构造UDP数据包的字节数组
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【中文标题】构造UDP数据包的字节数组【英文标题】：Byte Array to Struct UDP Packet 【发布时间】：2020-06-06 16:51:46 【问题描述】：我目前正忙于我的项目。我目前从游戏中接收 UDP 数据包。这些数据包包含字节数组。这些字节数组需要转换为结构体。
我已经解决了这个问题的前一个问题： F1 2019 UDP decoding
我已经完成了其中的一部分工作。我使用此代码将字节数组转换为结构：
PacketHeader ByteArrayToPacketHeader(byte[] bytes)
GCHandle handle = GCHandle.Alloc(bytes, GCHandleType.Pinned);
PacketHeader stuff;
try
stuff = (PacketHeader)Marshal.PtrToStructure(handle.AddrOfPinnedObject(), typeof(PacketHeader));
finally
handle.Free();
return stuff;
我的数据包头（结构）看起来像这样：
public struct PacketHeader
public ushort m_packetFormat; // 2019
public byte m_gameMajorVersion; // Game major version - "X.00"
public byte m_gameMinorVersion; // Game minor version - "1.XX"
public byte m_packetVersion; // Version of this packet type, all start from 1
public byte m_packetId; // Identifier for the packet type, see below
public ulong m_sessionUID; // Unique identifier for the session
public float m_sessionTime; // Session timestamp
public uint m_frameIdentifier; // Identifier for the frame the data was retrieved on
public byte m_playerCarIndex; // Index of player's car in the array
;
通过这段代码，我得到了正确的信息。所以这行得通！
游戏通过同一个字节数组发送多个“包”（Structs）。
但是当我使用相同的代码将字节数组转换为新的结构布局时，我没有从数组中得到正确的信息。 示例：
PacketCarTelemetryData ByteArrayToPacketCarTelemetryData(byte[] bytes)
GCHandle handle = GCHandle.Alloc(bytes, GCHandleType.Pinned);
PacketCarTelemetryData stuff;
try
stuff = (PacketCarTelemetryData)Marshal.PtrToStructure(handle.AddrOfPinnedObject(), typeof(PacketCarTelemetryData));
finally
handle.Free();
return stuff;
此代码使用此结构布局：
public struct PacketCarTelemetryData
public PacketHeader m_header; // Header
public CarTelemetryData m_carTelemetryData;
public uint m_buttonStatus; // Bit flags specifying which buttons are being pressed
// currently - see appendices
;
在上面的结构中还存储了其他结构：
public struct CarTelemetryData
public ushort m_speed; // Speed of car in kilometres per hour
public float m_throttle; // Amount of throttle applied (0.0 to 1.0)
public float m_steer; // Steering (-1.0 (full lock left) to 1.0 (full lock right))
public float m_brake; // Amount of brake applied (0.0 to 1.0)
public byte m_clutch; // Amount of clutch applied (0 to 100)
public sbyte m_gear; // Gear selected (1-8, N=0, R=-1)
public ushort m_engineRPM; // Engine RPM
public byte m_drs; // 0 = off, 1 = on
public byte m_revLightsPercent; // Rev lights indicator (percentage)
