FILEIDX.H

//-------------------------------------------------------------------- 
// Microsoft OLE DB Sample Provider 
// (C) Copyright 1994 - 1996 Microsoft Corporation.  All Rights Reserved. 
// 
// @doc 
// 
// @module FILEIDX.H | Class Definitions for CFileIdx Class 
// 
// 
#ifndef _FILEIDX_H_ 
#define _FILEIDX_H_ 
#include <windows.h> 
 
//-------------------------------------------------------------------- 
// @struct FILEDEX | Simple structure used to maintain file offset and 
// deletion status for the rows. 
// 
typedef struct { 
ULONGulOffset;//@field Offset into file 
BYTEbStatus;//@field Deletion Status 
} FILEDEX, FAR * LPFILEDEX; 
 
 
//-------------------------------------------------------------------- 
// @class CFileIdx | Manages the array of offsets into a file.  This  
// maintains whether the row has been deleted and where the row begins. 
//  
// @hungarian  
// 
class CFileIdx 
{ 
private: //@access private 
//@cmember Array of Offset and Status flags 
LPFILEDEXm_rgDex; 
//@cmember Current number of rows allocated  
ULONGm_ulDexCnt; 
//@cmember Reallocation Routine 
BOOL ReAlloc(ULONG ulRows); 
 
public: //@access public 
//@cmember Class Constructor 
CFileIdx(void);  
//@cmember Class Destructor 
~CFileIdx(void); 
//@cmember Initialization Routine 
BOOL fInit(void); 
//@cmember Sets file offset of a particular index 
BOOL SetIndex(ULONG ulDex,ULONG ulOffset); 
//@cmember Sets the delete flag for a particular row 
BOOL DeleteRow(ULONG ulDex); 
//@cmember Has the Row been deleted 
BOOL IsDeleted(ULONG ulDex); 
//@cmember Returns the offset in the file for a particular row 
ULONG GetRowOffset(ULONG ulDex); 
}; 
 
 
#endif