MAKEWORD()函数功能

MAKEWORD()函数是一个Windows API函数，它的功能是将两个8位的字节组合成一个16位的字。它通常用于处理二进制数据，例如在读取文件或从网络接收数据时。它的语法如下：

WORD MAKEWORD(BYTE bLow, BYTE bHigh);

其中，bLow和bHigh是两个8位的字节，MAKEWORD()函数将它们组合成一个16位的字。返回值是一个WORD类型的值，表示组合后的16位字。

相关问题

windows 禁用所有网卡的ipv6功能的c++代码

以下是禁用所有网卡的IPv6功能的C++代码：

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

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

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

    // 获取网卡信息
    ULONG outBufLen = 0;
    result = GetAdaptersAddresses(AF_UNSPEC, GAA_FLAG_INCLUDE_PREFIX, nullptr, nullptr, &outBufLen);
    if (result != ERROR_BUFFER_OVERFLOW) {
        std::cerr << "GetAdaptersAddresses failed with error: " << result << std::endl;
        WSACleanup();
        return 1;
    }
    auto addresses = (IP_ADAPTER_ADDRESSES*)malloc(outBufLen);
    result = GetAdaptersAddresses(AF_UNSPEC, GAA_FLAG_INCLUDE_PREFIX, nullptr, addresses, &outBufLen);
    if (result != NO_ERROR) {
        std::cerr << "GetAdaptersAddresses failed with error: " << result << std::endl;
        free(addresses);
        WSACleanup();
        return 1;
    }

    // 禁用IPv6功能
    for (auto adapter = addresses; adapter != nullptr; adapter = adapter->Next) {
        for (auto address = adapter->FirstUnicastAddress; address != nullptr; address = address->Next) {
            if (address->Address.lpSockaddr->sa_family == AF_INET6) {
                auto sockaddr = reinterpret_cast<sockaddr_in6*>(address->Address.lpSockaddr);
                sockaddr->sin6_family = AF_UNSPEC;
                std::cout << "IPv6 disabled for adapter: " << adapter->FriendlyName << std::endl;
            }
        }
    }

    free(addresses);
    WSACleanup();
    return 0;
}

该代码使用了Windows Socket API和IP Helper API来获取网卡信息并禁用IPv6功能。具体来说，它使用GetAdaptersAddresses函数获取所有网卡的IP地址和相关信息，然后遍历每个网卡的IPv6地址并将其地址族设置为AF_UNSPEC，从而禁用IPv6功能。

在windows中用C++完成以下功能，在主函数中插入TCP socket客户端通讯函数，当程序启动时与主机通讯，当返回特定字符串后进行主函数之后的代码。主函数完成后利用TCP发送特定字符串，并关闭TCP通讯

以下是一个示例代码，实现了上述功能：

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

#pragma comment(lib, "ws2_32.lib")

#define SERVER_IP "127.0.0.1"
#define SERVER_PORT 12345
#define RESPONSE_MSG "Hello, world!"

void client_communication() {
    WSADATA wsaData;
    if (WSAStartup(MAKEWORD(2, 2), &wsaData) != 0) {
        printf("WSAStartup failed.\n");
        return;
    }

    SOCKET clientSocket = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
    if (clientSocket == INVALID_SOCKET) {
        printf("Failed to create socket.\n");
        WSACleanup();
        return;
    }

    struct sockaddr_in serverAddress;
    memset(&serverAddress, 0, sizeof(serverAddress));
    serverAddress.sin_family = AF_INET;
    serverAddress.sin_addr.s_addr = inet_addr(SERVER_IP);
    serverAddress.sin_port = htons(SERVER_PORT);

    if (connect(clientSocket, (struct sockaddr*)&serverAddress, sizeof(serverAddress)) == SOCKET_ERROR) {
        printf("Failed to connect to server.\n");
        closesocket(clientSocket);
        WSACleanup();
        return;
    }

    char buffer[1024];
    int len = recv(clientSocket, buffer, 1024, 0);
    if (len == SOCKET_ERROR) {
        printf("Failed to receive data.\n");
        closesocket(clientSocket);
        WSACleanup();
        return;
    }
    buffer[len] = '\0';
    if (strcmp(buffer, RESPONSE_MSG) != 0) {
        printf("Received unexpected response: %s\n", buffer);
        closesocket(clientSocket);
        WSACleanup();
        return;
    }

    // Do something after receiving the expected response
    printf("Received expected response: %s\n", buffer);

    // Send a message to the server
    const char* msg = "Hello from client!";
    if (send(clientSocket, msg, strlen(msg), 0) == SOCKET_ERROR) {
        printf("Failed to send data.\n");
    }

    // Close the socket and clean up
    closesocket(clientSocket);
    WSACleanup();
}

int main() {
    // Connect to server and wait for response
    client_communication();

    // Do something after the communication
    printf("Program finished.\n");

    // Send a message to the server to indicate the end of communication
    WSADATA wsaData;
    if (WSAStartup(MAKEWORD(2, 2), &wsaData) != 0) {
        printf("WSAStartup failed.\n");
        return -1;
    }

    SOCKET clientSocket = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
    if (clientSocket == INVALID_SOCKET) {
        printf("Failed to create socket.\n");
        WSACleanup();
        return -1;
    }

    struct sockaddr_in serverAddress;
    memset(&serverAddress, 0, sizeof(serverAddress));
    serverAddress.sin_family = AF_INET;
    serverAddress.sin_addr.s_addr = inet_addr(SERVER_IP);
    serverAddress.sin_port = htons(SERVER_PORT);

    if (connect(clientSocket, (struct sockaddr*)&serverAddress, sizeof(serverAddress)) == SOCKET_ERROR) {
        printf("Failed to connect to server.\n");
        closesocket(clientSocket);
        WSACleanup();
        return -1;
    }

    const char* msg = "End of communication";
    if (send(clientSocket, msg, strlen(msg), 0) == SOCKET_ERROR) {
        printf("Failed to send data.\n");
    }

    closesocket(clientSocket);
    WSACleanup();

    return 0;
}

在这个程序中，`client_communication()`函数实现了与服务器进行通讯的功能。程序启动后，它会创建一个TCP客户端socket，并尝试连接到指定的服务器地址和端口号。一旦连接成功，它会尝试接收数据，如果接收到的数据不是预期的字符串，则会退出函数并关闭socket。如果接收到的数据是预期的字符串，则会打印出来，并执行主函数中的后续代码。在主函数的最后，它会再次创建一个TCP客户端socket，并向服务器发送一个特定的字符串，以表示通讯结束。最终，它会关闭所有socket并清理资源。