int client_main(int argc, char *argv[])
{
if ((argc < 3) || (argc > 4))
{ // Test for correct number of arguments
std::cerr << "Usage: " << argv[0]
<< " <Server> <Echo String> [<Server Port>]\n";
exit(1);
}
std::string servAddress = argv[1]; // First arg: server address
char* echoString = argv[2]; // Second arg: string to echo
int echoStringLen = strlen(echoString); // Length of string to echo
if (echoStringLen > ECHOMAX)
{ // Check input length
std::cerr << "Echo string too long" << std::endl;
exit(1);
}
unsigned short echoServPort = Socket::ResolveService(
(argc == 4) ? argv[3] : "echo", "udp");
try
{
UDPSocket sock;
// Send the string to the server
sock.SendTo(echoString, echoStringLen, servAddress, echoServPort);
// Receive a response
char echoBuffer[ECHOMAX + 1]; // Buffer for echoed string + \0
int respStringLen; // Length of received response
if ((respStringLen = sock.Receive(echoBuffer, ECHOMAX)) != echoStringLen)
{
std::cerr << "Unable to receive" << std::endl;
exit(1);
}
echoBuffer[respStringLen] = '\0'; // Terminate the string!
std::cout << "Received: " << echoBuffer << std::endl; // Print the echoed arg
// Destructor closes the socket
}
catch (SocketException &e)
{
std::cerr << e.what() << std::endl;
exit(1);
}
return 0;
}
void Run()
{
const int port = 30003;
UDPSocket socket;
socket.Bind(port);
const char sendbuffer[] = "hello world!";
socket.Send(Address(127,0,0,1,port), sendbuffer, sizeof(sendbuffer));
sleep_ms(50);
char rcvbuffer[256];
memset(rcvbuffer, 0, sizeof(rcvbuffer));
Address sender;
for(;;)
{
int bytes_read = socket.Receive(sender, rcvbuffer, sizeof(rcvbuffer));
if(bytes_read < 0)
break;
}
//FIXME: This fails on some systems
assert(strncmp(sendbuffer, rcvbuffer, sizeof(sendbuffer))==0);
assert(sender.getAddress() == Address(127,0,0,1, 0).getAddress());
}