Program running error : CArray

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C++

MFC

I faced some strange things is that I used CArray as a container for some custom class object. as the nbegining the program works well, CArray can operate .

but I don't know when I run the program after a while (maybe half hours, during that time I was writing some other custom class ) CArray blow up. it did not report error, but it blows up when program is running. it can not return its size, can not add element, can not do anything.

codes as blow.

#include "Afxtempl.h"
#include "Feature.h"
#include "BatchProcess.h"

class CFeatureSet					
{
public:
	CVector GetVector(int index);
	int GetFeatureVectorCount();
	CString ShowVectore();
	void GenerateFeatureVector();
	void Add(BatchProcess  * m_batch);
	CTraitCollection* GetTraitByIndex(int i);
	int GetFeatureCount();
	
	CFeatureSet();
	virtual ~CFeatureSet();
	
private:
	void Add(CTraitCollection* m_trait);
	CTraitCollection * m_Ptrait;					//Á´±íÖд洢
	CTraitCollection * m_pLastTrait;	

	CArray<ctraitcollection ctraitcollection=""> m_Traitarry;	   };
</ctraitcollection>

//it blows up here when program is running(at both)
m_Traitarry.Add(m_trait);
return m_Traitarry.GetSize();

class definition is:

#include "Feature.h"
#include "Afxtempl.h"
class CTraitCollection  
{
public:
	CString GetWpString(int index);
	int CalcDelayStrokePos(int index);
	int GetDelayStrokeCountofWp(int index);
	void Draw(CDC* pDC);
	CTraitCollection();
	virtual ~CTraitCollection();

	CFeature * GetFeatureByindex(int index);
	int GetFeatureNum();
	CString ShowData();
	void LoadFeature(DeSerializer * _Deserializer);
	void Clear();
	void GetWordInfo(CString HandString, short m_line,CRect _WRect);
	CString m_handstring;				
	short  m_baseline;							
	CRect m_WordRect;										 
	short m_wpCount;                       CMap<int,int,cstring,cstring>;m_WpUnicode; 	
void AddFeature(CFeature * m_Feature);
	
	CFeature* m_pFeature;
	CFeature* m_pLastFeature;
	
	CTraitCollection * m_PnextTrait;
};

when I replaced CArray with CMap , there is still same problem. when program runs it blows up at any operation of CMap.
is there anyone experienced that same problem before ? or is there anyone who could tell me why and how fix that problem?