NamedPipeClientStream not implemented in Unity 2019.4.22f1 (LTS) IL2CPP

Unity Engine
1

Hi. I’m getting the following error when trying to instantiate a NamedPipeClientStream on Unity 2019.4.22f1 on an Android device using IL2CPP. This error does not occur when using the Mono backend.

03-20 16:03:36.924  5207  5279 E Unity   : NotImplementedException: The method or operation is not implemented.
03-20 16:03:36.924  5207  5279 E Unity   :   at System.IO.Pipes.NamedPipeClientStream..ctor (System.String serverName, System.String pipeName, System.IO.Pipes.PipeAccessRights desiredAccessRights, System.IO.Pipes.PipeOptions options, System.Security.Principal.TokenImpersonationLevel impersonationLevel, System.IO.HandleInheritability inheritability) [0x00000] in <00000000000000000000000000000000>:0
03-20 16:03:36.924  5207  5279 E Unity   :   at System.IO.Pipes.NamedPipeClientStream..ctor (System.String serverName, System.String pipeName, System.IO.Pipes.PipeDirection direction, System.IO.Pipes.PipeOptions options) [0x00000] in <00000000000000000000000000000000>:0

I found a (fixed) bug report for this here (Unity Issue Tracker - [IL2CPP] NotImplementedException is thrown when use System.IO.Pipes), so, this feels like a regression?

Thanks.

2

Thanks for reporting this issue. The bug fix you mentioned occurred only on Windows platforms. At the moment, named pipes are not supported for IL2CPP on non-Windows platforms (which includes Android of course).

I’m curious, what is the use case you have for named pipes on Android?

3

We use FFMPEG for audio conversion and read the result from a named pipe to avoid having to go through an actual file.

As a workaround for the class not being available, I’m now simply using Java to read from the pipe and pass the (buffered) results a megabyte at a time to C#, which works and is as performant as the NamedPipeClientStream on Mono.

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4

Hi. Is there any update regarding the support of IL2CPP?
Im trying to use a NamedPipeClientStream with WebGL and only found this fixed issue (Unity Issue Tracker - [IL2CPP] PlatformNotSupportedException when instantiating a System.IO.Pipes.NamedPipeClientStream). I’m currently using version 2021.3.27f1 (LTS).

The development console throws:

PlatformNotSupportedException: Operation is not supported on this platform.
at System.IO.Pipes.PipeStream.GetPipePath (System.String serverName, System.String pipeName)

Thank you in advance.

Edit:
As far as I see there is no problem with IL2CPP (building a native Windows application based on IL2CPP works) but with WebGL as it seems to not support working with named pipes.
Nonetheless I would be happy to get approval on my theorie or deviating information.
Thanks.

5

We don’t expect to support named pipe on WebGL at any point in the future. The underlying platform does not have the support we need for them, as far as I know.

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