C#中结构体和字节数组转换实现

最近在使用结构体与字节数组转化来实现socket间数据传输。现在开始整理一下。对于marshal可以查阅msdn，关于字节数组与结构体转代码如下：

using system;
using system.collections.generic;
using system.linq;
using system.text;
using system.io;
using system.runtime.interopservices;
namespace filesendclient
{
 
  [structlayoutattribute(layoutkind.sequential, charset = charset.ansi, pack = 1)]
  struct structdemo
  {
    
    public byte a;
    public byte c;
    [marshalas(unmanagedtype.byvalarray, sizeconst = 3)]
    public byte[] b;
    public byte d;
    public int e;
    
  }
  unsafe class program
  {
    static void main(string[] args)
    {
      structdemo sd;
      sd.a = 0;
      sd.d = 0;
      sd.c = 0;
      sd.b = new byte[3] { 0, 0, 1 };
      sd.e = 5;
      int size = 0;
      //此处使用非安全代码来获取到structdemo的值
      unsafe
      {
        size = marshal.sizeof(sd);
      }
       
      byte[] b = structtobytes(sd,size);
 
      bytetostruct(b, typeof(structdemo));
 
    }
 
 
    //将byte转换为结构体类型
    public static byte[] structtobytes(object structobj,int size)
    {
      structdemo sd;
      int num = 2;
      byte[] bytes = new byte[size];
      intptr structptr = marshal.allochglobal(size);
      //将结构体拷到分配好的内存空间
      marshal.structuretoptr(structobj, structptr, false);
      //从内存空间拷贝到byte 数组
      marshal.copy(structptr, bytes, 0, size);
      //释放内存空间
      marshal.freehglobal(structptr);
      return bytes;
 
    }
 
    //将byte转换为结构体类型
    public static object bytetostruct(byte[] bytes, type type)
    {
      int size = marshal.sizeof(type);
      if (size > bytes.length)
      {
        return null;
      }
      //分配结构体内存空间
      intptr structptr = marshal.allochglobal(size);
      //将byte数组拷贝到分配好的内存空间
      marshal.copy(bytes, 0, structptr, size);
      //将内存空间转换为目标结构体
      object obj = marshal.ptrtostructure(structptr, type);
      //释放内存空间
      marshal.freehglobal(structptr);
      return obj;
    }
  }
}