Can not Get the name of TDF_Label object by OCAF

hi, every one, I Ihave some questions to ask you guys! I use OCAF to read Igs File, some problem occured when i get the name of TDF_Label. if aLabel is not Assembly,the name can Get correctly, if aLabel is subLabel, the name get is display like "=>[0:1:1:5]", so I am confused, hope someone can help me,Thanks in advance! here the code and igs file attachment as follow:

BOOL REx3dDoc::ReadIgs(LPCTSTR lpszFile)

{

USES_CONVERSION;

Standard_CString strFileName = T2A(lpszFile);

 

IGESCAFControl_Reader Reader; 

IFSelect_ReturnStatus readstatus = Reader.ReadFile(strFileName); 

if (readstatus != IFSelect_RetDone) {

return FALSE;

}

 

//transfer doc

if (!Reader.Transfer(m_myStdDoc)) {

return FALSE;

} 

 

//Get Shape Tool

m_myAssembly = XCAFDoc_DocumentTool::ShapeTool(m_myStdDoc->Main());

 

TDF_LabelSequence labels;

m_myAssembly->GetShapes(labels);

 

Standard_Integer iLen = labels.Length();

 

for (Standard_Integer i=1; i<=iLen; i++)

{

TDF_Label aLabel = labels.Value(i);

CollectShapeInfo(aLabel);

}

}

 

 

 

 

void REx3dDoc::CollectShapeInfo(TDF_Label aLabel)

{

if (m_myAssembly->IsAssembly(aLabel))

{

TDF_LabelSequence subLabels;

m_myAssembly->GetComponents(aLabel, subLabels);

int iLen = subLabels.Length();

for (Standard_Integer i=1; i<=iLen; i++)

{

    TDF_Label subLabel = subLabels.Value(i);

    CollectShapeInfo(subLabel);

}

}

else

{

//Get label name

Handle(TDataStd_Name) N;

if (!aLabel.FindAttribute(TDataStd_Name::GetID(), N)){

return;

}

TCollection_ExtendedString name = N->Get();

//if aLabel is not Assembly,the name can Get correct, if aLabel is subLabel, the name is display like "=>[0:1:1:5]", i am so confused.

CString sName = name.ToWideString();

        }

}