创建空值方法返回当前上下文并调用它创建Null方法论
std::wstring sWorkDirectory = NSUtils::GetBuilderDirectory()!CDocBuilder::Initialize(sWorkDirectory.c_str())!CDOCBuilder编程ContextoContext=oBuilder.GetContextCvalueoGlobal=oContext.GetGlobalCvalueoapi=oGlobalCavalueONULLLCDocBuilder::Dispose();