[MSCE C++]请问如何给元素添加外部文件links

如下MSCE C++代码测试通过（为简单起见，未增加任何多余的容错代码）：

	ElementHandle eh(2656L, ACTIVEMODEL);
	DgnLinkTreeSpecPtr spec = DgnLinkManager::CreateTreeSpec(eh);
	DgnLinkTreePtr linkTree = DgnLinkManager::ReadLinkTree(*spec, true);
	DgnLinkTreeBranchR root = linkTree->GetRootR();

	StatusInt status;
	auto leaf = DgnLinkManager::CreateLink(status, DGNLINK_TYPEKEY_File);
	DgnDocumentMonikerPtr moniker = DgnDocumentMoniker::CreateFromFileName(L"C:\\111\\test.dgn");
	DgnLinkP link = leaf->GetLinkP();
	DgnFileLinkP fileLink = dynamic_cast<DgnFileLinkP>(link);
	fileLink->SetMoniker(moniker.get(), true);

	WString name = link->BuildSuggestedName(&root, true);
	WString uniqueName = root.GetUniqueChildName(name.GetWCharCP());
	leaf->SetName(uniqueName.GetWCharCP());
	
	root.AddChild(*leaf, 0);
	DgnLinkManager::WriteLinkTree(*linkTree);

非常非常感谢

非常非常感谢