public Stream MapView(MapAccess access, long offset, IntPtr size)
{
if (!IsOpen)
{
throw new ObjectDisposedException("MMF already closed");
}
IntPtr baseAddress = IntPtr.Zero;
baseAddress = Win32MapApis.MapViewOfFile(
_hMap, (int)access,
(int)((offset >> 32) & 0xFFFFFFFF),
(int)(offset & 0xFFFFFFFF), size
);
if (baseAddress == IntPtr.Zero)
{
throw new FileMapIOException(Marshal.GetHRForLastWin32Error());
}
// Find out what MapProtection to use
// based on the MapAccess flags...
MapProtection protection;
if (access == MapAccess.FileMapRead)
{
protection = MapProtection.PageReadOnly;
}
else
{
protection = MapProtection.PageReadWrite;
}
return(new MapViewStream(baseAddress, size.ToInt64(), protection));
}
public IntPtr MapView(MapAccess access, long offset, long size)
{
if (!IsOpen)
{
throw new ObjectDisposedException("Winterdom.IO.FileMap.MemoryMappedFile.MapView - MMF already closed");
}
// Throws OverflowException if (a) this is a 32-bit platform AND (b) size is out of bounds (ie. int bounds) with respect to this platform
IntPtr mapSize = new IntPtr(size);
IntPtr baseAddress = Win32MapApis.MapViewOfFile(
_hMap, (int)access,
(int)((offset >> 32) & 0xFFFFFFFF),
(int)(offset & 0xFFFFFFFF), mapSize
);
if (baseAddress == IntPtr.Zero)
{
throw new FileMapIOException(Marshal.GetHRForLastWin32Error());
}
return(baseAddress);
}
