我如何使用dllimport的结构与在C＃中的参数？ [英] How do I use DLLImport with structs as parameters in C#?

问题描述

我可以找到使用的DllImport从C＃传递整数来回调用C ++代码的所有的例子。我可以得到这些例子的工作就好了。我需要调用的方法有两个结构作为它的进口参数，我不完全清楚，我怎样才能使这项工作。

下面是我得到了什么工作有：

我自己的C ++代码，这样我就可以做任何更改/添加到它，我需要

一个第三方应用程序将在启动时加载我的DLL，预计该DLLEXPORT被定义一定的方式，所以我不能真正改变方法签名多数民众赞成获取导出。

在C＃应用程序我建设将被用来作为一个包装，所以我可以集成这个C ++一块到我们的一些其他应用程序，它们都用C＃编写的。

我需要调用C ++方法签名看起来像这样

  DLLEXPORT INT计算（常量MathInputStuctType *输入， 
 MathOutputStructType *输出，无效** formulaStorage）
  

和MathInputStructType被定义为以下

  typedef结构MathInputStuctTypeS {
 INT _setData; 
双_data [（INT）字段大小] 
 INT _setTdData; 
} MathInputStuctType; 
  

解决方案

MSDN主题的Passing 有一个很好的介绍，传递结构非托管代码结构。您也想看看封送处理数据与平台调用和的Marshaling类型的数组的。

All the examples I can find using DLLImport to call C++ code from C# passes ints back and forth. I can get those examples working just fine. The method I need call takes two structs as its import parameters, and I'm not exactly clear how I can make this work.

Here's what I've got to work with:

I own the C++ code, so I can make any changes/additions to it that I need to.

A third party application is going to load my DLL on startup and expects the DLLExport to be defined a certain way, so i can't really change the method signature thats getting exported.

The C# app I'm building is going to be used as a wrapper so i can integrate this C++ piece into some of our other applications, which are all written in C#.

The C++ method signature I need to call looks like this

DllExport int Calculate (const MathInputStuctType *input, 
    MathOutputStructType *output, void **formulaStorage)

And MathInputStructType is defined as the following

typedef struct MathInputStuctTypeS {
    int				_setData;
    double				_data[(int) FieldSize];
    int				_setTdData;
} MathInputStuctType;

解决方案

The MSDN topic Passing Structures has a good introduction to passing structures to unmanaged code. You'll also want to look at Marshaling Data with Platform Invoke, and Marshaling Arrays of Types.

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