Is it possible to pass a Stream as ulong

Asked Sep 25 '17 at 07:27

Active Sep 25 '17 at 07:27

Viewed 127 times

I got an Interface method with an ulong out parameter.

int ReadStream(int channelID, out ulong handle, int timeout)

I'm wondering if it is possible to create a MemoryStream and pass a handle to this stream as out parameter.

like this, but I don't know if it is possible and if it is, how do I get a pointer to my stream and convert it to ulong? I tried this:

public override int ReadStream(int channelID, out ulong handle, int timeout)
{

  Stream localStream = new MemoryStream();

  GCHandle localHandle = GCHandle.Alloc(localStream, GCHandleType.Pinned);
  IntPtr pointer = localHandle.AddrOfPinnedObject();


  handle = pointer;
  return kSuccess;
}

asked Sep 25 '17 at 07:27

user3292642

1

Did you notice that kSuccess is never declared? – Marco Salerno Sep 25 '17 at 07:30
@MarcoSalerno kSuccess is a global constant, what does it matter? – user3292642 Sep 25 '17 at 07:31
Wouldn't the localStream be out of scope and collected anyway? – Mauro Sampietro Sep 25 '17 at 07:32
Why don't you just make the stream as a global variable to ensure that it won't be collected? – Marco Salerno Sep 25 '17 at 07:33
@sam I really don't know, thats why I'm asking is it even possible and if so, how is it done. – user3292642 Sep 25 '17 at 07:34
@Fildor its an interface method, I cannot change the signature. – user3292642 Sep 25 '17 at 07:35
@Fildor he might be implementing some interface – Mauro Sampietro Sep 25 '17 at 07:35
Ahh, sorry. Overread that part. – Fildor Sep 25 '17 at 07:36
Object contains non-primitive or non-blittable data. on the `GCHandle.Alloc(localStream, GCHandleType.Pinned);` [check also](https://stackoverflow.com/a/15549992/514449) – ASpirin Sep 25 '17 at 07:38
You could have a static dictionary in which the key is the ulong handle and the value the stream. This way we are sure your stream won't be collected. To get a pointer to the stream (to be used as key) look here: https://stackoverflow.com/a/37016762/711061 – Mauro Sampietro Sep 25 '17 at 07:42

Is it possible to pass a Stream as ulong

0 Answers0