在C和C#之间交换结构(涉及到其他结构的指针) [英] Exchange structures (envolving pointers to other structures) between C and C#

问题描述

我想使用PInvoke将以下内容带给托管方:

I want to use PInvoke to bring to managed side something this:

(C代码)

typedef struct {
//一些字段...
} 一种;

typedef struct{
//some fields...
} A;

类型struct {
A * a;
} B;

type struct{
A* a;
} B;

int getB(B * destination){//目标将是C#的输出参数.
//将B放入目的地"
返回0;
}

int getB(B* destination){ //destionation will be an output parameter to C#
//puts an B in 'destination'
return 0;
}

现在，我需要一种方法来告诉托管方如何将B从C编组为C#结构或类.我尝试了很多事情，例如IntPtr字段，MarchalAs属性，但没有成功.我不会在这里公开我试图保持问题简单的代码.但是，只要有较长的答案，我就可以做到.

Now, I need a way to tell managed side how to marshalling B from C to C# structure or class. I've tryed many things such as IntPtr fields, MarchalAs atributes, but with no success. I will not expose here the code that I've tryed to keep the question simple. However i could do it as long answers arrive.

推荐答案

您可以使用元帅类来做到这一点.

You can do that using the Marshal class.

// Define a C# struct to match the unmanaged one
struct B
{
    IntPtr a;
}

[DllImport("dllName")]
extern int getB(IntPtr destination);

B GetB()
{
    IntPtr ptrToB = IntPtr.Zero;
    getB(ptrToB);
    return (B)Marshal.PtrToStructure(ptrToB, typeof(B));
}

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