OpenCASCADE 讀寫STEP檔案

1、讀step檔案

IFSelect_ReturnStatus ReadSTEP(
	const Standard_CString& aFileName/*讀取檔案的路徑*/,
	Handle(TopTools_HSequenceOfShape)& aHSequenceOfShape/*儲存讀取到的三維模型*/)
{
 	 aHSequenceOfShape->Clear();
 	 //讀取step檔案并傳回讀取狀态
  	 STEPControl_Reader aReader;
 	 IFSelect_ReturnStatus status = aReader.ReadFile(aFileName);
 	 if (status != IFSelect_RetDone)
   	 return status;
 	 //設定錯誤追蹤等級
  	 aReader.WS()->TransferReader()->TransientProcess()->SetTraceLevel(2); 
	  Standard_Boolean failsonly = Standard_False;
	  //檢查檔案加載狀态
	  aReader.PrintCheckLoad(failsonly, IFSelect_ItemsByEntity);
	
	  // 轉換step檔案模型
	  Standard_Integer nbr = aReader.NbRootsForTransfer();
	  aReader.PrintCheckTransfer (failsonly, IFSelect_ItemsByEntity);
	  for ( Standard_Integer n = 1; n<=nbr; n++) 
	  {
	    /*Standard_Boolean ok =*/ aReader.TransferRoot(n);
	  }
	
	  //讀取到的模型數量
	  Standard_Integer nbs = aReader.NbShapes();
	  if (nbs == 0)
	   {
	    return IFSelect_RetVoid;
	  }
	  // 儲存讀取到的模型
	  for (Standard_Integer i=1; i<=nbs; i++) 
	  {
	    aHSequenceOfShape->Append(aReader.Shape(i));
	  }
	
	  return status;
}

           

2、寫step檔案

IFSelect_ReturnStatus SaveSTEP(
	const Standard_CString& aFileName/*儲存檔案的路徑*/,
	const Handle(TopTools_HSequenceOfShape)& aHSequenceOfShape/*待儲存的模型*/,
	const STEPControl_StepModelType aValue /* 儲存的狀态成功與否 */ )
{
    STEPControl_Writer aWriter;
	IFSelect_ReturnStatus status;
	for (Standard_Integer i=1;i<=aHSequenceOfShape->Length();i++)  
    {
    	//轉換三維模型到aWriter
		status =  aWriter.Transfer(aHSequenceOfShape->Value(i), aValue);
    	if ( status != IFSelect_RetDone )
    	 return status;
    }     
    //儲存資料到磁盤
    status = aWriter.Write(aFileName);
    return status;
}