var ctrl = m_Map.GetCtrlMan();
var ctrlstate = ctrl.GetControlState();

var zoomscale = ctrlstate.GetZoomScale();
alert(zoomscale);

#include "CXCtrlMan.h"
#include "CXControlState.h"

CXCtrlMan ctrlman = m_Map.GetCtrlMan();
CXControlState ctrlstate = ctrlman.GetControlState();

double dZoomScale = ctrlstate.GetZoomScale();
CString str;
str.Format(_T("Current ZoomScale : %f"), dZoom);
AfxMessageBox(str);