C# - 将不安全的 byte* 转换为 byte[]

C# - Convert unsafe byte* to byte[]

提问by kol

I have an unsafebyte*pointing to a native byte array of known length. How can I convert it to byte[]?

我有一个unsafebyte*指向已知长度的本机字节数组。我怎样才能将它转换为byte[]？

An unsafesbyte*pointing to a zero-terminated native string can be converted to a C# stringeasily, because there is a conversion constructorfor this purpose, but I can't find a simple way to convert byte*to byte[].

一unsafesbyte*到零结尾的本地字符串指针可以被转换成一个C＃string容易，因为有一个转换构造函数用于此目的，但我不能找到一个简单的方法来转换byte*到byte[]。

采纳答案by David Heffernan

If ptris your unsafe pointer, and the array has length len, you can use Marshal.Copylike this:

如果ptr是你的不安全指针，并且数组有 length len，你可以这样使用Marshal.Copy：

byte[] arr = new byte[len];
Marshal.Copy((IntPtr)ptr, arr, 0, len);

But I do wonder how you came by an unsafe pointer to native memory. Do you really need unsafe here, or can you solve the problem by using IntPtrinstead of an unsafe pointer? And if so then there's probably no need for unsafe code at all.

但我确实想知道你是如何得到一个指向本机内存的不安全指针的。这里真的需要 unsafe 吗，还是可以用IntPtrunsafe 指针代替 unsafe 来解决问题？如果是这样，那么可能根本不需要不安全的代码。

回答by dotixx

The Marshalclass could help you.

在元帅类可以帮助你。

byte[] bytes = new byte[length];
for(int i = 0; i < length; ++i)
  bytes[i] = Marshal.ReadByte(yourPtr, i);

I think you might use Marshal.Copy too.

我想你也可以使用 Marshal.Copy 。