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CentOS下C++网络编程如何实现

小樊
39
2025-03-17 15:59:27
栏目: 编程语言
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在CentOS系统下进行C++网络编程,通常会使用套接字(socket)API。以下是一个简单的TCP服务器和客户端的示例,展示了如何在CentOS上进行C++网络编程。

1. 安装必要的开发工具和库

首先,确保你已经安装了gcc编译器和相关的开发库。如果没有安装,可以使用以下命令进行安装:

sudo yum update
sudo yum groupinstall "Development Tools"
sudo yum install glibc-devel

2. 编写TCP服务器代码

创建一个名为tcp_server.cpp的文件,并添加以下代码:

#include <iostream>
#include <cstring>
#include <sys/socket.h>
#include <netinet/in.h>
#include <unistd.h>

#define PORT 8080

int main() {
    int server_fd, new_socket;
    struct sockaddr_in address;
    int opt = 1;
    int addrlen = sizeof(address);
    char buffer[1024] = {0};
    char *hello = "Hello from server";

    // Creating socket file descriptor
    if ((server_fd = socket(AF_INET, SOCK_STREAM, 0)) == 0) {
        perror("socket failed");
        exit(EXIT_FAILURE);
    }

    // Forcefully attaching socket to the port 8080
    if (setsockopt(server_fd, SOL_SOCKET, SO_REUSEADDR | SO_REUSEPORT, &opt, sizeof(opt))) {
        perror("setsockopt");
        exit(EXIT_FAILURE);
    }

    address.sin_family = AF_INET;
    address.sin_addr.s_addr = INADDR_ANY;
    address.sin_port = htons(PORT);

    // Forcefully attaching socket to the port 8080
    if (bind(server_fd, (struct sockaddr *)&address, sizeof(address)) < 0) {
        perror("bind failed");
        exit(EXIT_FAILURE);
    }

    if (listen(server_fd, 3) < 0) {
        perror("listen");
        exit(EXIT_FAILURE);
    }

    if ((new_socket = accept(server_fd, (struct sockaddr *)&address, (socklen_t*)&addrlen)) < 0) {
        perror("accept");
        exit(EXIT_FAILURE);
    }

    read(new_socket, buffer, 1024);
    std::cout << buffer << std::endl;
    send(new_socket, hello, strlen(hello), 0);
    std::cout << "Hello message sent\n";

    close(new_socket);
    close(server_fd);

    return 0;
}

3. 编写TCP客户端代码

创建一个名为tcp_client.cpp的文件,并添加以下代码:

#include <iostream>
#include <sys/socket.h>
#include <arpa/inet.h>
#include <unistd.h>
#include <string.h>

#define PORT 8080

int main() {
    struct sockaddr_in serv_addr;
    int sock = 0;
    char *hello = "Hello from client";
    char buffer[1024] = {0};

    if ((sock = socket(AF_INET, SOCK_STREAM, 0)) < 0) {
        std::cout << "\n Socket creation error \n";
        return -1;
    }

    serv_addr.sin_family = AF_INET;
    serv_addr.sin_port = htons(PORT);

    // Convert IPv4 and IPv6 addresses from text to binary form
    if(inet_pton(AF_INET, "127.0.0.1", &serv_addr.sin_addr) <= 0) {
        std::cout << "\nInvalid address/ Address not supported \n";
        return -1;
    }

    if (connect(sock, (struct sockaddr *)&serv_addr, sizeof(serv_addr)) < 0) {
        std::cout << "\nConnection Failed \n";
        return -1;
    }

    send(sock, hello, strlen(hello), 0);
    std::cout << "Hello message sent\n";
    read(sock, buffer, 1024);
    std::cout << "Server: " << buffer << std::endl;

    close(sock);

    return 0;
}

4. 编译代码

使用g++编译服务器和客户端代码:

g++ -o tcp_server tcp_server.cpp
g++ -o tcp_client tcp_client.cpp

5. 运行服务器和客户端

首先,在一个终端中运行服务器:

./tcp_server

然后,在另一个终端中运行客户端:

./tcp_client

你应该会看到服务器和客户端之间的通信输出。

总结

以上是一个简单的TCP服务器和客户端的示例,展示了如何在CentOS上进行C++网络编程。你可以根据需要扩展和修改这些代码,以实现更复杂的网络应用程序。

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