{

// 打开文件

_Assert(ptzFileName);

m_dwSize = 0;

m_pvFile = NULL;

m_hMapping = NULL;

m_hFile = _CreateFileForRead(ptzFileName);

if (m_hFile != INVALID_HANDLE_VALUE)

{

// 获取文件大小

m_dwSize = GetFileSize(m_hFile, NULL);

if ((m_dwSize != INVALID_FILE_SIZE) && m_dwSize)

{

// 创建文件映射

m_hMapping = CreateFileMapping(m_hFile, NULL, PAGE_READONLY, 0, 0, NULL);

if (m_hMapping)

{

// 映射文件

m_pvFile = MapViewOfFile(m_hMapping, FILE_MAP_READ, 0, 0, 0);

}

}

}

{

// 打开文件

_Assert(ptzFileName && dwSize);

m_dwSize = 0;

m_pvFile = NULL;

m_hMapping = NULL;

m_hFile = _CreateFileForAppend(ptzFileName);

if (m_hFile != INVALID_HANDLE_VALUE)

{

// 创建文件映射

m_dwSize = dwSize;

m_hMapping = CreateFileMapping(m_hFile, NULL, PAGE_READWRITE, 0, m_dwSize, NULL);

if (m_hMapping)

{

// 映射文件

m_pvFile = MapViewOfFile(m_hMapping, FILE_MAP_ALL_ACCESS, 0, 0, 0);

}

}