriptParse;
    HRESULT hr = spJScript.CoCreateInstance(OLESTR("JScript"));
    hr = spJScript->SetScriptSite(pScriptSite);
    spJScript->AddNamedItem(L"app", SCRIPTITEM_ISVISIBLE | SCRIPTITEM_ISSOURCE | SCRIPTITEM_GLOBALMEMBERS);
    hr = spJScript->QueryInterface(&spJScriptParse);
    hr = spJScriptParse->InitNew();


    //Initialize VBscript
    CComPtr<IActiveScript> spVBScript;
    CComPtr<IActiveScriptParse> spVBScriptParse;
    hr = spVBScript.CoCreateInstance(OLESTR("VBScript"));
    hr = spVBScript->SetScriptSite(pScriptSite);
    spVBScript->AddNamedItem(L"app", SCRIPTITEM_ISVISIBLE | SCRIPTITEM_ISSOURCE | SCRIPTITEM_GLOBALMEMBERS);
    hr = spVBScript->QueryInterface(&spVBScriptParse);
    hr = spVBScriptParse->InitNew();



    // Run some scripts
    g_strIdBeforeCall = _T("app.Search(\"tabsTAXI_TABSTRIP_OVERVIEW/tabpT\\02\")");
    _bstr_t strCodeBstr = bstr_t(g_strIdBeforeCall);

    //check CApplication::SearchInternal
    g_calledByVBS = true;
    testScript(L"VBScript", spVBScriptParse, strCodeBstr);
    g_calledByVBS = false;
    testScript(L"JScript", spJScriptParse, strCodeBstr);



    // Cleanup
    spVBScriptParse = NULL;
    spVBScript = NULL;
    spJScriptParse = NULL;
    spJScript = NULL;
    pScriptSite->Release();
    pScriptSite = NULL;
}

With TestScript() beeing:

void testScript(const wchar_t* prefix, IActiveScriptParse* pScriptParse, LPCOLESTR script)
{
    wprintf(L"%s: %s\n", prefix, script);
    HRESULT hr = S_OK;
    CComVariant result;
    EXCEPINFO ei = { };
    hr = pScriptParse->ParseScriptText(script, NULL, NULL, NULL, 0, 0, 0, &result, &ei);
}

Results in:

JScript treats \02 as control character \x2 == STX Do you have any suggestions if I might miss something here or is this an API Bug? Unfortunately we cannot change our indexing system \02, \03, \04... and I also do not know how to solve this problem once I reached SearchInternal() as there could by any number of calls to Search in one script with different indexes in the same format.