包装器DOTNET到本机编写的C ++ CLI BestWay传递strutures？ [英] Wrapper for DOTNET to native written in C++ CLI BestWay to pass strutures?

问题描述

然而，我正在写一个包装器在C + + CLI为我们的应用程序给一些新的部分（用C＃编写）保存和容易访问旧的本地库。因此，我需要通过一些结构从c＃到c ++。这些结构在C ++ Cli（dotnet）和C ++中定义。

Yet I am writting a wrapper in C++ CLI for our application to give some new parts (written in C#) save and easy access to old native libraries. Therefore I need to pass some structures from c# to c++. These structures are defined in C++ Cli (dotnet) and also in C++.

示例：

\\C+++
typedef struct
{                                                           
INFO16   jahr   ;
INFO8    monat  ;
INFO8    tag    ;
INFO8    stunde ;
INFO8    minute ;
}
SDATUM;

\\c++ cli
[StructLayout(LayoutKind::Explicit)]
public value struct SDATUM
{
public:
  [FieldOffset(0)]
  UInt16 jahr;
  [FieldOffset(2)]
  Byte monat;
  [FieldOffset(3)]
  Byte tag;
  [FieldOffset(4)]
  Byte stunde;
  [FieldOffset(5)]
  Byte minute;
};

现在我在C ++ cli中提供一些函数，接受这种类型的dotnet类型为SDATUM值，通过引用（sdatum％）和指针sdatum *，就像有相应的本机函数。我需要转换/转换这些结构？

Now I provide some functions in C++ cli which accept this type as dotnet type SDATUM in form of pass by value,by reference (sdatum%) and pointer sdatum* like there corresponding native functions. What do I need to convert/cast these struct?

推荐答案

我发现另一个解决方案是非常容易，简短，复制数据。
你可以这样调用想要C SDATUM的本地函数：

I found another solution which is very easy, short and does not need copying data. You could call native functions which want a C SDATUM in this way:

//signature
void someFunction(SDATUM datum);

void someFunctionWrapper(SDATUM datum){
pin_ptr<SDATUM>  datum_pin=&datum;


//::SDATUM refers to the C-Type
someFunction(*(::SDATUM*)datum_pin);
}

我测试了它，因为两个SDATUM结构都有相同的位结构。因为我只调用
短的本地函数，我认为碎片没有问题。

I tested it and it works because both SDATUM Structs have the same bit structure. Because I only call short native functions I think fragmentation is no problem.

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