c++多线程Ping代码

当然！以下是一个使用C++多线程编写的简单Ping代码示例：

#include <iostream>
#include <thread>
#include <chrono>
#include <atomic>

#ifdef _WIN32
#include <winsock2.h>
#include <ws2tcpip.h>
#pragma comment(lib, "ws2_32.lib")
#else
#include <unistd.h>
#include <sys/socket.h>
#include <arpa/inet.h>
#include <netinet/in.h>
#endif

std::atomic<bool> running(true);

void ping(const std::string& ip, int timeout) {
    while (running) {
        #ifdef _WIN32
        SOCKET sock = socket(AF_INET, SOCK_STREAM, 0);
        if (sock == INVALID_SOCKET) {
            std::cerr << "Failed to create socket" << std::endl;
            return;
        }

        sockaddr_in serverAddr{};
        serverAddr.sin_family = AF_INET;
        serverAddr.sin_port = htons(80);
        inet_pton(AF_INET, ip.c_str(), &(serverAddr.sin_addr));

        if (connect(sock, (struct sockaddr*)&serverAddr, sizeof(serverAddr)) != 0) {
            std::cout << ip << " is down" << std::endl;
        } else {
            std::cout << ip << " is up" << std::endl;
        }

        closesocket(sock);
        #else
        int sock = socket(AF_INET, SOCK_STREAM, 0);
        if (sock < 0) {
            std::cerr << "Failed to create socket" << std::endl;
            return;
        }

        sockaddr_in serverAddr{};
        serverAddr.sin_family = AF_INET;
        serverAddr.sin_port = htons(80);
        inet_pton(AF_INET, ip.c_str(), &(serverAddr.sin_addr));

        if (connect(sock, (struct sockaddr*)&serverAddr, sizeof(serverAddr)) != 0) {
            std::cout << ip << " is down" << std::endl;
        } else {
            std::cout << ip << " is up" << std::endl;
        }

        close(sock);
        #endif

        std::this_thread::sleep_for(std::chrono::milliseconds(timeout));
    }
}

int main() {
    std::string ip;
    int timeout;

    std::cout << "Enter IP address to ping: ";
    std::cin >> ip;

    std::cout << "Enter timeout (in milliseconds): ";
    std::cin >> timeout;

    std::thread pingThread(ping, ip, timeout);

    // Wait for user input to stop the ping thread
    std::cin.ignore();
    running = false;

    pingThread.join();

    return 0;
}

这段代码使用了sockets来实现Ping功能。它创建一个线程来定期尝试连接到指定的IP地址，并根据连接结果输出相应的信息。

请注意，此代码在Windows和Linux上都可以编译运行。在Windows上，它使用了Winsock库；在Linux上，它使用了socket库。因此，根据不同的操作系统，你可能需要进行一些调整和适配。

希望这个示例对你有所帮助！如果你有任何疑问，请随时提问。