Class CUT_MapFileDataSource

UTCP/include/UTDataSource.h:179–225

================================================================= CUT_MapFileDataSource Data source class for CUT_Msg class based on the mapped file =================================================================

//  Data source class for CUT_Msg class based on the mapped file
// =================================================================
class CUT_MapFileDataSource : public CUT_DataSource {
protected:
    _TCHAR          m_szFileName[MAX_PATH + 1]; // File name
    std::string     m_szName;                   // Datasource name

    HANDLE          m_hFile;                        // File handle
    HANDLE          m_hMapFile;                     // File map handle
    LPSTR           m_lpMapAddress;                 // Pointer to the data

    LARGE_INTEGER   m_lnSize;                       // Allocated data size
    LARGE_INTEGER   m_lnPosition;                   // Current position
    LARGE_INTEGER   m_lnActualSize;                 // Actual size of data
    LARGE_INTEGER   m_lnIncrement;                  // Increment size

    OpenMsgType     m_OpenType;                     // Last open type

    BOOL            m_bTempFileName;                // If TRUE delete file while closing

public:
    CUT_MapFileDataSource(DWORD SizeHigh, DWORD SizeLow, LPCSTR name = NULL, LPCTSTR filename = NULL);
    virtual ~CUT_MapFileDataSource();

    // Virtual clone constructor
    virtual CUT_DataSource * clone();

    // Opens data file type == UTM_OM_READING, UTM_OM_WRITING, UTM_OM_APPEND
    virtual int     Open(OpenMsgType type);

    // Close data file
    virtual int     Close();

    // Read one line from the data file
    virtual int     ReadLine(LPSTR buffer, size_t maxsize);

    // Write one line to the data file
    virtual int     WriteLine(LPCSTR buffer);

    // Read data
    virtual int     Read(LPSTR buffer, size_t count);

    // Write data
    virtual int     Write(LPCSTR buffer, size_t count);

    // Move a current pointer to the specified location.
    virtual long    Seek(long offset, int origin);

};

#endif