Windows上的C：綁定到免費的隨機端口並獲取端口號

Question

在Linux上，我會這樣做：

serv_addr.sin_family = AF_INET;
serv_addr.sin_addr.s_addr = INADDR_ANY;
serv_addr.sin_port = htons(0);

if (bind(sockfd, (struct sockaddr *) &serv_addr, sizeof(serv_addr)) < 0)
{
    perror("ERROR on binding");
    *err = -2;
}
struct sockaddr_in sin;
socklen_t len = sizeof(sin);

if (getsockname(sockfd, (struct sockaddr *)&sin, &len) == -1)
{
    *err = -2;
    perror("getsockname");
}

在Windows中，我有：

hints.ai_family = AF_INET;
hints.ai_socktype = SOCK_STREAM;
hints.ai_protocol = IPPROTO_TCP;
hints.ai_flags = AI_PASSIVE;
//using 0 instead of DEFAULT_PORT gives me host not found.
iResult = getaddrinfo(NULL, DEFAULT_PORT, &hints, &result); 
ListenSocket = socket(result->ai_family, result->ai_socktype, result->ai_protocol);

socklen_t len = sizeof(result->ai_addr);
printf("Port number: %d", getsockname(ListenSocket, result->ai_addr, &len));

iResult = bind( ListenSocket, result->ai_addr, (int)result->ai_addrlen);

freeaddrinfo(result);
iResult = listen(ListenSocket, 4);

謝謝

Answer 1

Windows在這里與Linux相同。

• https://msdn.microsoft.com/en-us/library/windows/desktop/ms737550(v=vs.85).aspx

您的Linux代碼不只可以在Windows上運行嗎？ 確實，除了一些特殊情況和初始化Winsock（ https://msdn.microsoft.com/zh-cn/library/windows/desktop/ms742213 ( v= vs 。 85）.aspx ）。