将非托管数据复制到托管数组 [英] Copy unmanaged data into managed array

问题描述

我需要使用C ++ / CLI（数组）将本地（即非托管）数据（字节*）复制到托管字节数组。

I need to copy native (i.e. unmanaged) data (byte*) to managed byte array with C++/CLI (array).

我尝试了Marshal :: Copy （数据由const void *数据指向，并且是dataSize字节）

I tried Marshal::Copy (data is pointed to by const void* data and is dataSize bytes)

array<byte>^ _Data=gcnew array<byte>(dataSize);
System::Runtime::InteropServices::Marshal::Copy((byte*)data, _Data, 0, dataSize);

这会产生错误C2665：16个重载都不能转换所有参数。然后我尝试了

This gives error C2665: none of the 16 overloads can convert all parameters. Then I tried

System::Runtime::InteropServices::Marshal::Copy(new IntPtr(data), _Data, 0, dataSize);

会产生错误C2664：参数1无法从 const void *转换为 __w64 int

which produces error C2664: parameter 1 cannot be converted from "const void*" to "__w64 int".

那么该怎么做，是否确实是元帅::抄写这样做的最佳（最简单/最快）方法？

So how can it be done and is Marshal::Copy indeed the "best" (simplest/fastest) way to do so?

推荐答案

IntPtr 只是围绕 void *的包装。您不需要新语法，只需使用显式转换运算符即可。

"IntPtr" is just a wrapper around a "void *". You shouldn't need the new syntax, just use of the explicit conversion operator.

System::Runtime::InteropServices::Marshal::Copy( IntPtr( ( void * ) data ), _Data, 0, dataSize );

应该工作。

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