Question

我的方法“ToByte（）”是将数据转换为的正确方法字节，以便通过Udp发送？
我该如何反过来？（观看“收到的数据包构造函数”）

我应该担心收到的数据包的完整性避免例外？

public class GameDataPacket
{
    private MultiplayerService.Command command_;
    private string nickname_;
    private float x_;
    private float y_;

    public GameDataPacket()
    {
        this.command_ = MultiplayerService.Command.Nothing;
        this.nickname_ = "noname";
        this.x_ = 0.0f;
        this.y_ = 0.0f;
    }

    // Constructor for received packet
    public GameDataPacket(byte[] data)
    {
        this.command_ = (MultiplayerService.Command)BitConverter.ToInt32(data, 0);
        // How to get those values from the RECEIVED packet?
        this.nickname_ = Encoding.UTF8.GetString(data, ??, ??);
        this.x_ = BitConverter.ToSingle(data, ??); 
        this.y_ = BitConverter.ToSingle(data, ??); 
    }

如何将我的信息转换为字节：

public byte[] ToByte()
        {
            // FORMAT
            // |Command|Name|x|y|

            List<byte> result = new List<byte>();

            result.AddRange(BitConverter.GetBytes((int)command_));
            result.AddRange(Encoding.UTF8.GetBytes(nickname_));
            result.AddRange(BitConverter.GetBytes(x_));
            result.AddRange(BitConverter.GetBytes(y_));

            return result.ToArray();
        }

Answer 1

因为字符串可以是任何长度，所以您需要发送名称的长度，或者向数据包添加一些内容，以便您检测字符串的结尾。前缀长度可能是最简单和最直接的。

更新了构造函数和To-bytes方法：

    // Constructor for received packet
    public GameDataPacket(byte[] data)
    {

        int packetOffset = 0;

        this.command_ = (MultiplayerService.Command)BitConverter.ToInt32(data, packetOffset);
        packetOffset += 4;

        // read the length (in bytes) of the nickname
        int nickDataLength = BitConverter.ToInt32(data, packetOffset);
        packetOffset += 4;

        // read the nick name
        this.nickname_ = Encoding.UTF8.GetString(data, packetOffset, nickDataLength);
        packetOffset += nickDataLength;
        this.x_ = BitConverter.ToSingle(data,  packetOffset);
        packetOffset += 4;
        this.y_ = BitConverter.ToSingle(data,  packetOffset);
    }

    public byte[] ToByte()
    {
        // FORMAT
        // |Command|NameDataLength|Name|x|y|

        List<byte> result = new List<byte>();

        result.AddRange(BitConverter.GetBytes((int)command_));
        byte[] nicknameBytes = Encoding.UTF8.GetBytes(nickname_);
        result.AddRange(BitConverter.GetBytes(nicknameBytes.Length));
        result.AddRange(nicknameBytes);
        result.AddRange(BitConverter.GetBytes(x_));
        result.AddRange(BitConverter.GetBytes(y_));

        return result.ToArray();
    }

Answer 2

您可以使用BinaryFormatter ...

[Serializable]
public class MyClass
{
    public int MyProperty { get; set; }
}

// On the sending side...
var myClass = new MyClass { MyProperty = 1 };

byte[] bytes = null;
using (var ms = new MemoryStream())
{
    var bf = new BinaryFormatter();
    bf.Serialize(ms, myClass);
    bytes = ms.ToArray();
}

// On the receiving side...
MyClass other = null;
using (var ms = new MemoryStream(bytes))
{
    var bf = new BinaryFormatter();
    other = (MyClass)bf.Deserialize(ms);
}

通过UDP套接字发送一个类，这是将数据转换为字节的正确方法吗？

2 个答案: