我无法将文本文件从客户端发送到服务器

Question

我现在用的是ubuntu 20.04。我在客户端文档中有文本文件。服务器可以监听端口，我可以发送文件，但是当我打开它时，没有文本。 客户端代码；

#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;
}

服务器代码；

#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;
}

我添加了 sys/socket.h 库，但第 65 行中的循环无法工作。我是这个主题的新手，所以我不知道该怎么做。我该如何处理？谢谢。