ZeroMQ C # client does not receive messages from C ++ server

Question

I tried to program sending messages from one server to several clients. I have to use C # on the client side, C ++ on the server side. I took an example http://zguide.zeromq.org/page:all#toc8 for the server:

#define within(num) (int) ((float) num * rand () / (RAND_MAX + 1.0)) int main () { // Prepare our context and publisher zmq::context_t context (1); zmq::socket_t publisher (context, ZMQ_PUB); publisher.bind("tcp://*:5556"); //publisher.bind("ipc://weather.ipc"); // Initialize random number generator srand ((unsigned) time (NULL)); while (1) { int zipcode, temperature, relhumidity; // Get values that will fool the boss zipcode = within (100000); temperature = within (215) - 80; relhumidity = within (50) + 10; // Send message to all subscribers zmq::message_t message(20); _snprintf ((char *) message.data(), 20 , "%05d %d %d", zipcode, temperature, relhumidity); publisher.send(message); } return 0; } 

And for the client:

 namespace ZMQGuide { internal class Program { public static void Main(string[] args) { Console.WriteLine("Collecting updates from weather server…"); // default zipcode is 10001 string zipcode = "10001 "; // the reason for having a space after 10001 is in case of the message would start with 100012 which we are not interested in if (args.Length > 0) zipcode = args[1] + " "; using (var context = new Context(1)) { using (Socket subscriber = context.Socket(SocketType.SUB)) { subscriber.Subscribe(zipcode, Encoding.Unicode); subscriber.Connect("tcp://localhost:5556"); const int updatesToCollect = 100; int totalTemperature = 0; for (int updateNumber = 0; updateNumber < updatesToCollect; updateNumber++) { string update = subscriber.Recv(Encoding.Unicode); totalTemperature += Convert.ToInt32(update.Split()[1]); } Console.WriteLine("Average temperature for zipcode {0} was {1}F", zipcode, totalTemperature / updatesToCollect); } } } } } 

They do not communicate with each other. On the client side (C ++), I commented on the line with ipc interaction, because on the Windows client, ipc failed. C # - C #, C ++ - C ++ interaction works correctly in this case. I am using clrzmq 2.2.5.

I would appreciate any help.

Answer 1

The C # client uses Encoding.Unicode, which is a two-byte Unicode representation (UTF-16). C ++ server uses ASCII.

ZMQ subscription selection works at the byte level and does not convert between character encodings, so this is my problem. Switching to Encoding.ASCII or Encoding.UTF8 on a C # server solves this problem.