I can't send text file from client to server - c++

Question

I'm using ubuntu 20.04 now. I have text file in client document. The server can listen the port and I can sen the file but when I open it, there is no text.
client code;
#include <iostream>
#include <string>
#include <cstring>
#include <fstream>
#include <sys/socket.h>
#include <arpa/inet.h>
#include <unistd.h>
const int BUFSIZE = 4096;
int main(int argc, char *argv[]) {
int client_socket;
struct sockaddr_in server_address;
char buffer[BUFSIZE];
// Create a socket
client_socket = socket(AF_INET, SOCK_STREAM, 0);
if (client_socket < 0) {
std::cerr << "Failed to create socket" << std::endl;
return 1;
}
// Set up the server address
memset(&server_address, 0, sizeof(server_address));
server_address.sin_family = AF_INET;
server_address.sin_port = htons(12345);
if (inet_aton("127.0.0.1", &server_address.sin_addr) == 0) {
std::cerr << "Invalid address" << std::endl;
return 1;
}
// Connect to the server
if (connect(client_socket, (struct sockaddr *) &server_address, sizeof(server_address)) < 0) {
std::cerr << "Failed to connect to server" << std::endl;
return 1;
}
std::cout << "Connected to server at " << inet_ntoa(server_address.sin_addr) << ":" << ntohs(server_address.sin_port) << std::endl;
// Send the file
std::ifstream input_file("file_to_send.txt", std::ios::binary); //
int bytes_sent;
while (input_file.read(buffer, BUFSIZE)) {
bytes_sent = send(client_socket, buffer, input_file.gcount(), 0);
if (bytes_sent < 0) {
std::cerr << "Failed to send data" << std::endl;
break;
}
}
input_file.close();
close(client_socket);
std::cout << "File 'file_to_send.txt' sent" << std::endl;
return 0;
}
server code;
#include <iostream>
#include <string>
#include <cstring>
#include <fstream>
#include <sys/socket.h>
#include <arpa/inet.h>
#include <unistd.h>
const int BUFSIZE = 4096;
int main(int argc, char *argv[]) {
int server_socket, client_socket;
struct sockaddr_in server_address, client_address;
socklen_t client_address_len;
char buffer[BUFSIZE];
// Create a socket
server_socket = socket(AF_INET, SOCK_STREAM, 0);
if (server_socket < 0) {
std::cerr << "Failed to create socket" << std::endl;
return 1;
}
// Set up the server address
memset(&server_address, 0, sizeof(server_address));
server_address.sin_family = AF_INET;
server_address.sin_addr.s_addr = htonl(INADDR_ANY);
server_address.sin_port = htons(12345);
// Bind the socket to the server address
if (bind(server_socket, (struct sockaddr *) &server_address, sizeof(server_address)) < 0) {
std::cerr << "Failed to bind socket" << std::endl;
return 1;
}
// Listen for incoming connections
if (listen(server_socket, 5) < 0) {
std::cerr << "Failed to listen on socket" << std::endl;
return 1;
}
std::cout << "Listening for incoming connections on port 12345.." << std::endl;
// Accept an incoming connection
client_address_len = sizeof(client_address);
client_socket = accept(server_socket, (struct sockaddr *) &client_address, &client_address_len);
if (client_socket < 0) {
std::cerr << "Failed to accept connection" << std::endl;
return 1;
}
std::cout << "Accepted connection from " << inet_ntoa(client_address.sin_addr) << std::endl;
// Receive the file
std::ofstream output_file("received_file.txt", std::ios::binary);
int bytes_received;
std::cout << "Bytes received: " << bytes_received << std::endl;
while( (bytes_received = recv(client_socket, buffer, BUFSIZE,0)))>0{
std::cout << "Bytses recieved are not null." << std::endl;
output_file.write(buffer , bytes_received); }
output_file.close();
close(client_socket);
close(server_socket);
std::cout << "File received and saved as 'received_file.txt'" << std::endl;
return 0;
}
I added sys/socket.h library but I think there is a problem in line 65. I ran the server and client. On terminaL, I see "Connected to server at" and "File 'file_to_send.txt' sent". And for server, I see "Listening for incoming connections on port","Accepted connection from ", "Bytes received: 0" and "File received and saved as 'received_file.txt'". "Hello world" is written in the text file I'm new to this topic so I don't know what to do properly. How can I handle this? Thank you.