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57 lines
1.2 KiB
C++
57 lines
1.2 KiB
C++
/////////////////////////////////////////////////////////////////////////////
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//主要功能:
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// SegY读写类
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//
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//程序编写: 2008-11-09
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//
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//
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/////////////////////////////////////////////////////////////////////////////
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#pragma once
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#include "filesegy.h"
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#include ".\filemapping.h"
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namespace NFile64
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{
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class CFileSegyMapping :
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public CFileSegy
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{
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public:
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CFileSegyMapping(void);
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virtual ~CFileSegyMapping(void);
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virtual BOOL Open(LPCTSTR lpFileName);
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virtual __int64 Seek(__int64 offset, int origin);
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virtual UINT Read(void* lpBuf, UINT nCount);
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virtual void Close(void);
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virtual BOOL IsOpen(void);
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BOOL IsMappingOpen(void);
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BOOL IsRemapping(ULONGLONG offset);
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CFileMapping* GetFileMapping(void);
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void SetRemappingSize(DWORD nSize); //设置重新映射尺寸，当分段映射时如果所读的位置到映射结尾不足指定长度时重新映射,缺省为1M
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void SetMappingSize(DWORD nSize); //设置一次映射的长度,缺省为512M
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protected:
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CFileMapping* m_pfMap;
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ULONGLONG m_ulFileLength;
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DWORD m_nRemappingSize;
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DWORD m_nMappingSize;
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};
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};
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inline CFileMapping* CFileSegyMapping::GetFileMapping(void)
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{
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return m_pfMap;
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}
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inline BOOL CFileSegyMapping::IsMappingOpen(void)
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{
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if(m_pfMap)
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if(m_pfMap->IsOpen()) return TRUE;
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return FALSE;
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}
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