读取C / C ++数据在C#中的结构,从一个字节数组 [英] Reading a C/C++ data structure in C# from a byte array
问题描述
什么是填补从byte []数组,其中的数据是从C / C ++结构一个C#结构的最佳方式是什么?在C结构会是这个样子(我的C是非常生疏):
What would be the best way to fill a C# struct from a byte[] array where the data was from a C/C++ struct? The C struct would look something like this (my C is very rusty):
typedef OldStuff {
CHAR Name[8];
UInt32 User;
CHAR Location[8];
UInt32 TimeStamp;
UInt32 Sequence;
CHAR Tracking[16];
CHAR Filler[12];
}
和将填补这样的:
[StructLayout(LayoutKind.Explicit, Size = 56, Pack = 1)]
public struct NewStuff
{
[MarshalAs(UnmanagedType.ByValTStr, SizeConst = 8)]
[FieldOffset(0)]
public string Name;
[MarshalAs(UnmanagedType.U4)]
[FieldOffset(8)]
public uint User;
[MarshalAs(UnmanagedType.ByValTStr, SizeConst = 8)]
[FieldOffset(12)]
public string Location;
[MarshalAs(UnmanagedType.U4)]
[FieldOffset(20)]
public uint TimeStamp;
[MarshalAs(UnmanagedType.U4)]
[FieldOffset(24)]
public uint Sequence;
[MarshalAs(UnmanagedType.ByValTStr, SizeConst = 16)]
[FieldOffset(28)]
public string Tracking;
}
什么是复制 OldStuff
到 Newstuff文件
,如果 OldStuff $最好的办法C $ C>获通过为byte []数组?
What is best way to copy OldStuff
to NewStuff
, if OldStuff
was passed as byte[] array?
目前,我正在做一些像下面,但感觉那种沉闷。
I'm currently doing something like the following, but it feels kind of clunky.
GCHandle handle;
NewStuff MyStuff;
int BufferSize = Marshal.SizeOf(typeof(NewStuff));
byte[] buff = new byte[BufferSize];
Array.Copy(SomeByteArray, 0, buff, 0, BufferSize);
handle = GCHandle.Alloc(buff, GCHandleType.Pinned);
MyStuff = (NewStuff)Marshal.PtrToStructure(handle.AddrOfPinnedObject(),
typeof(NewStuff));
handle.Free();
有没有更好的方式来做到这一点?
Is there better way to accomplish this?
会使用 BinaryReader在
类提供了寄托记忆和使用任何性能提升 Marshal.PtrStructure
?
Would using the BinaryReader
class offer any performance gains over pinning the memory and using Marshal.PtrStructure
?
推荐答案
从我可以在这方面看,你不需要复制SomeByteArray到缓冲区中。您只需从SomeByteArray得到处理,别起来,用PtrToStructure复制IntPtr的数据,然后松开。不需要副本。
From what I can see in that context, you don't need to copy SomeByteArray into a buffer. You simply need to get the handle from SomeByteArray, pin it, copy the IntPtr data using PtrToStructure and then release. No need for a copy.
这将是:
NewStuff ByteArrayToNewStuff(byte[] bytes)
{
GCHandle handle = GCHandle.Alloc(bytes, GCHandleType.Pinned);
NewStuff stuff = (NewStuff)Marshal.PtrToStructure(
handle.AddrOfPinnedObject(), typeof(NewStuff));
handle.Free();
return stuff;
}
通用版:
T ByteArrayToStructure<T>(byte[] bytes) where T: struct
{
GCHandle handle = GCHandle.Alloc(bytes, GCHandleType.Pinned);
T stuff = (T)Marshal.PtrToStructure(handle.AddrOfPinnedObject(),
typeof(T));
handle.Free();
return stuff;
}
...
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