offset_vtbl

/*
 *  call-seq:
 *     WIN32OLE_METHOD#offset_vtbl
 * 
 *  Returns the offset ov VTBL.
 *     tobj = WIN32OLE_TYPE.new('Microsoft Excel 9.0 Object Library', 'Workbooks')
 *     method = WIN32OLE_METHOD.new(tobj, 'Add')
 *     puts method.offset_vtbl # => 40
 */
static VALUE
folemethod_offset_vtbl(self)
    VALUE self;
{
    struct olemethoddata *pmethod;
    Data_Get_Struct(self, struct olemethoddata, pmethod);
    return ole_method_offset_vtbl(pmethod->pTypeInfo, pmethod->index);
}