public ushort m_brakesTemperature; // Brakes temperature (celsius)
public ushort m_tyresSurfaceTemperature; // Tyres surface temperature (celsius)
public ushort m_tyresInnerTemperature; // Tyres inner temperature (celsius)
public ushort m_engineTemperature; // Engine temperature (celsius)
public float tyresPressure; // Tyres pressure (PSI)
public byte m_surfaceType; // Driving surface, see appendice
;
所以我现在的问题是，当我使用此代码将字节数组转换为此特定结构时，我没有得到我想要的信息。
附：车里没有36档，我的刹车也不是21760摄氏度……
有人有什么建议吗？
致以诚挚的问候，
编辑：
有关更多信息，这是我想读取数据包 CarTelemetryData 时得到的十六进制代码：
E3-07-01-15-01-06-F8-CE-BE-09-64-7F-EA-D1-DC-A1-16-41-91-01-00-00-13-7B-00-00-00-80-3F-36-53-7E-3C-00-00-00-00-00-02-F3-2F-00-64-1D-00-1D-00-1D-00-1D-00-74-00-74-00-4F-00-4F-00-5B-00-5B-00-58-00-58-00-5A-00-00-00-AC-41-00-00-AC-41-00-00-B8-41-00-00-B8-41-00-00-00-00-74-00-00-00-80-3F-1B-F2-3A-3C-00-00-00-00-00-02-35-2D-00-22-1D-00-1D-00-1D-00-1D-00-69-00-69-00-4F-00-4F-00-5A-00-5A-00-58-00-58-00-5A-00-00-00-AC-41-00-00-AC-41-00-00-B8-41-00-00-B8-41-00-00-00-00-7B-00-00-00-80-3F-F3-59-A1-BA-00-00-00-00-00-02-59-2F-00-64-1D-00-1D-00-1D-00-1D-00-72-00-72-00-4F-00-4F-00-5A-00-5A-00-58-00-58-00-5A-00-00-00-AC-41-00-00-AC-41-00-00-B8-41-00-00-B8-41-00-00-00-00-77-00-00-00-80-3F-FE-5F-3F-3C-00-00-00-00-00-02-3D-2E-00-3E-1D-00-1D-00-1D-00-1D-00-71-00-71-00-4F-00-4F-00-5A-00-5A-00-58-00-58-00-5A-00-00-00-AC-41-00-00-AC-41-00-00-B8-41-00-00-B8-41-00-00-00-00-81-00-00-00-80-3F-89-78-23-3C-00-00-00-00-00-03-E0-28-00-00-1D-00-1D-00-1D-00-1D-00-77-00-78-00-4F-00-4F-00-5B-00-5B-00-58-00-58-00-5A-00-00-00-AC-41-00-00-AC-41-00-00-B8-41-00-00-B8-41-00-00-00-00-77-00-00-00-80-3F-C3-73-98-3C-00-00-00-00-00-02-2F-2E-00-54-1D-00-1D-00-1D-00-1D-00-75-00-75-00-50-00-4F-00-5B-00-5B-00-58-00-58-00-5A-00-00-00-AC-41-00-00-AC-41-00-00-B8-41-00-00-B8-41-00-00-00-00-76-00-00-00-80-3F-F3-F4-BA-BA-00-00-00-00-00-02-21-2E-00-59-1D-00-1D-00-1D-00-1D-00-75-00-75-00-4F-00-4F-00-5B-00-5B-00-58-00-58-00-5A-00-00-00-AC-41-00-00-AC-41-00-00-B8-41-00-00-B8-41-00-00-00-00-7C-00-00-00-80-3F-4D-7D-04-3B-00-00-00-00-00-02-FB-2F-00-64-1D-00-1D-00-1D-00-1D-00-70-00-70-00-4F-00-4F-00-5A-00-5A-00-58-00-58-00-5A-00-00-00-AC-41-00-00-AC-41-00-00-B8-41-00-00-B8-41-00-00-00-00-75-00-00-00-80-3F-84-45-AB-3C-00-00-00-00-00-02-BF-2D-00-31-1D-00-1D-00-1D-00-1D-00-77-00-77-00-4F-00-4F-00-5B-00-5B-00-58-00-58-00-5A-00-00-00-AC-41-00-00-AC-41-00-00-B8-41-00-00-B8-41-00-00-00-00-80-00-00-00-80-3F-B5-8C-BD-3B-00-00-00-00