如何通过C＃语言通过TCP发送HEX代码

Question

我是C＃编程的新手，我正在尝试编写TCP客户端，该TCP客户端将通过HEAX代码将HEX代码发送到服务器，从服务器读取一些元数据。我设法与服务器但无法发送十六进制代码。请您看看我在这里缺少的东西。

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

如果我正确理解，则您的特定字节在数组data中。但是您不在代码中使用它。
看来您错过了stm.Write(data, 0, data.Length)之类的东西发送字节0xcf和0xc4

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：

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

您是否在提示下输入任何内容？如果没有，那么就不会发送任何字节。相反，如果您打算发送var data = new byte[] { 0xCF, 0xC4 };，则需要使用

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