如何以 C# 语言通过 TCP 发送十六进制代码

Question

我是 C# 编程的新手，我正在尝试编写 TCP 客户端，它将通过十六进制代码向服务器发送十六进制代码，从服务器端读取一些元数据。我设法与服务器连接，但无法发送十六进制代码.你能看看我在这里缺少什么吗？

using System;
using System.IO;
using System.Text;
using System.Net.Sockets;


public class clnt
{

public static void Main()
{

    try
    {
        TcpClient tcpclnt = new TcpClient();
        Console.WriteLine("Connecting...");

        tcpclnt.Connect("192.168.80.128", 557);
        // use the ip address as in the server program

        Console.WriteLine("Connected!");
        Console.WriteLine("Sending Hex Code...");


        string str = Console.ReadLine();
        Stream stm = tcpclnt.GetStream();


        ASCIIEncoding asen = new ASCIIEncoding();
        byte[] ba = asen.GetBytes(str);
        var data = new byte[] { 0xCF, 0xC4 };
        Console.WriteLine("Transmitting");

        stm.Write(ba, 0, ba.Length);

        byte[] bb = new byte[100];
        int k = stm.Read(bb, 0, 100);

        for (int i = 0; i < k; i++)
            Console.Write(Convert.ToChar(bb[i]));

        tcpclnt.Close();
    }

    catch (Exception e)
    {
        Console.WriteLine("Opps " + e.StackTrace);
    }
}

}


//C++ code
int main()
{
    client.Initialize("192.168.80.128", 557);

    std::this_thread::sleep_for(std::chrono::seconds(2));

    std::string xid = U8("NASA_Arnold_AFB_Airshow");

    std::vector<std::uint8_t> command = {0xCF, 0xC4};

    command.push_back(static_cast<std::uint8_t>(xid.length()));

    command.insert(command.end(), xid.begin(), xid.end());

    std::cout << command.size() << std::endl;

    client.Correspond(command, 10);

    std::this_thread::sleep_for(std::chrono::seconds(3));

    command.clear();

    command = {0xC8, 0xC3};

    std::cout << client.Response().size() << std::endl;

    std::vector<std::uint8_t> idhandle(client.Response().begin() + 2, client.Response().end());

    command.insert(command.end(), idhandle.begin(), idhandle.end());

    client.Correspond(command, 3);

    std::this_thread::sleep_for(std::chrono::seconds(3));

    for(auto element : client.Response())
        std::cout << static_cast<int>(element) << std::endl;

    std::uint8_t size = client.Response().back();

    std::cout << "size of xid:" << static_cast<int>(size) << std::endl;

    client.ReadN(size);

    std::this_thread::sleep_for(std::chrono::seconds(3));

    std::cout << std::string(client.Response().begin(), client.Response().end()) << std::endl;

    command.clear();

    command = {0xC8, 0x4A};

    command.insert(command.end(), idhandle.begin(), idhandle.end());

    std::cout << idhandle.size() << std::endl;

    for(auto element : idhandle)
        std::cout << static_cast<int>(element) << std::endl;

    client.Correspond(command, 97);

    std::this_thread::sleep_for(std::chrono::seconds(3));


    std::cout << std::string(client.Response().begin(), client.Response().end()) << std::endl;


    std::getchar();

    return 0;
}

Answer 1

如果我理解正确，您的特定字节在数组data 中。但是您不会在代码中使用它。
您似乎错过了类似 stm.Write(data, 0, data.Length) 发送字节 0xCF 和 0xC4 的内容

Answer 2

您的代码提示输入：

string str = Console.ReadLine();

然后从此输入中获取字节：

byte[] ba = asen.GetBytes(str);

最后将这些字节发送到流中：

stm.Write(ba, 0, ba.Length);

您是否在提示符处输入任何内容？如果没有，则不会有任何字节要发送。如果您打算发送 var data = new byte[] { 0xCF, 0xC4 };，那么您需要使用

stm.Write(data, 0, data.Length);