private SharedMemoryMapView(SharedMemorySafeHandle sharedMemoryHandle, ulong sharedMemorySize)
{
this.sharedMemoryHandle = sharedMemoryHandle;
memoryMappingHandle = Native.MapViewOfFile(
sharedMemoryHandle,
Native.MemoryMappedFileAccess.FileMapAllAccess,
fileOffsetHigh: 0,
fileOffsetLow: 0,
numberOfBytesToMap: (int)sharedMemorySize);
Buffer = memoryMappingHandle.DangerousGetHandle();
MemSize = sharedMemorySize;
}
/// <summary>
/// Opens an existing shared memory view.
/// </summary>
/// <param name="sharedMemoryMapName"></param>
/// <param name="sharedMemorySize"></param>
/// <returns></returns>
public static new SharedMemoryMapView OpenExisting(string sharedMemoryMapName, ulong sharedMemorySize)
{
SharedMemorySafeHandle sharedMemoryHandle = Native.OpenFileMapping(
Native.MemoryMappedFileAccess.FileMapRead | Native.MemoryMappedFileAccess.FileMapWrite,
false,
sharedMemoryMapName);
if (sharedMemoryHandle.IsInvalid)
{
throw new FileNotFoundException(
$"Failed to OpenFileMapping {sharedMemoryMapName}",
innerException: new Win32Exception(Marshal.GetLastWin32Error()));
}
Security.VerifyHandleOwner(sharedMemoryHandle);
return(new SharedMemoryMapView(sharedMemoryHandle, sharedMemorySize));
}
internal static extern MemoryMappingSafeHandle MapViewOfFile(
SharedMemorySafeHandle fileMapping,
MemoryMappedFileAccess desiredAccess,
int fileOffsetHigh,
int fileOffsetLow,
int numberOfBytesToMap);
