c++ - 使用 boost 检查端口可用性

Question

我正在尝试检查我电脑上的端口是否可用。但是这段代码在 acceptor.listen(); 之后崩溃了。崩溃堆栈跟踪停止于:

 detail/impl/win_iocp_socket_service_base.ipp

我的代码是:

    try {
        boost::asio::io_service io_service;
        boost::asio::ip::tcp::acceptor acceptor(io_service);
        boost::asio::ip::tcp::endpoint endpoint(boost::asio::ip::address::from_string("127.0.0.1"), port);
        acceptor.open(endpoint.protocol());
        acceptor.set_option(boost::asio::ip::tcp::acceptor::reuse_address(false));
        acceptor.bind(endpoint);
        acceptor.listen();
    }
    catch (...) {
        // port busy
    }

我如何用 boost 检查这个或者我的代码哪里有问题？

UPD1:我尝试使用来自 here 的代码:

bool port_in_use(unsigned short port) {
using namespace boost::asio;
using ip::tcp;

    io_service svc;
    tcp::acceptor a(svc);

    boost::system::error_code ec;
    a.open(tcp::v4(), ec) || a.bind({ tcp::v4(), port }, ec);

    return ec == error::address_in_use;
}

但是在函数执行后，我的程序仍然在同一个地方崩溃。

Answer 1

好吧，我找到了如何在 Windows 中执行此操作(来自 link ):

#ifndef UNICODE
#define UNICODE
#endif

#define WIN32_LEAN_AND_MEAN

#include <winsock2.h>
#include <ws2tcpip.h>
#include <stdio.h>

// Need to link with Ws2_32.lib
#pragma comment(lib, "ws2_32.lib")

int wmain()
{
    //----------------------
    // Initialize Winsock
    WSADATA wsaData;
    int iResult = WSAStartup(MAKEWORD(2, 2), &wsaData);
    if (iResult != NO_ERROR) {
        wprintf(L"WSAStartup function failed with error: %d\n", iResult);
        return 1;
    }
    //----------------------
    // Create a SOCKET for connecting to server
    SOCKET ConnectSocket;
    ConnectSocket = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
    if (ConnectSocket == INVALID_SOCKET) {
        wprintf(L"socket function failed with error: %ld\n", WSAGetLastError());
        WSACleanup();
        return 1;
    }
    //----------------------
    // The sockaddr_in structure specifies the address family,
    // IP address, and port of the server to be connected to.
    sockaddr_in clientService;
    clientService.sin_family = AF_INET;
    clientService.sin_addr.s_addr = inet_addr("127.0.0.1");
    clientService.sin_port = htons(27015);

    //----------------------
    // Connect to server.
    iResult = connect(ConnectSocket, (SOCKADDR *) & clientService, sizeof (clientService));
    if (iResult == SOCKET_ERROR) {
        wprintf(L"connect function failed with error: %ld\n", WSAGetLastError());
        iResult = closesocket(ConnectSocket);
        if (iResult == SOCKET_ERROR)
            wprintf(L"closesocket function failed with error: %ld\n", WSAGetLastError());
        WSACleanup();
        return 1;
    }

    wprintf(L"Connected to server.\n");

    iResult = closesocket(ConnectSocket);
    if (iResult == SOCKET_ERROR) {
        wprintf(L"closesocket function failed with error: %ld\n", WSAGetLastError());
        WSACleanup();
        return 1;
    }

    WSACleanup();
    return 0;
}