-00-03-1B-28-00-00-1D-00-1D-00-1D-00-1D-00-71-00-71-00-4F-00-4F-00-5A-00-5A-00-58-00-58-00-5A-00-00-00-AC-41-00-00-AC-41-00-00-B8-41-00-00-B8-41-00-00-00-00-72-00-00-00-80-3F-F8-D0-87-3A-00-00-00-00-00-02-63-2C-00-37-1D-00-1D-00-1D-00-1D-00-79-00-79-00-4F-00-4F-00-5B-00-5B-00-58-00-58-00-5A-00-00-00-AC-41-00-00-AC-41-00-00-B8-41-00-00-B8-41-00-00-00-00-7B-00-00-00-80-3F-FF-A7-60-3A-00-00-00-00-00-02-DE-2F-00-64-1D-00-1D-00-1D-00-1D-00-6E-00-6E-00-4F-00-4F-00-5A-00-5A-00-58-00-58-00-5A-00-00-00-AC-41-00-00-AC-41-00-00-B8-41-00-00-B8-41-00-00-00-00-7A-00-00-00-80-3F-B9-2E-2F-3C-00-00-00-00-00-02-D1-2F-00-64-1D-00-1D-00-1D-00-1D-00-75-00-75-00-4F-00-4F-00-5B-00-5B-00-58-00-58-00-5A-00-00-00-AC-41-00-00-AC-41-00-00-B8-41-00-00-B8-41-00-00-00-00-74-00-00-00-80-3F-CD-1E-18-3A-00-00-00-00-00-02-3F-2D-00-23-1D-00-1D-00-1D-00-1D-00-6F-00-6F-00-4F-00-4F-00-5A-00-5A-00-58-00-58-00-5A-00-00-00-AC-41-00-00-AC-41-00-00-B8-41-00-00-B8-41-00-00-00-00-73-00-00-00-80-3F-15-0F-AF-3B-00-00-00-00-00-02-A5-2B-00-0C-1D-00-1D-00-1D-00-1D-00-70-00-70-00-4F-00-4F-00-5A-00-5A-00-58-00-58-00-5A-00-00-00-AC-41-00-00-AC-41-00-00-B8-41-00-00-B8-41-00-00-00-00-7A-00-00-00-80-3F-2B-C0-14-3C-00-00-00-00-00-02-49-2F-00-64-1D-00-1D-00-1D-00-1D-00-6F-00-6F-00-4F-00-4F-00-5A-00-5A-00-58-00-58-00-5A-00-00-00-AC-41-00-00-AC-41-00-00-B8-41-00-00-B8-41-00-00-00-00-7F-00-00-00-80-3F-41-CA-C0-3C-00-00-00-00-00-03-85-2B-00-64-1D-00-1D-00-1D-00-1D-00-79-00-79-00-4F-00-4F-00-5B-00-5B-00-58-00-58-00-5A-00-00-00-AC-41-00-00-AC-41-00-00-B8-41-00-00-B8-41-00-00-00-00-72-00-00-00-80-3F-07-1F-D5-3C-00-00-00-00-00-02-DE-2A-00-00-1D-00-1D-00-1D-00-1D-00-78-00-78-00-4F-00-4F-00-5B-00-5B-00-58-00-58-00-5A-00-00-00-AC-41-00-00-AC-41-00-00-B8-41-00-00-B8-41-00-00-00-00-71-00-00-00-80-3F-DD-C0-1C-3C-00-00-00-00-00-02-DD-2A-00-00-1D-00-1D-00-1D-00-1D-00-6F-00-6F-00-4F-00-4F-00-5A-00-5A-00-58-00-58-00-5A-00-00-00-AC-41-00-00-AC-41-00-00-B8-41-00-00-B8-41-00-00-00-00-31-00-97-96-96-3E-00-00-00-00-00-00-00-00-00-01-9B-17-00-00-1D-00-1D-00-1D-00-1D-00-62-00-62-00-4F-00-4F-00-59-00-59-00-58-00-58-00-5A-00-CD-CC-A8-41-CD-CC-A8-41-33-33-BB-41-33-33-BB-41-00-00-00-00-00-00-00-00
我知道根据这些信息，以下数字与游戏中发生的情况不符：
当前档位应该是： 1. 这是我知道的一个事实。
重飞百分比应低于 100%
温度应该低很多，
RPM 太高了（可能在 10000 左右是正常的）。
我希望这些信息就足够了。
【问题讨论】：
