为什么我的套接字的开放端口没有被 netstat 列出? [英] Why is my socket's open port not listed by netstat?

问题描述

如果您运行此示例，您将看到 netstat 永远不会列出该端口.为什么?我该怎么做?

If you run this example, you'll see the port is never listed by netstat. Why? And how do I make it so?

#include <WinSock.h>
#include <io.h>
#include <stdio.h>

#pragma comment(lib, "WS2_32")

int main() {
    WORD wVers = MAKEWORD(2, 2);
    WSADATA wsa;
    WSAStartup(wVers, &wsa);
    SOCKET sock = socket(AF_INET, SOCK_STREAM, 6);
    if (sock != INVALID_SOCKET) {
        struct sockaddr_in addr = { 0 };
        addr.sin_family = AF_INET;
        addr.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
        int addrlen = sizeof(addr);
        bind(sock, (struct sockaddr *)&addr, addrlen);
        if (getsockname(sock, (struct sockaddr *)&addr, &addrlen) == 0) {
            fprintf(stdout, "HANDLE = %d, port = %d\n", sock, addr.sin_port);
            fflush(stdout);
            system("netstat -a -n");
        }
        closesocket(sock);
    }
    WSACleanup();
}

推荐答案

netstat -a 只列出连接的套接字和监听的套接字.

netstat -a only lists connected sockets and listening socket.

  -a            Displays all connections and listening ports.

connect 和 listen 都没有在您的套接字上调用，因此它不属于 netstat -a 的范围.

Neither connect nor listen was called on your socket, so it falls outside the purview of netstat -a.

但是，从 Windows 10 开始，您可以使用 netstat -q.

However, since Windows 10, you can use netstat -q.

  -q            Displays all connections, listening ports, and bound

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