Java client and a C++ server send and receive via TCP Socket

Question

I have a C++ server and two clients (ruby and java). Everything is running on a 64-bit linux-machine (java 1.7.0_17) The ruby client is fully working, but the java version m

Answer 1

while ((recv_count = recv(SocketFD, buffer, sizeof(buffer) - 1, 0)) > 0) {
      if (recv_count == -1) {

I don't know what your problem is but this code is certainly nonsense. It is impossible for the inner test ever to succeed.

Answer 2

PrintWriter buffer (when autoflush is true) is only flushed by calling println or printf. Calling print may not flush the buffer (Javadoc). Try calling println or use a OutputStreamWriter directly and flush(). Be aware of using the right charset (You can set it up in OutputStreamWriter constructor).

Answer 3

Close the stream respectively flush it in a way like this:

DataOutputStream dataOut = new DataOutputStream(socket.getOutputStream());
dataOut.writeUTF(s);
dataOut.flush();