数据的字节序是什么？你是如何序列化这些数据的？是相反的相同代码吗？基本上，我担心填充； PacketHeader 的大小是 32，但您可能期望 23 还是什么？对吗？ @MarcGravell 感谢您的快速回复！我所知道的是他们在 LittleEndian 中解码数组。我知道这意味着什么，但不知道如何处理它。我也不知道序列化是什么。我对此有点陌生...如果您不介意我想了解更多信息，因此如果您可以稍微解释一下或将我引导到可以了解它的某个网页，我会真的很感激。亲切的问候， 很多桌面 CPU 也是 little-endian，所以：它可以工作吗？你有一个我可以在这里查看的示例有效负载，十六进制和预期值。碰巧，这是我的专业领域。 @MarcGravell 我会尽快将十六进制发送给您，但我不明白预期值。我只是得到一大行十六进制代码，所有信息都存储在那里。至于你在下面的回答，我已经让 packetheader 工作了，但其余的都没有。 我很乐意帮助您尝试解决这个问题，但是：这是 1347 字节 - 这是什么意思？一个标头和一个遥测？大量的标题和遥测一个接一个？一个标题和很多遥测？它对于每个人来说都太大了...帮助我了解我在这里看到的内容 【参考方案1】：假设这是与填充有关的布局问题，您可以使用显式字段布局将字段放置在您期望的位置。但是，如果还存在 endianness 问题，则会更加复杂。如果我们忽略字节顺序，也许：
[StructLayout(LayoutKind.Explicit, Pack = 0, Size = 23)]
public struct PacketHeader
public static PacketHeader Read(ReadOnlySpan<byte> bytes)
=> MemoryMarshal.Cast<byte, PacketHeader>(bytes)[0];
public void Write(Span<byte> bytes)
=> MemoryMarshal.Cast<byte, PacketHeader>(bytes)[0] = this;
[FieldOffset(0)]
public ushort m_packetFormat; // 2019
[FieldOffset(2)]
public byte m_gameMajorVersion; // Game major version - "X.00"
[FieldOffset(3)]
public byte m_gameMinorVersion; // Game minor version - "1.XX"
[FieldOffset(4)]
public byte m_packetVersion; // Version of this packet type, all start from 1
[FieldOffset(5)]
public byte m_packetId; // Identifier for the packet type, see below
[FieldOffset(6)]
public ulong m_sessionUID; // Unique identifier for the session
[FieldOffset(14)]
public float m_sessionTime; // Session timestamp
[FieldOffset(18)]
public uint m_frameIdentifier; // Identifier for the frame the data was retrieved on
[FieldOffset(22)]
public byte m_playerCarIndex; // Index of player's car in the array
;
还要注意这里使用MemoryMarshal，这使得强制转换更容易。 byte[] 可以被视为一个跨度。
【讨论】：
【参考方案2】：我们来了；这里有几件事要看；首先是规范中的[4] 等是指这些东西的固定数量，而不是其中一个 - 查看轮胎温度等；现在，您可以在 C# 中使用 fixed 缓冲区来执行此操作，但是使用起来真的很痛苦，因为它需要 unsafe 代码，所以我只使用了一些自定义四边形类型；我还明确列出了所有结构。我没有将标题读取两次，而是将其按顺序解析为 20 个汽车实例。
结果：占所有字节；演示代码。
using System;
using System.Runtime.CompilerServices;
using System.Runtime.InteropServices;
[StructLayout(LayoutKind.Explicit, Pack = 0, Size = 23)]
public struct PacketHeader
[FieldOffset(0)]
public ushort m_packetFormat; // 2019
[FieldOffset(2)]
public byte m_gameMajorVersion; // Game major version - "X.00"
[FieldOffset(3)]
public byte m_gameMinorVersion; // Game minor version - "1.XX"
[FieldOffset(4)]
public byte m_packetVersion; // Version of this packet type, all start from 1
[FieldOffset(5)]
public PacketType m_packetId; // Identifier for the packet type, see below
[FieldOffset(6)]
public ulong m_sessionUID; // Unique identifier for the session
[FieldOffset(14)]
public float m_sessionTime; // Session timestamp
