private void openOrCreateMemoryAndWriteData <T>(T data)
{
mutex.WaitOne();
try
{
mapFile = MemoryMappedFile.Open(MapAccess.FileMapAllAccess, fileName);
}
catch
{
mapFile = MemoryMappedFile.Create(MapProtection.PageReadWrite, 8 * 1024, fileName);
}
Stream writer = mapFile.MapView(MapAccess.FileMapAllAccess, 0, 8 * 1024);
char[] charArrayOfObject = serializeToXml <T>(data).ToCharArray();
for (int i = 0; i < charArrayOfObject.Length; i++)
{
writer.WriteByte((byte)charArrayOfObject[i]);
}
writer.Flush();
writer.Close();
mutex.ReleaseMutex();
}
private void readDataFromMemory()
{
if (mapFile == null)
{
try
{
mapFile = MemoryMappedFile.Open(MapAccess.FileMapAllAccess, fileName);
}
catch
{
mapFile = null;
throw new Exception("File " + fileName + " is not opened yet.");
}
}
try
{
reader = mapFile.MapView(MapAccess.FileMapRead, 0, 8 * 1024);
}
catch (Exception)
{
Debug.WriteLine("Error in Reading");
}
getObjectFromMMF <TestData>();
}
/// <summary>
/// Create a named map object
/// </summary>
/// <param name="fileName">name of backing file, or null
/// for a pagefile-backed map</param>
/// <param name="protection">desired access to the mapping
/// object</param>
/// <param name="maxSize">maximum size of filemap object, or 0
/// for size of file</param>
/// <param name="name">name of file mapping object</param>
/// <returns>The memory mapped file instance</returns>
public static MemoryMappedFile Create( string fileName, MapProtection protection,
long maxSize, String name)
{
MemoryMappedFile map = new MemoryMappedFile();
// open file first
IntPtr hFile = INVALID_HANDLE_VALUE;
if ( fileName != null )
{
// determine file access needed
// we'll always need generic read access
int desiredAccess = GENERIC_READ;
if ( (protection == MapProtection.PageReadWrite) ||
(protection == MapProtection.PageWriteCopy) )
{
desiredAccess |= GENERIC_WRITE;
}
// open or create the file
// if it doesn't exist, it gets created
hFile = Win32MapApis.CreateFile (
fileName, desiredAccess, 0,
IntPtr.Zero, OPEN_ALWAYS, 0, IntPtr.Zero
);
if ( hFile == INVALID_HANDLE_VALUE )
throw new FileMapIOException ( Marshal.GetHRForLastWin32Error() );
// FIX: Is support neede for zero-length files!?!
}
map._hMap = Win32MapApis.CreateFileMapping (
hFile, IntPtr.Zero, (int)protection,
(int)((maxSize >> 32) & 0xFFFFFFFF),
(int)(maxSize & 0xFFFFFFFF), name
);
// close file handle, we don't need it
if ( hFile != INVALID_HANDLE_VALUE ) Win32MapApis.CloseHandle(hFile);
if ( map._hMap == NULL_HANDLE )
throw new FileMapIOException ( Marshal.GetHRForLastWin32Error() );
return map;
}
/// <summary>
/// Open an existing named File Mapping object
/// </summary>
/// <param name="access">desired access to the map</param>
/// <param name="name">name of object</param>
/// <returns>The memory mapped file instance</returns>
public static MemoryMappedFile Open( MapAccess access, String name )
{
MemoryMappedFile map = new MemoryMappedFile();
map._hMap = Win32MapApis.OpenFileMapping ( (int)access, false, name );
if ( map._hMap == NULL_HANDLE )
throw new FileMapIOException ( Marshal.GetHRForLastWin32Error() );
return map;
}
Create(string fileName, MapProtection protection,
long maxSize, String name)
{
MemoryMappedFile map = new MemoryMappedFile();
if (!map.Is64bit && maxSize > uint.MaxValue)
throw new ConstraintException("32bit systems support max size of 4gb.");
// open file first
IntPtr hFile = INVALID_HANDLE_VALUE;
if (!string.IsNullOrEmpty(fileName))
{
if (maxSize == 0)
{
if (!File.Exists(fileName))
{
throw new Exception(string.Format("Winterdom.IO.FileMap.MemoryMappedFile.Create - \"{0}\" does not exist ==> Unable to map entire file", fileName));
}
FileInfo backingFileInfo = new FileInfo(fileName);
maxSize = backingFileInfo.Length;
if (maxSize == 0)
{
throw new Exception(string.Format("Winterdom.IO.FileMap.MemoryMappedFile.Create - \"{0}\" is zero bytes ==> Unable to map entire file", fileName));
}
}
// determine file access needed
// we'll always need generic read access
int desiredAccess = GENERIC_READ;
if ((protection == MapProtection.PageReadWrite) ||
(protection == MapProtection.PageWriteCopy))
{
desiredAccess |= GENERIC_WRITE;
}
// open or create the file
// if it doesn't exist, it gets created
hFile = Win32MapApis.CreateFile(
fileName, desiredAccess, 0,
IntPtr.Zero, OPEN_ALWAYS, 0, IntPtr.Zero
);
if (hFile == INVALID_HANDLE_VALUE)
throw new FileMapIOException(Marshal.GetHRForLastWin32Error());
//SafeFileHandle handle = new SafeFileHandle(hFile,true);
//NTFS.Sparse.SparseFile.MarkSparse(handle);
map._fileName = fileName;
}
map._hMap = Win32MapApis.CreateFileMapping(
hFile, IntPtr.Zero, (int)protection,
(int)((maxSize >> 32) & 0xFFFFFFFF),
(int)(maxSize & 0xFFFFFFFF), name
);
