为什么netstat没有列出我的socket的开放端口？

Question

如果您运行此示例,您将看到端口从未列出netstat.为什么？我怎么做到这一点？

#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();
}

Answer 1

netstat -a 仅列出已连接的套接字和侦听套接字.

  -a            Displays all connections and listening ports.

你的插座上既没有connect也没有listen被叫过,所以它不属于你的范围netstat -a.

但是,从Windows 10开始,您就可以使用了netstat -q.

  -q            Displays all connections, listening ports, and bound