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client.cpp
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client.cpp
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#include <iostream> // For standard input/output operations
#include <string> // For string manipulation
#include <sys/socket.h> // For socket creation and manipulation functions
#include <arpa/inet.h> // For internet protocol address conversion functions
#include <unistd.h> // For close, read, write, etc. system calls
#include <thread> // For creating and managing threads
class ChatClient {
private:
int clientSocket; // File descriptor for the client socket
std::string serverIP; // IP address of the chat server
int serverPort; // Port number used by the chat server
public:
ChatClient(const std::string& ip, int port); // Constructor to initialize client
void start(); // Starts the chat client loop
void sendMessage(const std::string& message); // Sends a message to the server
void receiveMessages(); // Receives messages from the server in a separate thread
};
// Constructor: Initializes the client socket and connection details
ChatClient::ChatClient(const std::string& ip, int port) : serverIP(ip), serverPort(port) {
// Create a socket
clientSocket = socket(AF_INET, SOCK_STREAM, 0);
if (clientSocket == -1) {
std::cerr << "Could not create socket" << std::endl;
exit(1);
}
// Structure to hold server address information
sockaddr_in serverAddr;
serverAddr.sin_family = AF_INET; // Address family: Internet Protocol (IPv4)
serverAddr.sin_port = htons(serverPort); // Convert port number to network byte order
serverAddr.sin_addr.s_addr = inet_addr(serverIP.c_str()); // Convert IP address string to network byte order
// Connect to the server
if (connect(clientSocket, (struct sockaddr*)&serverAddr, sizeof(serverAddr)) < 0) {
std::cerr << "Connection failed" << std::endl;
exit(1);
}
}
// Starts the chat client by creating a thread for receiving messages and entering a loop for sending messages
void ChatClient::start() {
// Create a thread to handle receiving messages from the server
std::thread receiveThread(&ChatClient::receiveMessages, this);
// Detach the thread so it runs independently from the main thread
receiveThread.detach();
// Main loop for sending messages to the server
while (true) {
std::string message;
std::getline(std::cin, message);
sendMessage(message);
}
}
// Sends a message to the server
void ChatClient::sendMessage(const std::string& message) {
// Send the message string to the server socket
send(clientSocket, message.c_str(), message.size(), 0);
}
// Continuously receives messages from the server in a separate thread
void ChatClient::receiveMessages() {
char buffer[1024] = {0}; // Buffer to store received messages
while (true) {
// Read data from the server socket
int valRead = read(clientSocket, buffer, 1024);
// Check for errors or connection termination
if (valRead <= 0) {
std::cerr << "Server disconnected" << std::endl;
break;
}
// Create a string object from the received data
std::string message(buffer, valRead);
// Print the received message to the console
std::cout << "Received message: " << message << std::endl;
}
}
int main() {
// Create a ChatClient object with server IP and port
ChatClient client("127.0.0.1", 8081);
// Start the chat client
client.start();
return 0;
}