Connect to boost named pipe

Question

I have this code:

  boost::asio::io_service ios;
  std::vector<char> buf(20);
  bp::async_pipe ap(ios, "\\\\.\\pipe\\SamplePipe");
  boost::asio::async_read(ap, boost::asio::buffer(buf),
    [](const boost::system::error_code &ec, std::size_t size) {});
  ios.run();

Now, I execute echo 42 > \\.\pipe\SamplePipe in the cmd and expect an asynchronous read to the buffer to occur. But instead I get the following error: "All pipe instances are busy." Can somebody please explain to me why this is happening and how i can fix it?

this is sign that `ConnectNamedPipe` not called by your code. i dont know what is `bp::async_pipe` constructor doing but doubt that `ConnectNamedPipe` (or `NtFsControlFile` with `FSCTL_PIPE_LISTEN`) called inside constructor. — RbMm, Mar 19 '19 at 19:42

score 2 · Accepted Answer · answered May 27 '19 at 09:14

2

In the new version of the boost it's fixed. See this.

answered May 27 '19 at 09:14

parean

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It still doesn't work for unrelated processes. Named pipes are normally used for unrelated processes (you can use anonymous pipes for parent/child relationships). I had to resort to tcp sockets to get the functionality I enjoyed on Linux on the Windows OS using asio. – DAmann Aug 30 '21 at 12:38
Is your issue with unrelated processes related to windows 10 v1709 limitations listed here - https://learn.microsoft.com/en-us/windows/win32/api/winbase/nf-winbase-getnamedpipeclientsessionid#remarks – moi Sep 08 '21 at 17:23

Connect to boost named pipe

1 Answers1