如何转换字节数组UInt32的阵列？ [英] How do I convert byte array to UInt32 array?

问题描述

比方说在C ++中我得到了code这样的..

  void *的目标
UINT32 * decPacket =（UINT32 *）的目标;
 

因此​​，在C＃中它会像..

 字节[]的目标;
UInt32的[] decPacket =（UInt32的[]）的目标;
 

  

无法转换类型byte []为uint []

我如何把这种记忆的东西对准C ++确实给数组到C＃？

解决方案

好了，一些接近是使用<一个href=\"http://msdn.microsoft.com/en-us/library/system.buffer.blockcopy.aspx\"><$c$c>Buffer.BlockCopy:

  UINT []德codeD =新的uint [target.Length / 4];
Buffer.BlockCopy（目标，0，德codeD，0，target.Length）;
 

请注意，最后一个参数 BlockCopy 是总是的字节数，复制，不管你是复制类型。

您不能只是把一个字节数组在C＃（A UINT 阵列至少不会在安全code，我不知道在不安全code） - 但 Buffer.BlockCopy 将图示的字节的内容阵列到 UINT 阵列...而使结果根据系统的字节序来确定。就个人而言，我的不的这种做法的粉丝 - 离开code，当你移动到一个系统不同的内存布局相当容易出错。我preFER是在我的协议明确。希望它会帮助你在这种情况下，虽然。

Lets say In C++ I got code like this..

void * target
uint32 * decPacket = (uint32 *)target;

So in C# it would be like..

byte[] target;
UInt32[] decPacket = (UInt32[])target;

Cannot convert type byte[] to uint[]

How do I convert this memory aligning thing C++ does to arrays to C#?

解决方案

Well, something close would be to use Buffer.BlockCopy:

uint[] decoded = new uint[target.Length / 4];
Buffer.BlockCopy(target, 0, decoded, 0, target.Length);

Note that the final argument to BlockCopy is always the number of bytes to copy, regardless of the types you're copying.

You can't just treat a byte array as a uint array in C# (at least not in safe code; I don't know about in unsafe code) - but Buffer.BlockCopy will splat the contents of the byte array into the uint array... leaving the results to be determined based on the endianness of the system. Personally I'm not a fan of this approach - it leaves the code rather prone to errors when you move to a system with a different memory layout. I prefer to be explicit in my protocol. Hopefully it'll help you in this case though.

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