private FileMappingWrapper(SafeFileMappingHandle handle)
{
Debug.Assert(handle != null);
Debug.Assert(!handle.IsInvalid, "handle is invalid");
FileMappingHandle = handle;
}
/// <summary>
///
/// </summary>
/// <param name="fileStream"></param>
/// <param name="mapName"></param>
/// <param name="capacity"></param>
/// <param name="access"></param>
/// <param name="memoryMappedFileSecurity"></param>
/// <param name="inheritability"></param>
/// <param name="leaveOpen"></param>
/// <returns></returns>
public static FileMappingWrapper CreateFromFile(
FileStream fileStream,
string mapName,
long capacity,
FileMappingAccess access,
FileMappingSecurity memoryMappedFileSecurity,
HandleInheritability inheritability,
bool leaveOpen
)
{
if (fileStream == null || fileStream.SafeFileHandle.IsInvalid ||
string.IsNullOrEmpty(mapName))
{
throw new ArgumentNullException("fileStream or mapname is null");
}
SafeFileMappingHandle handle = new SafeFileMappingHandle(Win32.CreateFileMapping(
fileStream.SafeFileHandle,
IntPtr.Zero,
Win32.PAGE_READWRITE,
0,
unchecked ((UInt32)capacity),
mapName
)
);
if (handle.IsInvalid)
{
throw new Exception("Could not create memory-mapped file.");
}
// throws
// ArgumentException
// ArgumentNullException
// ArgumentOutOfRangeException
// ObjectDisposedException
// UnauthorizedAccessException
// IOException
var wrapper = new FileMappingWrapper(handle);
wrapper.fileSize = fileStream.Length;
return(wrapper);
}
public static extern IntPtr MapViewOfFile(SafeFileMappingHandle hFileMappingObject,
UInt32 dwDesiredAccess,
UInt32 dwFileOffsetHigh, UInt32 dwFileOffsetLow,
IntPtr dwNumberOfBytesToMap);