c# - 使用 memcpy 从 C++ 到 C#

Question

我正在写一个 arduino 和 c# 之间的流类。我使用 C++ 为 arduino 编写了它，它的工作就像一个魅力。现在，我正在尝试迁移我的代码以在 C# 上工作。

Stream::reciveObj(Stream &str, void* ptr, unsigned int Size)
{
 char data[objSize]; //Create a tmp array
 stream.readBytes(data, objSize); //Read bytes
 memcpy(ptr, data, objSize); //Copy into struct
}

现在我想将该代码迁移到 c#

unsafe public static void recieveObj(SerialPort str, void* ptr, uint Size)
{
 char[] data = new char[Size];
 str.Read(data, 0, (int)Size);
 // memcpy(ptr, data, objSize); //Copy into struct
}

如何在 C# 中创建从数组到 void* 的 memcpy

谢谢

Answer 1

这里有一个在c#中使用memcpy的方法，无耻地借用了here :

using System;
using System.Collections.Generic;
using System.Drawing;
using System.Drawing.Imaging;
using System.Linq;
using System.Reflection;
using System.Reflection.Emit;
using System.Runtime.InteropServices;
using System.Text;

namespace Test
{
public unsafe class Program
{
 public delegate void MemCpyFunction(void *des, void *src, uint bytes);

 private static readonly MemCpyFunction MemCpy;

 static Program()
 {
     var dynamicMethod = new DynamicMethod
     (
         "MemCpy",
         typeof(void),
         new [] { typeof(void *), typeof(void *), typeof(uint) },
         typeof(Program)
     );

     var ilGenerator = dynamicMethod.GetILGenerator();

     ilGenerator.Emit(OpCodes.Ldarg_0);
     ilGenerator.Emit(OpCodes.Ldarg_1);
     ilGenerator.Emit(OpCodes.Ldarg_2);

     ilGenerator.Emit(OpCodes.Cpblk);
     ilGenerator.Emit(OpCodes.Ret);

     MemCpy = (MemCpyFunction)dynamicMethod
                 .CreateDelegate(typeof(MemCpyFunction));
 }

 static void Main(string[] args)
 {
     var point1 = new Point
                  {
                      X = 10,
                      Y = 20
                  };

     var point2 = new Point();

     MemCpy(&point2, &point1, (uint)sizeof(Point));
 }
}
}