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c#windowswinapiinteropnamed-pipes
James
James

Reputation: 300

C# Interop GetNamedPipeClientProcessId ERROR_NOT_FOUND 1168 (0x490)

I cannot figure out why I am getting an ERROR_NOT_FOUND / 1168 (0x490) error code. If I replace GetNamedPipeClientProcessId with GetNamedPipeServerProcessId, I successfully get the server's process ID.

Code:

[DllImport("kernel32.dll", SetLastError = true)]
internal static extern bool GetNamedPipeClientProcessId(IntPtr Pipe, out int ClientProcessId);

int GetNamedPipeClientProcessId(NamedPipeServerStream pipeServer)
{
   var hPipe = pipeServer.SafePipeHandle.DangerousGetHandle();

    if (GetNamedPipeClientProcessId(hPipe, out var clientProcessId))
    {
        return clientProcessId;
    }
    else
    {
        var error = Marshal.GetLastWin32Error();
        return 0;
    }
}

Upvotes: 1

Views: 763

Answers (1)

Drake Wu
Drake Wu

Reputation: 7170

You need to call GetNamedPipeClientProcessId after the Client has called the CallNamedPipe or CreateFile to connect to the Name Pipe. If the client haven't connect to the Name Pipe, The GetNamedPipeClientProcessId will failed with ERROR_NOT_FOUND(0x490).

Upvotes: 3

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