howto create a thread to connect to tcp server and send binary data?

[Eng Hian]

Hi

 

I know this is a "Bug" mailing list. Forgive me but I am quite a newbie for C++ and commoncpp.

 

I want to write a program and can connect to a TCP server and then send and receive binary data (which may contain zeroes).

 

I found that are various classes like TCPSocket, TCPStream, tcpstream, ...

 

I also see that only TCP server example programs are available in the commoncpp.

 

If I use tcpstream to send binary with embedded '\0' I cannot use << operator.

 

Furthermore the data may not be terminated by endl. So to send I use:

 

class ThreadClient: public Thread
{
public:
 ThreadClient()
 {
  sleep(1000);
  start();
 }
 void run()
 {
  char inbuf[1024], outbuf[10];
  tcpstream tcp("127.0.0.1:3999");
  //CHUSocketPort tcp("127.0.0.1:3999");
  
  outbuf[0] = 'p';
  outbuf[1] = 'i';
  outbuf[2] = 'p';
  outbuf[3] = 'a';
  outbuf[4] = '\0';
  outbuf[5] = 'o';
  outbuf[6] = 'g';
  outbuf[7] = '\r';
  outbuf[8] = '\n';
  outbuf[9] = '\0';
  
  cout << "[Client]: Connected" << endl;
  //tcp << "pippo\r" << endl;
  //tcp << outbuf << endl;
  for (int i = 0; i < 8; i++) {
   cout << "[Client]: sent=" << outbuf[i] << endl;
   tcp.put(outbuf[i]);
  }
  tcp.sync();
  
  cout << "[Client]: Sent Message" << endl;
  tcp >> inbuf;
  cout << "[Reply]: " << inbuf << endl;
  tcp.close();
  cout << "[Client]: Disconnected" << endl;
 }
};

 

Questions:

(1) any other way to flush the send data without using sync()? Because I dont want to flush the input at the same time.

(2) the document says tcpstream is for non-threaded application. Can my code above be use then?

(3) If possible, can anyone provide me a sample source code that implements simple TCP client for send/receive binary data?

 

Thanks in advance.

/enghian