如何在C#中将byte []数组加载到结构中? [英] How do I load a byte[] array into a structure in C#?

问题描述

考虑以下结构，其中username和password的长度均为17:

Consider following structure where the length of both username and password is 17:

struct LoginPacket
{
    public int unk1;
    public string username;
    public string password;
}

也是这个字节数组

00 00 00 00 6A 6D 32 6D 65 00 72 00 7A 76 72 00 98 FD 18 00 A0 68 65 72 65 49 73
70 61 73 73 00 00 00 00 00 FF FF 31 2E 30 30 2E 30 30 00 00 00 C7 9D 72 00 04 00
00 31 2E 31 30 2E 32 37 00 0C 2C F6 24 16 2C F6 24 16

是否可以将此字节数组加载到上述结构中?有一个叫Marshal的东西，但是对我来说不太有用.

Is it possible to load this byte array into the above structure? There is something called Marshal, but it doesn't quite work for me.

推荐答案

在这里，此答案使用.NET中的编组系统.该结构本身包含有关如何解密字节数组的方法.如果无法执行此操作，则需要手动代码.

Here you are, this answer uses the marshalling system in .NET. The structure itself contains the recipe on how to decipher a byte array. If you can't do that, you need manual code.

void Main()
{
    byte[] bytes = new byte[]
    {
        0x00, 0x00, 0x00, 0x00, 0x6A, 0x6D, 0x32, 0x6D, 0x65, 0x00, 0x72, 0x00, 0x7A, 0x76, 0x72, 0x00, 0x98, 0xFD, 0x18, 0x00, 0xA0, 0x68, 0x65, 0x72, 0x65, 0x49, 0x73,
        0x70, 0x61, 0x73, 0x73, 0x00, 0x00, 0x00, 0x00, 0x00, 0xFF, 0xFF, 0x31, 0x2E, 0x30, 0x30, 0x2E, 0x30, 0x30, 0x00, 0x00, 0x00, 0xC7, 0x9D, 0x72, 0x00, 0x04, 0x00,
        0x00, 0x31, 0x2E, 0x31, 0x30, 0x2E, 0x32, 0x37, 0x00, 0x0C, 0x2C, 0xF6, 0x24, 0x16, 0x2C, 0xF6, 0x24, 0x16
    };

    var packet = BytesToStructure<LoginPacket>(bytes);
    packet.Dump();
}

static T BytesToStructure<T>(byte[] bytes)
{
    int size = Marshal.SizeOf(typeof(T));
    if (bytes.Length < size)
        throw new Exception("Invalid parameter");

    IntPtr ptr = Marshal.AllocHGlobal(size);
    try
    {
        Marshal.Copy(bytes, 0, ptr, size);
        return (T)Marshal.PtrToStructure(ptr, typeof(T));
    }
    finally
    {
        Marshal.FreeHGlobal(ptr);
    }
}

[StructLayout(LayoutKind.Sequential, Pack = 1, CharSet=CharSet.Ansi)]
struct LoginPacket
{
    public int unk1;

    [MarshalAs(UnmanagedType.ByValTStr, SizeConst=17)]
    public string username;
    [MarshalAs(UnmanagedType.ByValTStr, SizeConst=17)]
    public string password;
}

在 LINQPad 中执行时，您会得到以下提示:

When executed in LINQPad you get this:

unk1: 0 
username: jm2me 
password: hereIspass

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