Cannot receive more than one message when using c++ sockets - c++

Question

I have attached the code below, the title says it all. I am able to receive one message and then all other messages sent after the first don't get sent or arent read in.
Client, send_msg is called multiple times and cppClientSocket is the constructor that sets up the connection.
void cppClientSocket::send_msg(const char msg[], int size){
sendto(sockfd ,msg, size , 0, (struct sockaddr *)&serv, sizeof(serv));
}
cppClientSocket::cppClientSocket(int port){
sockfd = socket(AF_INET,SOCK_DGRAM,0);
serv.sin_family = AF_INET;
serv.sin_port = htons(port);
serv.sin_addr.s_addr = inet_addr("127.0.0.1");
};
Server, cppServerSocket is used to construct the other side of the UDP socket. Retrieve is called continuously from another class (within a while loop).
cppServerSocket::cppServerSocket(int port){
fd = socket(AF_INET, SOCK_DGRAM, 0);
if(fd<0){
std::cout << "AN error occured when creating the socket" << std::endl;
return;
}
addrlen = sizeof(remaddr); /* length of addresses */
/* bind the socket to any valid IP address and a specific port */
memset((char *)&myaddr, 0, sizeof(myaddr));
//set to udp
myaddr.sin_family = AF_INET;
//host to network - long : convert a number into a 32-bit network representation.
myaddr.sin_addr.s_addr = htonl(INADDR_ANY);
//host to network - short : convert a number into a 16-bit network representation.
myaddr.sin_port = htons(port);
if (bind(fd, (struct sockaddr *)&myaddr, sizeof(myaddr)) < 0) {
perror("bind failed");
return;
}
}
std::string cppServerSocket::retrieve(){
int count = recvfrom(fd, buf, BUFSIZE-1, 0, (struct sockaddr *)&remaddr, &addrlen);
if(!displayedError && count < 0){
std::cout << "An Error occured: " << strerror(errno) << std::endl;
displayedError = true;
return "";
}
if (count >= 0){
printf("received message: \"%s\"\n", buf);
std::string rcv(buf,count);
return rcv;
}
}
Appreciate the help!
UPDATE
If I modify the retrieve so that it acts like a server that will simply print every message it recieves, it works fine without error...
std::string cppServerSocket::retrieve(){
for(;;){
int count = recvfrom(fd, buf, BUFSIZE-1, 0, (struct sockaddr *)&remaddr, &addrlen);
if(!displayedError && count < 0){
std::cout << "An Error occured: " << strerror(errno) << std::endl;
displayedError = true;
//return "";
}else if (count >= 0){
printf("received message: \"%s\"\n", buf);
std::string rcv(buf,count);
//return rcv;
}
}
return "";
}
Below added the code that was used to call the original retrieve() method.
void check_socket(cppServerSocket css){
string temp;
temp.append(css.retrieve());
if(temp.size()>0){
std::cout << temp << std::endl; //for debugging
debug.push_back(temp);
debug.pop_front();
}
}
Below is the code inside of main that calls the check_socket() method
//code inside of main
cppServerSocket css(3000);
for(int i=0; i< test_time; i++){
printScreen(test_devices, test_dev_status, false);
t = clock();
while(clock() - t < CLOCKS_PER_SEC){
check_socket(css);
}
}

Answer 1

GOT IT!!!
The problem was in check_socket(cppServerSocket css), because I was not passing by reference the descructor of my cppServerSocket was getting called, and in that destructor I had specified that the socket should close. So after the first message was recieved the socked would be closed. To fix this i passed cppServerSocket by reference
void check_socket(cppServerSocket &css){
string temp;
temp.append(css.retrieve());
if(temp.size()>0){
std::cout << temp << std::endl; //for debugging
debug.push_back(temp);
debug.pop_front();
}
}
Thanks to all for the help!