// close file handle, we don't need it
if (hFile != INVALID_HANDLE_VALUE) Win32MapApis.CloseHandle(hFile);
if (map._hMap == NULL_HANDLE)
throw new FileMapIOException(Marshal.GetHRForLastWin32Error());
map._protection = protection;
map._maxSize = maxSize;
return map;
}
Create(string fileName, MapProtection protection,
long maxSize, String name)
{
MemoryMappedFile map = new MemoryMappedFile();
if (!map.Is64bit && maxSize > uint.MaxValue)
{
throw new ConstraintException("32bit systems support max size of 4gb.");
}
// open file first
IntPtr hFile = INVALID_HANDLE_VALUE;
if (!string.IsNullOrEmpty(fileName))
{
if (maxSize == 0)
{
if (!File.Exists(fileName))
{
throw new Exception(string.Format("Winterdom.IO.FileMap.MemoryMappedFile.Create - \"{0}\" does not exist ==> Unable to map entire file", fileName));
}
FileInfo backingFileInfo = new FileInfo(fileName);
maxSize = backingFileInfo.Length;
if (maxSize == 0)
{
throw new Exception(string.Format("Winterdom.IO.FileMap.MemoryMappedFile.Create - \"{0}\" is zero bytes ==> Unable to map entire file", fileName));
}
}
// determine file access needed
// we'll always need generic read access
int desiredAccess = GENERIC_READ;
if ((protection == MapProtection.PageReadWrite) ||
(protection == MapProtection.PageWriteCopy))
{
desiredAccess |= GENERIC_WRITE;
}
// open or create the file
// if it doesn't exist, it gets created
hFile = Win32MapApis.CreateFile(
fileName, desiredAccess, 0,
IntPtr.Zero, OPEN_ALWAYS, 0, IntPtr.Zero
);
if (hFile == INVALID_HANDLE_VALUE)
{
throw new FileMapIOException(Marshal.GetHRForLastWin32Error());
}
//SafeFileHandle handle = new SafeFileHandle(hFile,true);
//NTFS.Sparse.SparseFile.MarkSparse(handle);
map._fileName = fileName;
}
map._hMap = Win32MapApis.CreateFileMapping(
hFile, IntPtr.Zero, (int)protection,
(int)((maxSize >> 32) & 0xFFFFFFFF),
(int)(maxSize & 0xFFFFFFFF), name
);
// close file handle, we don't need it
if (hFile != INVALID_HANDLE_VALUE)
{
Win32MapApis.CloseHandle(hFile);
}
if (map._hMap == NULL_HANDLE)
{
throw new FileMapIOException(Marshal.GetHRForLastWin32Error());
}
map._protection = protection;
map._maxSize = maxSize;
return(map);
}
/// <summary>
/// Constructor used internally by MemoryMappedFile.
/// </summary>
/// <param name="backingFile">Preconstructed MemoryMappedFile</param>
/// <param name="mapSize">Size of the view, in bytes.</param>
/// <param name="isWriteable">True if Read/Write access is desired, False otherwise</param>
internal MapViewStream(MemoryMappedFile backingFile, long mapSize, bool isWriteable)
{
if (backingFile == null)
{
throw new Exception("MapViewStream.MapViewStream - backingFile is null");
}
if (!backingFile.IsOpen)
{
throw new Exception("MapViewStream.MapViewStream - backingFile is not open");
}
if ((mapSize < 1) || (mapSize > backingFile.MaxSize))
{
throw new Exception(string.Format("MapViewStream.MapViewStream - mapSize is invalid. mapSize == {0}, backingFile.MaxSize == {1}", mapSize, backingFile.MaxSize));
}
_backingFile = backingFile;
_isWriteable = isWriteable;
_access = isWriteable ? MapAccess.FileMapWrite : MapAccess.FileMapRead;
// Need a backingFile.SupportsAccess function that takes a MapAccess compares it against its stored MapProtection protection and returns bool
_mapSize = mapSize;
_isOpen = true;
// Map the first view
Seek(0, SeekOrigin.Begin);
}
/// ------------------------------------------------------------------------------------
/// <summary>
/// Initializes a new instance of the <see cref="T:PeFileProcessor"/> class.
/// </summary>
/// <param name="fileName">Name of the file.</param>
/// ------------------------------------------------------------------------------------
public PeFileProcessor(string fileName)
{
m_htDirectories = new Hashtable();
m_fileName = fileName;
m_mappedFile = MemoryMappedFile.Create(fileName, MapProtection.PageWriteCopy);
ProcessFile();
}
/// ------------------------------------------------------------------------------------
/// <summary>
/// Performs application-defined tasks associated with freeing, releasing, or
/// resetting unmanaged resources.
/// </summary>
/// <param name="fFromDispose">if set to <c>true</c> called from Dispose() - safe
/// to do stuff with managed objects; if <c>false</c> called from Finalizer - managed
/// objects might already be disposed.</param>
/// ------------------------------------------------------------------------------------
protected virtual void Dispose(bool fFromDispose)
{
if (fFromDispose)
{
if (m_reader != null)
m_reader.Close();
if (m_writer != null)
m_writer.Close();
if (m_stream != null)
m_stream.Dispose();
if (m_mappedFile != null)
m_mappedFile.Dispose();
}
m_reader = null;
m_writer = null;
m_stream = null;
m_mappedFile = null;
}