[FieldOffset(18)]
public uint m_frameIdentifier; // Identifier for the frame the data was retrieved on
[FieldOffset(22)]
public byte m_playerCarIndex; // Index of player's car in the array
;
public enum PacketType : byte
Motion = 0, // Contains all motion data for player’s car – only sent while player is in control
Session = 1,// Data about the session – track, time left
LapData = 2,// Data about all the lap times of cars in the session
Event = 3, // Various notable events that happen during a session
Participants = 4, // List of participants in the session, mostly relevant for multiplayer
CarSetups = 5, // Packet detailing car setups for cars in the race
CarTelemetry = 6, // Telemetry data for all cars
CarStatus = 7 // Status data for all cars such as damage
[StructLayout(LayoutKind.Explicit, Pack = 0, Size = 63)]
public struct CarTelemetryData
[FieldOffset(0)]
public ushort m_speed; // Speed of car in kilometres per hour
[FieldOffset(2)]
public float m_throttle; // Amount of throttle applied (0.0 to 1.0)
[FieldOffset(6)]
public float m_steer; // Steering (-1.0 (full lock left) to 1.0 (full lock right))
[FieldOffset(10)]
public float m_brake; // Amount of brake applied (0.0 to 1.0)
[FieldOffset(14)]
public byte m_clutch; // Amount of clutch applied (0 to 100)
[FieldOffset(15)]
public sbyte m_gear; // Gear selected (1-8, N=0, R=-1)
[FieldOffset(16)]
public ushort m_engineRPM; // Engine RPM
[FieldOffset(18)]
public byte m_drs; // 0 = off, 1 = on
[FieldOffset(19)]
public byte m_revLightsPercent; // Rev lights indicator (percentage)
[FieldOffset(20)]
public UInt16Quad m_brakesTemperature; // Brakes temperature (celsius)
[FieldOffset(28)]
public UInt16Quad m_tyresSurfaceTemperature; // Tyres surface temperature (celsius)
[FieldOffset(36)]
public UInt16Quad m_tyresInnerTemperature; // Tyres inner temperature (celsius)
[FieldOffset(44)]
public ushort m_engineTemperature; // Engine temperature (celsius)
[FieldOffset(46)]
public SingleQuad tyresPressure; // Tyres pressure (PSI)
[FieldOffset(62)]
public ByteQuad m_surfaceType; // Driving surface, see appendice
;
[StructLayout(LayoutKind.Explicit, Pack = 0, Size = 8)]
public struct UInt16Quad
[FieldOffset(0)]
public ushort A;
[FieldOffset(2)]
public ushort B;
[FieldOffset(6)]
public ushort C;
[FieldOffset(6)]
public ushort D;
[StructLayout(LayoutKind.Explicit, Pack = 0, Size = 16)]
public struct SingleQuad
[FieldOffset(0)]
public float A;
