tcpip端口被占用 c++

当TCP/IP端口被占用时，可以使用C++编写的程序来查找和释放该端口。以下是一个简单的C++程序，可以用来查找和释放指定端口：

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

#pragma comment(lib, "Ws2_32.lib")

int main()
{
    // 初始化Winsock
    WSADATA wsaData;
    int iResult = WSAStartup(MAKEWORD(2, 2), &wsaData);
    if (iResult != 0) {
        std::cout << "WSAStartup failed: " << iResult << std::endl;
        return 1;
    }

    // 创建一个socket
    SOCKET sock = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
    if (sock == INVALID_SOCKET) {
        std::cout << "socket failed: " << WSAGetLastError() << std::endl;
        WSACleanup();
        return 1;
    }

    // 设置要查找的端口号
    int port = 8080;

    // 绑定socket到指定端口
    sockaddr_in addr;
    addr.sin_family = AF_INET;
    addr.sin_port = htons(port);
    addr.sin_addr.s_addr = htonl(INADDR_ANY);
    iResult = bind(sock, (SOCKADDR*)&addr, sizeof(addr));
    if (iResult == SOCKET_ERROR) {
        std::cout << "bind failed: " << WSAGetLastError() << std::endl;
        closesocket(sock);
        WSACleanup();
        return 1;
    }

    // 释放socket
    closesocket(sock);
    WSACleanup();

    std::cout << "Port " << port << " is available." << std::endl;

    return 0;
}

该程序首先初始化Winsock，然后创建一个socket并绑定到指定端口。如果绑定失败，则说明该端口已被占用。程序最后释放socket并清理Winsock。