如何将一个二进制blob从C ++传递到C＃？ [英] How can I pass a binary blob from C++ to C#?

问题描述

我主要是一个C＃开发（从大学起不是很多C ++），但是工作将一个大量的现有C ++代码集成到一个应用程序中。我有一个C ++ / CLI程序集，缓冲两个世界，从C＃通过到C ++工作正常。我有的问题是，C ++类有一个方法调用，生成一个二进制blob（在C＃世界中的数组 byte ），我需要在C＃过程（像一个坚实的袋子传递）。

我正在寻找的是如何处理两个世界之间的缓冲区/包装器方法（C ++ / CLI）的建议。我假设我传递一个 char * 和长度，但C＃看到作为字节* m假设是一些C ++ / CLI魔术）。

我也试过通过 array< Byte ^> ^ 但是没有太多的幸运翻译 char * 从C ++ lib的其余部分到 byte 数组... 。

解决方案

我拍了一下，想出了这个。没有什么疯狂，只是分配管理数组，复制数据并返回。

头：

  #pragma once 
 using namespace System; 
 using namespace System :: Runtime :: InteropServices; 
命名空间CLRLib 
 {
 public ref class TwiddlerFunctions 
 {
 public：
 static array< Byte> ^ GetArray（）; 
}; 
} 
  

实施：

  #includeCLRLib.h
 array< Byte> ^ CLRLib :: TwiddlerFunctions :: GetArray（）
 {
 unsigned char data [] = {1，2，34，5}; 
 //将非托管数组转换为托管数组
 array< Byte> ^ arr = gcnew array< Byte>（sizeof data）; 
 Marshal :: Copy（（IntPtr）data，arr，0，arr-> Length）; 
 return arr; 
} 
  

C＃side：

b
$ b

  using System; 
使用CLRLib; 
 class Program 
 {
 static void Main（string [] args）
 {
 byte [] arr = TwiddlerFunctions.GetArray 
 Console.WriteLine（String.Join（，arr））; / / pre> 
I'm primarily a C# dev (not much C++ since college), but working on integrating a large collection of existing C++ code into an application. I have a C++/CLI assembly that is buffering the two worlds and have communication from C# through to C++ working fine. The question I have, is that the C++ class has a method call that generates a binary blob (think array of bytes in C# world) that I need to get in C# and process (pass around like a solid bag). 

What I'm looking for is advice on how to handle the buffer/wrapper method (C++/CLI) between the two worlds. I assumed that I'd pass a char* and length, but C# sees that as a byte* (I'm assuming that is some C++/CLI "magic"). 

I also tried passing array<Byte ^>^ but that haven't had much luck translating the char* from the rest of the C++ lib to the byte array... and what I have doesn't smell right.
解决方案
I took a shot at it and came up with this.  Nothing crazy, just allocate the managed array, copy the data and return it.

header:
#pragma once
using namespace System;
using namespace System::Runtime::InteropServices;
namespace CLRLib
{
    public ref class TwiddlerFunctions
    {
    public:
        static array< Byte >^ GetArray();
    };
}
implementation:
#include "CLRLib.h"
array< Byte >^ CLRLib::TwiddlerFunctions::GetArray()
{
    unsigned char data[] = { 1, 2, 34, 5 };
    // convert the unmanaged array to a managed array
    array< Byte >^ arr = gcnew array< Byte >(sizeof data);
    Marshal::Copy((IntPtr)data, arr, 0, arr->Length);
    return arr;
}
C# side:
using System;
using CLRLib;
class Program
{
    static void Main(string[] args)
    {
        byte[] arr = TwiddlerFunctions.GetArray();
        Console.WriteLine(String.Join(" ", arr)); // 1 2 34 5
    }
}


                        
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