[FieldOffset(4)]
public float B;
[FieldOffset(8)]
public float C;
[FieldOffset(12)]
public float D;
[StructLayout(LayoutKind.Explicit, Pack = 0, Size = 4)]
public struct ByteQuad
[FieldOffset(0)]
public byte A;
[FieldOffset(1)]
public byte B;
[FieldOffset(2)]
public byte C;
[FieldOffset(3)]
public byte D;
static class P
static void Main()
Console.WriteLine(Unsafe.SizeOf<PacketHeader>());
Console.WriteLine(Unsafe.SizeOf<CarTelemetryData>());
Console.WriteLine(bytes.Length);
ReadOnlySpan<byte> remaining = bytes;
var header = MemoryMarshal.Cast<byte, PacketHeader>(remaining)[0];
remaining = remaining.Slice(Unsafe.SizeOf<PacketHeader>());
Console.WriteLine($"header.m_packetFormat header.m_gameMajorVersion, header.m_gameMinorVersion: header.m_packetId");
switch (header.m_packetId)
case PacketType.CarTelemetry:
// we expect 20*CarTelemetryData, then a uint of the buttons
// note we *could* use a fixed buffer for this, but... that's really very
// awkward to work with; let's try this instead
int carIndex = 0;
foreach (var telemetry in MemoryMarshal.Cast<byte, CarTelemetryData>(remaining).Slice(0, 20))
Console.WriteLine($"car: carIndex, speed: telemetry.m_speed, throttle: telemetry.m_throttle");
var temps = telemetry.m_tyresInnerTemperature;
Console.WriteLine($" type temps: temps.A/temps.B/temps.C/temps.D");
remaining = remaining.Slice(20 * Unsafe.SizeOf<CarTelemetryData>());
var buttons = MemoryMarshal.Cast<byte, uint>(remaining)[0];
Console.WriteLine($"Buttons: buttons");
remaining = remaining.Slice(sizeof(uint));
Console.WriteLine($"Unaccounted for: remaining.Length");
break;
static readonly byte[] bytes = new byte[]
0xE3, 0x07, 0x01, 0x15, 0x01, 0x06, 0xF8, 0xCE, 0xBE, 0x09, 0x64, 0x7F, 0xEA, 0xD1, 0xDC, 0xA1, 0x16, 0x41, 0x91, 0x01, 0x00, 0x00, 0x13, 0x7B, 0x00, 0x00, 0x00, 0x80, 0x3F, 0x36, 0x53, 0x7E, 0x3C, 0x00, 0x00, 0x00, 0x00, 0x00, 0x02, 0xF3, 0x2F, 0x00, 0x64, 0x1D, 0x00, 0x1D, 0x00, 0x1D, 0x00, 0x1D, 0x00, 0x74, 0x00, 0x74, 0x00, 0x4F, 0x00, 0x4F, 0x00, 0x5B, 0x00, 0x5B, 0x00, 0x58, 0x00, 0x58, 0x00, 0x5A, 0x00, 0x00, 0x00, 0xAC, 0x41, 0x00, 0x00, 0xAC, 0x41, 0x00, 0x00, 0xB8, 0x41, 0x00, 0x00, 0xB8, 0x41, 0x00, 0x00, 0x00, 0x00, 0x74, 0x00, 0x00, 0x00, 0x80, 0x3F, 0x1B, 0xF2, 0x3A, 0x3C, 0x00, 0x00, 0x00, 0x00, 0x00, 0x02, 0x35, 0x2D, 0x00, 0x22, 0x1D, 0x00, 0x1D, 0x00, 0x1D, 0x00, 0x1D, 0x00, 0x69, 0x00, 0x69, 0x00, 0x4F, 0x00, 0x4F, 0x00, 0x5A, 0x00, 0x5A, 0x00, 0x58, 0x00, 0x58, 0x00, 0x5A, 