【ORD C++】XAttribute问题

Question

My_elementRef 是当前model中选中的参考文件的元素，写XAttribute失败了，返回值是-105。但是如果将参考文件合并到主文件，就会写入成功。请问是什么原因呢？ 
 
 ElementRefP My_elementRef = mdlDisplayPath_getElem(path, mdlDisplayPath_getCursorIndex((DisplayPathP)path));
ElementID elID = My_elementRef->GetElementId();
EditElementHandle eeh(elID, ACTIVEMODEL); //添加attribute的元素
...
...
...
XAttributeHandlerId xAttHandlerId(234, 567);

UInt32 xAttId = 101;

XAttributeHandle xAttHandle(eeh.GetElementRef(), xAttHandlerId, xAttId);
StatusInt iRet = -1;
if (xAttHandle.m_node.m_xattr == NULL)
{
//直接存
iRet = ITxnManager::GetCurrentTxn().AddXAttribute(eeh.GetElementRef(), xAttHandlerId, xAttId, pdata, size);
// eeh.ScheduleWriteXAttribute(xAttHandlerId, xAttId, size, pdata);
}

Xiang Liu · Accepted Answer

多谢张老师的指导，根据张老师提供的代码和其他帖子做的了以下总结： 
 写参考文件元素属性时，不能直接通过当前DGN中所选中的参考文件中元素的elementRefP来构造XAttributeHandle,这样写不成功，现已成功的一种方式如下，需记录选中的元素ID即ElementID,并重新打开参考文件进行编辑并加载选中元素所在model，且通过ElementRefP elRefP = pModel->FindElementByID(elmID) 来获取elRefP,通过该elRefP来构造 XAttributeHandle，这样才能写成功，代码如下： 
 ElementRefP elRefP = mdlDisplayPath_getElem(path, mdlDisplayPath_getCursorIndex((DisplayPathP)path));
ElementId elmID = elRefP->GetElementId();
WString filepath = elRefP->GetDgnModelP()->GetDgnFileP()->GetDocumentPtr()->GetFileName();
DgnDocumentPtr pDgnDoc = DgnDocument::CreateForLocalFile(filepath.GetWCharCP());
DgnFilePtr file = DgnFile::Create(*pDgnDoc, DgnFileOpenMode::ReadWrite);
StatusInt openForWriteStatus;
file->LoadDgnFile(&openForWriteStatus);
if (!file->IsOpen())
{
 mdlDialog_dmsgsPrint(L"The file can't be written");
 return;
}

file->FillDictionaryModel();

DgnModelPtr pModel = file->LoadModelById(elRefP->GetDgnModelP()->GetModelId());
file->FillSectionsInModel(pModel.get());

if (pModel != NULL)
{
 // 获取参考文件中的元素对象
 elRefP = pModel->FindElementByID(elmID);
}

//存储的key值
XAttributeHandlerId xAttHandlerId(234, 567);
UInt32 xAttId = 101;
XAttributeHandle xAttHandle(elRefP, xAttHandlerId, xAttId);
StatusInt iRet = -1;
if (xAttHandle.m_node.m_xattr == NULL)
{
 //直接存
 iRet = ITxnManager::GetCurrentTxn().AddXAttribute(elRefP, xAttHandlerId, xAttId, pdata, size);
}
else
{
 //删除再存
 ITxnManager::GetCurrentTxn().DeleteXAttribute(xAttHandle);
 ITxnManager::GetCurrentTxn().AddXAttribute(elRefP, xAttHandlerId, xAttId, pdata, size);
}
file->ProcessChanges(DgnSaveReason::FileClose); 
 参考帖子： 
 https://communities.bentley.com/communities/other_communities/chinafirst/f/microstation-projectwise/188733/ms-v8i-c

【ORD C++】XAttribute问题

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