c++ - 尝试控制Philips Hue Lights时，未从桥接器获得任何响应

Question

我试图编写一些C++代码来控制我的Philips Hue灯。在使用浏览器调试工具找出网桥的IP并添加了一个用户来控制灯光之后，我尝试用代码复制浏览器发送的消息以创建自己的例程。
这是我正在使用的代码:

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

#pragma comment(lib, "Ws2_32.lib")
#define PORT "80"

int main() {
    const char* adress = "192.168.178.x";

    // Initializing Winsock
    WSADATA wsaData;

    int iResult = WSAStartup(MAKEWORD(2, 2), &wsaData); //MAKEWORD(2, 2) specifies the version
    if (iResult != 0)
    {
        printf("WSAStartup failed: %d\n", iResult);
        return 1;
    }

    // Data structure to hold info for the socket
    struct addrinfo *result = NULL,
                    *ptr = NULL,
                    hints;

    ZeroMemory(&hints, sizeof(hints));
    hints.ai_family = AF_INET; // Only using IPv4 adresses
    hints.ai_socktype = SOCK_STREAM; // TCP socket
    hints.ai_protocol = IPPROTO_TCP;

    // Converting adress to readable format and stuffing it into result.
    iResult = getaddrinfo(adress, PORT, &hints, &result);
    if (iResult != 0)
    {
        printf("getaddrinfo failed: %d\n", iResult);
        WSACleanup();
        return 1;
    }

    // Actually creating a socket
    SOCKET ConnectSocket = INVALID_SOCKET;

    ptr = result;

    // Creating socket with previously initialized data
    ConnectSocket = socket(ptr->ai_family, ptr->ai_socktype, ptr->ai_protocol);
    if (ConnectSocket == INVALID_SOCKET)
    {
        printf("Error at socket(): %ld\n", WSAGetLastError());
        freeaddrinfo(result);
        WSACleanup();
        return 1;
    }

    // Connecting to the server socket
    iResult = connect(ConnectSocket, ptr->ai_addr, (int)ptr->ai_addrlen);

    // Error checking
    if (iResult == SOCKET_ERROR)
    {
        closesocket(ConnectSocket);
        ConnectSocket = INVALID_SOCKET;
    }

    freeaddrinfo(result);

    if (ConnectSocket == INVALID_SOCKET)
    {
        printf("Unable to connect to server!\n");
        WSACleanup();
        return 1;
    }


    /////////////////////////////////////////////////////////
    // ACTUAL MESSAGE
    std::string request = "GET /api/<username>/lights/2 HTTP/1.1\r\n";
    request.append("Host: 192.168.178.x\r\n");
    request.append("\r\n");

    ////////////////////////////////////////////////////////

    printf("Request:\n%s", request.c_str());

    // Send message
    iResult = send(ConnectSocket, request.c_str(),(int) request.size(), 0);

    // Error check
    if (iResult == SOCKET_ERROR)
    {
        printf("send failed: %d\n", WSAGetLastError());
        closesocket(ConnectSocket);
        WSACleanup();
        return 1;
    }

    printf("Bytes Sent: %ld\n", iResult);

    // Shutting down socket since it won't be used anymore (can still receive data)
    iResult = shutdown(ConnectSocket, SD_SEND);
    if (iResult == SOCKET_ERROR)
    {
        printf("shutdown failed: %d\n", WSAGetLastError());
        closesocket(ConnectSocket);
        WSACleanup();
        return 1;
    }

    const int buflen = 8196;
    char recvbuf[buflen];
    ZeroMemory(recvbuf, buflen);

    // Keep socket open until connection is closed
    do
    {
        iResult = recv(ConnectSocket, recvbuf, buflen, 0);
        if (iResult > 0)
        {
            printf("Bytes received: %d\n", iResult);
            printf("\nResponse:\n%s\n", recvbuf);
        }
        else if (iResult == 0)
        {
            printf("Connection closed\n");
        }
        else
        {
            printf("recv failed: %d\n", WSAGetLastError());
        }
    } while (iResult > 0);

    closesocket(ConnectSocket);
    WSACleanup();

    return 0;
}

如果查看此问题的编辑历史记录，您会发现我以前认为我的HTTP消息有问题，但是发现了一些奇怪的行为:
每次重新启动系统后，我第一次发送消息时都会得到正确的响应。但随后的所有尝试都会导致立即关闭连接。
仍然不知道是什么原因造成的，但是我想某些东西没有正确关闭或终止？

Answer 1

经过一番尝试和错误后，我发现了一些使之起作用的方法。
如果我把这一部分:

iResult = shutdown(ConnectSocket, SD_SEND);
    if (iResult == SOCKET_ERROR)
    {
        printf("shutdown failed: %d\n", WSAGetLastError());
        closesocket(ConnectSocket);
        WSACleanup();
        return 1;
    }

在接收消息的部分之后，它可以工作。
我的猜测是，尽管文档说套接字在关闭后仍然可以接收消息，但是它做出了一些更改，使服务器认为应该关闭连接。
不知道那是否正确。
如果有人知道实际原因，请随时添加评论。
我很高兴我不必再处理这个了。