0x00, 0x00, 0x00, 0xAC, 0x41, 0x00, 0x00, 0xAC, 0x41, 0x00, 0x00, 0xB8, 0x41, 0x00, 0x00, 0xB8, 0x41, 0x00, 0x00, 0x00, 0x00, 0x7B, 0x00, 0x00, 0x00, 0x80, 0x3F, 0xF3, 0x59, 0xA1, 0xBA, 0x00, 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0x00, 0xAC, 0x41, 0x00, 0x00, 0xAC, 0x41, 0x00, 0x00, 0xB8, 0x41, 0x00, 0x00, 0xB8, 0x41, 0x00, 0x00, 0x00, 0x00, 0x72, 0x00, 0x00, 0x00, 0x80, 0x3F, 0xF8, 0xD0, 0x87, 0x3A, 0x00, 0x00, 0x00, 0x00, 0x00, 0x02, 0x63, 0x2C, 0x00, 0x37, 0x1D, 0x00, 0x1D, 0x00, 0x1D, 0x00, 0x1D, 0x00, 0x79, 0x00, 0x79, 0x00, 0x4F, 0x00, 0x4F, 0x00, 0x5B, 0x00, 0x5B, 0x00, 0x58, 0x00, 0x58, 0x00, 0x5A, 0x00, 0x00, 0x00, 0xAC, 0x41, 0x00, 0x00, 0xAC, 0x41, 0x00, 0x00, 0xB8, 0x41, 0x00, 0x00, 0xB8, 0x41, 0x00, 0x00, 0x00, 0x00, 0x7B, 0x00, 0x00, 0x00, 0x80, 0x3F, 0xFF, 0xA7, 0x60, 0x3A, 0x00, 0x00, 0x00, 0x00, 0x00, 0x02, 0xDE, 0x2F, 0x00, 0x64, 0x1D, 0x00, 0x1D, 0x00, 0x1D, 0x00, 0x1D, 0x00, 0x6E, 0x00, 0x6E, 0x00, 0x4F, 0x00, 0x4F, 0x00, 0x5A, 0x00, 0x5A, 0x00, 0x58, 0x00, 0x58, 0x00, 0x5A, 0x00, 0x00, 0x00, 0xAC, 0x41, 0x00, 0x00, 0xAC, 0x41, 0x00, 0x00, 0xB8, 0x41, 0x00, 0x00, 0xB8, 0x41, 0x00, 0x00, 0x00, 0x00, 0x7A, 0x00, 0x00, 0x00, 0x80, 0x3F, 0xB9, 0x2E, 0x2F, 0x3C, 0x00, 0x00, 0x00, 0x00, 0x00, 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0x41, 0x00, 0x00, 0xAC, 0x41, 0x00, 0x00, 0xB8, 0x41, 0x00, 0x00, 0xB8, 0x41, 0x00, 0x00, 0x00, 0x00, 0x7A, 0x00, 0x00, 0x00, 0x80, 0x3F, 0x2B, 0xC0, 0x14, 0x3C, 0x00, 0x00, 0x00, 0x00, 0x00, 0x02, 0x49, 0x2F, 0x00, 0x64, 0x1D, 0x00, 0x1D, 0x00, 0x1D, 0x00, 0x1D, 0x00, 0x6F, 0x00, 0x6F, 0x00, 0x4F, 0x00, 0x4F, 0x00, 0x5A, 0x00, 0x5A, 0x00, 0x58, 0x00, 0x58, 0x00, 0x5A, 0x00, 0x00, 0x00, 0xAC, 0x41, 0x00, 0x00, 0xAC, 0x41, 0x00, 0x00, 0xB8, 0x41, 0x00, 0x00, 0xB8, 0x41, 0x00, 0x00, 0x00, 0x00, 0x7F, 0x00, 0x00, 0x00, 0x80, 0x3F, 0x41, 0xCA, 0xC0, 0x3C, 0x00, 0x00, 0x00, 0x00, 0x00, 0x03, 0x85, 0x2B, 0x00, 0x64, 0x1D, 0x00, 0x1D, 0x00, 0x1D, 0x00, 0x1D, 0x00, 0x79, 0x00, 0x79, 0x00, 0x4F, 0x00, 0x4F, 0x00, 0x5B, 0x00, 0x5B, 0x00, 0x58, 0x00, 0x58, 0x00, 0x5A, 0x00, 0x00, 0x00, 0xAC, 0x41, 0x00, 0x00, 0xAC, 0x41, 0x00, 0x00, 0xB8, 0x41, 0x00, 0x00, 0xB8, 0x41, 0x00, 0x00, 0x00, 0x00, 0x72, 0x00, 0x00, 0x00, 0x80, 0x3F, 0x07, 0x1F, 0xD5, 0x3C, 0x00, 0x00, 0x00, 0x00, 0x00, 0x02, 0xDE, 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【讨论】：
以上是关于构造UDP数据包的字节数组的主要内容，如果未能解决你的问题，请参考以下文章
需要将字节数组/二进制消息从 UDP DatagramPacket 转换为 java 中的几个字段