C#使用tcp/ip從Minecraft服務器獲取資料包

我的主要目標是將 C# 客戶端連接到 Minecraft 服務器，但我在獲取服務器發送的資料包內容時遇到了一些麻煩。根據此頁面，Minecraft 中的資料包應匹配特定格式。（資料包的格式）

此外，根據this，字串以 is length 為前綴。

這是我想拿到的包裹。

知道這些資訊，這是我的代碼：

  //S->C : Login Success
  int packet_Length = ReadVarInt(stream);
  int packet_Id = ReadVarInt(stream);


  int uuid_length = ReadVarInt(stream);
  string uuid = ReadString(stream, 16);

  int name_length = ReadVarInt(stream);
  string name = ReadString(stream, 16);


public static int ReadVarInt(Stream stream)
    {
        int value = 0;
        int length = 0;
        int currentByte;

        while (true)
        {
            currentByte = stream.ReadByte();
            value |= (currentByte & 0x7F) << (length   * 7);
            if (length > 5) throw new IOException("VarInt too big");
            if ((currentByte & 0x80) != 0x80) break;
        }
        return value;
    }

 public static string ReadString(Stream stream, int length)
    {
        byte[] data = new byte[length];
        stream.Read(data);
        return Encoding.UTF8.GetString(data);
    }

結果：

packet_Length : 3
packet_Id : 3
uuid : ↓??v9Q??1??w??
name : 9?mc_bot

問題是資料包ID應該是 1，uuid是一個常規字串，名稱只有“ mc_bot ”作為值。我確切地說必須在完美作業之前完成的部分（我認為）因為客戶端在獲取登錄成功資料包后加入服務器，但我無法正確獲取任何資料。

謝謝 ！

uj5u.com熱心網友回復：

所以，在一些幫助下，我終于發現了我的程序出了什么問題。我想指出，老實說，通過正確閱讀檔案可以輕松避免這種型別的錯誤，而我沒有這樣做......

這是我的最終代碼

                int packet_Length = ReadVarInt(stream);
                int packet_Id = ReadVarInt(stream);

                Console.WriteLine($"packet_Length : {packet_Length}");
                Console.WriteLine($"packet_Id : {packet_Id}");

                //Enables compression. If compression is enabled,
                //all following packets are encoded in the compressed packet format.
                //Negative or zero values will disable compression,
                //meaning the packet format should remain in the uncompressed packet format.
                //However, this packet is entirely optional, and if not sent,
                //compression will also not be enabled (the notchian server does not send the packet when compression is disabled).
                if (packet_Id == 0x03)
                {
                    //S->C : Set Compression (Optional)
                    int compression_threshold = ReadVarInt(stream);
                    Console.WriteLine($"packet_Id : {packet_Id}");
                }

                //S->C : Login Success
                string uuid = ReadUUID(stream, 16);
                int name_length = ReadVarInt(stream);
                string name = ReadString(stream, name_length);
                
                Console.WriteLine($"uuid : {uuid}");
                Console.WriteLine($"name_length : {name_length}");
                Console.WriteLine($"name : {name}");
                

    public static string ReadUUID(Stream stream, int length)
    {
        byte[] data = new byte[length];

        stream.Read(data);

        ulong b1 = BitConverter.ToUInt64(data,0);
        ulong b2 = BitConverter.ToUInt64(data,8);


        byte[] bytes = new byte[0];
        bytes = bytes.Concat(BitConverter.GetBytes(b1)).Concat(BitConverter.GetBytes(b2)).ToArray();

        string uuid = "";
        foreach (byte b in bytes)
            uuid  = b.ToString("x2");

        return uuid.Substring(0, 8)   "-"   uuid.Substring(8, 4)   "-"   uuid.Substring(12, 4)   "-"   uuid.Substring(16, 4)   "-"   uuid.Substring(20, 12);
    }

public static int ReadVarInt(Stream stream)
{
    int value = 0;
    int length = 0;
    int currentByte;

    while (true)
    {
        currentByte = stream.ReadByte();
        value |= (currentByte & 0x7F) << (length   * 7);
        if (length > 5) throw new IOException("VarInt too big");
        if ((currentByte & 0x80) != 0x80) break;
    }
    return value;
}

public static string ReadString(Stream stream, int length)
{
    byte[] data = new byte[length];
    stream.Read(data);
    return Encoding.UTF8.GetString(data);
}

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