I created a class. Here it is, pretty simple and easy-to-understand:

#if !defined(AFX_NODE_H__C69D4DE3_E295_11D5_8A89_444553540000__INCLUDED_)
#define AFX_NODE_H__C69D4DE3_E295_11D5_8A89_444553540000__INCLUDED_

#if _MSC_VER > 1000
#pragma once
#endif // _MSC_VER > 1000

class CNode  : public CObArray
{
private:
	CNode *pChild;
	CNode *pParent;
	int ObjectID;
public:
	CNode() : pChild(NULL), pParent(NULL) {}
	void Attach(CNode *pChild);
	void AttachTo(CNode *pParent);

	// Internal add node/remove node for this object
	void AddNode (CNode *newNode);
	bool RemoveNode (CNode *remNode);
	void RemoveNode (int ObjectId);
	int GetNodeIndex (int ObjectId);
	CNode *FindNode (int ObjectId);

	virtual ~CNode();

};

#endif // !defined(AFX_NODE_H__C69D4DE3_E295_11D5_8A89_444553540000__INCLUDED_)
 

What it gives me is an error saying that CObArray is undefined base class.

error C2504: ''CObArray'' : base class undefined
 

I tried to include afxcoll.h, but it gives me error that _WINDOWS_ is already included.

fatal error C1189: #error :  WINDOWS.H already included.  MFC apps must not #include 
 

How do I use that CObArray class to declare class CNode : public CObArray ? Thanks.