从AcDbObjectPointer派生的可以打开锁定图层实体的模板类

#pragma once
#include “dbobjptr.h”
template<class T_OBJECT>
class AcDbEntityPointerEx:public AcDbObjectPointer<T_OBJECT>
{
public:
AcDbEntityPointerEx(AcDbObjectId objId,
AcDb::OpenMode mode,
bool openErased = false,
bool openOnLockLayer=false);
public:
~AcDbEntityPointerEx(void);
protected:
bool m_bLock;//图层是否锁定
bool m_bFrozen;//图层是否冻结
AcDbObjectId m_layerId;//图层ID
};
template<class T_OBJECT>
AcDbEntityPointerEx<T_OBJECT>::AcDbEntityPointerEx(AcDbObjectId objId,
AcDb::OpenMode mode,
bool openErased = false,
bool openOnLockLayer=false):AcDbObjectPointer(objId,mode,openErased)
{
if(m_status==Acad::eOnLockedLayer&&mode==AcDb::kForWrite)
{
m_status=acdbOpenObject(m_ptr, objId, AcDb::kForRead, openErased);
if(m_status!=Acad::eOk)
{
return;
}
m_layerId=m_ptr->layerId();
AcDbLayerTableRecordPointer spLayer(m_layerId,AcDb::kForWrite);
if(spLayer.openStatus()!=Acad::eOk)
{
//如果解锁图层失败
//获取到了实体也无法操作
m_ptr->close();
m_ptr=NULL;
m_status=spLayer.openStatus();
return;
}
m_bLock=spLayer->isLocked();
m_bFrozen=spLayer->isFrozen();
spLayer->setIsLocked(false);
spLayer->setIsFrozen(false);
m_status=m_ptr->upgradeOpen();
if(m_status!=Acad::eOk)
{
//如果解锁图层失败
//获取到了实体也无法操作
m_ptr->close();
m_ptr=NULL;
return;
}
}
else
{
m_bLock=false;
m_bFrozen=false;
m_layerId.setNull();
}
}
template<class T_OBJECT>
AcDbEntityPointerEx<T_OBJECT>::~AcDbEntityPointerEx()
{
if(!m_layerId.isValid())
return;
AcDbLayerTableRecordPointer spLayer(m_layerId,AcDb::kForWrite);
if(spLayer.openStatus()!=Acad::eOk)
{
return;
}
spLayer->setIsLocked(m_bLock);
spLayer->setIsFrozen(m_bFrozen);

}