Question

The Java client can connect to the C++ server using TCP. The Java client is on Win7. The C++ server is on Linux.

The problem is I cannot send data successfully to the C++ server. The Java code is:

public static void main (String [] args ) throws IOException {
    Socket sock = new Socket("10.217.140.200",7000); 

    String id = "TEST";
    char encoding = 'a';

    ObjectOutputStream oos = new ObjectOutputStream(sock.getOutputStream());
    oos.flush();

    oos.writeObject(encoding);

---

After your kind helps, I now use outputstream and it works. Remember to delete the ObjectOutputStream oos = new ObjectOutputStream(sock.getOutputStream()); otherwise it will output 4 chars to c++ server.

Answer 1

You’re using an ObjectOutputStream, which does Java object serialisation. This is not (easily) portable across languages. Since you’re only sending a String, you don’t need to use an ObjectOutputStream – just use the OutputStream returned from the socket.