public static void Connect(PipeHandle handle)
{
handle.State = InterProcessConnectionState.WaitingForClient;
bool connected = NamedPipeNative.ConnectNamedPipe(handle.Handle, null);
handle.State = InterProcessConnectionState.ConnectedToClient;
if (!connected && NamedPipeNative.GetLastError() != NamedPipeNative.ERROR_PIPE_CONNECTED)
{
handle.State = InterProcessConnectionState.Error;
}
}
public static PipeHandle ConnectToPipe(string pipeName, string serverName)
{
PipeHandle handle = new PipeHandle();
// Build the name of the pipe.
string name = @"\\" + serverName + @"\pipe\" + pipeName;
for (int i = 1; i <= ATTEMPTS; i++)
{
handle.State = InterProcessConnectionState.ConnectingToServer;
// Try to connect to the server
handle.Handle = NamedPipeNative.CreateFile(name, NamedPipeNative.GENERIC_READ | NamedPipeNative.GENERIC_WRITE, 0, null, NamedPipeNative.OPEN_EXISTING, 0, 0);
if (handle.Handle.ToInt32() != NamedPipeNative.INVALID_HANDLE_VALUE)
{
// The client managed to connect to the server pipe
handle.State = InterProcessConnectionState.ConnectedToServer;
// Set the read mode of the pipe channel
uint mode = NamedPipeNative.PIPE_READMODE_MESSAGE;
if (NamedPipeNative.SetNamedPipeHandleState(handle.Handle, ref mode, IntPtr.Zero, IntPtr.Zero))
{
break;
}
if (i >= ATTEMPTS)
{
handle.State = InterProcessConnectionState.Error;
return(null);
}
}
if (i >= ATTEMPTS)
{
if (NamedPipeNative.GetLastError() != NamedPipeNative.ERROR_PIPE_BUSY)
{
handle.State = InterProcessConnectionState.Error;
// After a certain number of unsuccessful attempt raise an exception
return(null);
}
else
{
handle.State = InterProcessConnectionState.Error;
return(null);
}
}
else
{
// The pipe is busy so lets wait for some time and try again
if (NamedPipeNative.GetLastError() == NamedPipeNative.ERROR_PIPE_BUSY)
{
NamedPipeNative.WaitNamedPipe(name, WAIT_TIME);
}
}
}
return(handle);
}
public static uint NumberPipeInstances(PipeHandle handle)
{
uint curInstances = 0;
if (NamedPipeNative.GetNamedPipeHandleState(handle.Handle, IntPtr.Zero, ref curInstances, IntPtr.Zero, IntPtr.Zero, IntPtr.Zero, IntPtr.Zero))
{
return(curInstances);
}
else
{
throw new Exception("Error getting the pipe state. Internal error: " + NamedPipeNative.GetLastError().ToString());
}
}