Public Member Functions
	MEMORY_MAPPED_FILE (PSTR pszFileName)

	~MEMORY_MAPPED_FILE (void)

PVOID	GetBase (void)

DWORD	GetFileSize (void)

BOOL	IsValid (void)

errMMF	GetErrorType ()

Private Attributes
HANDLE	m_hFile

HANDLE	m_hFileMapping

PVOID	m_pMemoryMappedFileBase

DWORD	m_cbFile

errMMF	m_errCode

Detailed Description

Definition at line 79 of file genwindef.cc.

Constructor & Destructor Documentation

MEMORY_MAPPED_FILE::MEMORY_MAPPED_FILE ( PSTR pszFileName )

Definition at line 288 of file genwindef.cc.

References errMMF_FileMapping, errMMF_FileOpen, errMMF_MapView, and errMMF_NoError.

                                                          {
 
    //
    // Given a filename, the constructor opens a file handle, creates a file
    // mapping, and maps the entire file into memory.
    //
    m_hFile = INVALID_HANDLE_VALUE;
    m_hFileMapping = 0;
    m_pMemoryMappedFileBase = 0;
    m_cbFile = 0;
    m_errCode = errMMF_FileOpen;    // Initial error code: not found
     // First get a file handle      
    m_hFile = CreateFile(pszFileName, GENERIC_READ, FILE_SHARE_READ, NULL,
                        OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, (HANDLE)0);
                    
    if ( m_hFile == INVALID_HANDLE_VALUE )
    {
        m_errCode = errMMF_FileOpen;
        return;
    }
     m_cbFile = ::GetFileSize( m_hFile, 0 );
     // Now, create a file mapping   
    m_hFileMapping = CreateFileMapping(m_hFile,NULL, PAGE_READONLY, 0, 0,NULL);
    if ( m_hFileMapping == 0 )
    {
        // Oops.  Something went wrong.  Clean up.
        CloseHandle(m_hFile);
        m_hFile = INVALID_HANDLE_VALUE;
        m_errCode = errMMF_FileMapping;
        return;
    }
     m_pMemoryMappedFileBase = (PCHAR)MapViewOfFile( m_hFileMapping,
                                                    FILE_MAP_READ, 0, 0, 0);
     if ( m_pMemoryMappedFileBase == 0 )
    {
        // Oops.  Something went wrong.  Clean up.
        CloseHandle(m_hFileMapping);
        m_hFileMapping = 0;
        CloseHandle(m_hFile);
        m_hFile = INVALID_HANDLE_VALUE;
        m_errCode = errMMF_MapView;
        return;
    }
     m_errCode = errMMF_NoError;
 }

MEMORY_MAPPED_FILE::~MEMORY_MAPPED_FILE ( void )

Definition at line 334 of file genwindef.cc.

References errMMF_FileOpen.

 {
     // Clean up everything that was created by the constructor
     if ( m_pMemoryMappedFileBase )
         UnmapViewOfFile( m_pMemoryMappedFileBase );
 
     if ( m_hFileMapping )
         CloseHandle( m_hFileMapping );
 
     if ( m_hFile != INVALID_HANDLE_VALUE )
         CloseHandle( m_hFile ); 
 
     m_errCode = errMMF_FileOpen;
 }