btnode.h

来自「有计算机图形学、图像处理、dbms、sniffer、中游俄罗斯外挂、othell」· C头文件 代码 · 共 60 行

// BTNODE.h: interface for the BTNODE class.
//
//////////////////////////////////////////////////////////////////////

#if !defined(AFX_BTNODE_H__BD234231_727E_49B8_9819_658CFF47AFFE__INCLUDED_)
#define AFX_BTNODE_H__BD234231_727E_49B8_9819_658CFF47AFFE__INCLUDED_

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

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

#include "KEY.h"
#include "DEF.h"
#define RIGHT 0
#define LEFT 1

class BTNODE  
{
public:
	BYTE tag;//tag=0非终端
	BYTE rtag:4,wtag:4;
	PDB DB_THIS;
    unsigned short keynum;
	
	PDB parent;
	
    KEY *key;//KEY key[M+1];//0号单元要用,多一个单元防止溢出
	union _pointer 
	{
		PDB *ptr;
		//BTNODE **ptr;//BTNODE *ptr[M+2];//0号单元要用,多一个单元防止溢出
		
		struct _address1 
        {
			PDB *recptr;
			//int *recptr;//int recptr[M+1];//1.临时认为是int型 ; 2.0号单元要用,多一个单元防止溢出
			PDB left;
		    PDB right;
		}address1;
		
	}pointer;
	
public:
	WORD KeyLength;
	BTNODE();
	BTNODE(BOOL t,unsigned short m,BYTE KeyType,WORD KeyLength);
	BTNODE(PDB db_addr,BYTE *buf,unsigned short m,BYTE KeyType,WORD KeyLength);
	BTNODE *ReadChild(const CFile &f, unsigned int pos,unsigned short m);
	BTNODE *ReadBrother(const CFile &f,BOOL type,unsigned short m);//读出的brother的parent=NULL
	BOOL WriteDisk();
	virtual ~BTNODE();

};

#endif // !defined(AFX_BTNODE_H__BD234231_727E_49B8_9819_658CFF47AFFE__INCLUDED_)