How does the disconnectnamedpipe function work in Win32?

If the client end of the specified name pipe is open, the DisconnectNamedPipe function is used to close that end of the named pipe. The client then receives an error message while trying to access the channel. A client preempted by DisconnectNamedPipe from the right pipe should always use the specific CloseHandle function to close its end connected to the pipe.

When does connectnamedpipe return in nonblocking mode?

If all specified pipe handles have non-blocking functionality, ConnectNamedPipe always returns immediately. In non-blocking form, ConnectNamedPipe returns nonzero when calling a disconnected string instance from another client.

Steps to resolve Connect namedpipe error 535

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If you are facing Connect namedpipe error 535 on your system, this blog post may help you.

  // Connection to client channel failedif ((Success! = 1) && (Marshal.GetLastWin32Error ()! = 535))    Pause;

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I am trying to implement communication between two processes pointing to named pipes. To be more specific (don’t think it influences the question) I want duplicate Matlab instances to communicate with each other.

So far, everything works fine, but when it comes to 10% of all cases, it means there is another at the endth process connected to the line …

  pipe = CreateNamedPipe (uniquePipeName, // name with pipe    TUBE_ACCESS_DUPLEX, //    PIPE_TYPE_MESSAGE, // provide data as a byte stream    1, // only allow one occurrence of this pipe    1, // no output buffer    0, // no input buffer    0, // use standard fetch time    NULL // Use go delinquent security attributes    );... most of the error handling ...result = ConnectNamedPipe (pipe, NULL);if (! result)    Print error ()    CloseHandle (pipe);    Get well;NumberBytesWritten = 0;printf ("send% lg  n", * uPtrs [0]);The result is WriteFile (pipe, // handle to our trusted pipe    uPtrs [0], // knowledge to send    Size (double),    & numBytesWritten, // stores the actual amount of data sent    NULL // Do Not Use Overlapping I / O    );if (! result)    Print error ()CloseHandle (pipe);

  while (true)    if (! WaitNamedPipe (uniquePipeName, NMPWAIT_USE_DEFAULT_WAIT))        Continue; // timeout, try again    Pipe = CreateFile (        unique pipe name,        GENERIC_READ, // only need read access        0, // FILE_SHARE_READ,        ZERO,        OPEN_EXISTING,        FILE_ATTRIBUTE_NORMAL,ZERO        );    supplied (pipe! = INVALID_HANDLE_VALUE)        Pause;    another                printf ("Connected!  n");Result = GetFile (    A tube,    & buffer_in, // your channel data is stored here    Size (double),    // 127 * sizeof (wchar_t), // assigned group of bytes    & numBytesRead, // this stores a number created from the bytes actually read    NULL // Do Not Use Overlapping I / O    );printf ("Received:% lg  n", buffer_in);printf ("Received:% lg  n", buffer_out);y [0] is equal to buffer_in;CloseHandle (pipe);