Segfault on `SteamNetworkingMessage_t.Release()`

Hi there,

I’m running the latest (giturl) install of Steamworks.NET and am sending and receiving messages just fine it seems.

However when I call the recommended Release method on a SteamNetworkingMessage_t, I get a segfault.

My code is here:

        try
        {
          SteamNetworkingMessage_t netMessage = Marshal.PtrToStructure<SteamNetworkingMessage_t>(receiveBuffers[0]);
          byte[] message = new byte[netMessage.m_cbSize];
          Marshal.Copy(netMessage.m_pData, message, 0, message.Length);


          payload = new ArraySegment<byte>(message);
          clientId = netMessage.m_identityPeer.GetSteamID64();

          Debug.Log($"PollEvent(); // message received at {receiveTime} from {clientId}");

          netMessage.Release(); // <----- Commenting this line prevents segfault
        }
        finally
        {
          Marshal.DestroyStructure<SteamNetworkingMessage_t>(receiveBuffers[0]);
        }

Any ideas? Happy to share more code if needed.

[AG4W]

Hi there,

I’m running the latest (giturl) install of Steamworks.NET and am sending and receiving messages just fine it seems.

However when I call the recommended Release method on a SteamNetworkingMessage_t, I get a segfault.

My code is here:

        try
        {
          SteamNetworkingMessage_t netMessage = Marshal.PtrToStructure<SteamNetworkingMessage_t>(receiveBuffers[0]);
          byte[] message = new byte[netMessage.m_cbSize];
          Marshal.Copy(netMessage.m_pData, message, 0, message.Length);


          payload = new ArraySegment<byte>(message);
          clientId = netMessage.m_identityPeer.GetSteamID64();

          Debug.Log($"PollEvent(); // message received at {receiveTime} from {clientId}");

          netMessage.Release(); // <----- Commenting this line prevents segfault
        }
        finally
        {
          Marshal.DestroyStructure<SteamNetworkingMessage_t>(receiveBuffers[0]);
        }

Any ideas? Happy to share more code if needed.

You can wrangle NativeMethods in this way to expose the underlying method (internal to public) and call it through the API.

[DllImport(NativeLibraryName, EntryPoint = "SteamAPI_SteamNetworkingMessage_t_Release", CallingConvention = CallingConvention.Cdecl)]
public static extern void SteamAPI_SteamNetworkingMessage_t_Release(IntPtr self);

I use some extension methods to do it.

public static class MessageExtensions
{
    public static T To<T>(this IntPtr pointer) => Marshal.PtrToStructure<T>(pointer);
    public static void Read(this IntPtr pointer, NetworkBuffer buffer) => Marshal.Copy(Marshal.PtrToStructure<SteamNetworkingMessage_t>(pointer).m_pData, buffer.Payload, 0, buffer.Payload.Length);
    public static void Release(this IntPtr pointer) => NativeMethods.SteamAPI_SteamNetworkingMessage_t_Release(pointer);
}

[fghl]

@AG4W This worked as advertised, thanks for the help!