将结构编组为非托管数组

发布于 2024-08-27 05:23:41 字数 477 浏览 3 评论 0原文

我有一个 C# 结构体来表示笛卡尔向量，如下所示：

public struct Vector  
{  
    private double x;  
    private double y;  
    private double z;  

    //Some properties/methods
}

现在我有一个非托管 C dll，需要使用 P/Invoke 进行调用。某些方法需要 double[3] 参数。

非托管 C 签名类似于

void Cross(double a[3], double b[3], double c[3]);

是否有任何方法可以设置 P/Invoke 签名，以便我可以传递 Vector 结构的实例并将它们透明地封送到非托管 double[3]？我还需要双向封送，因为非托管函数需要将输出写入参数数组，所以我想我需要封送为 LpArray。

原文

I have a C# struct to represent a cartesian vector, something like this:

public struct Vector  
{  
    private double x;  
    private double y;  
    private double z;  

    //Some properties/methods
}

Now I have an unmanaged C dll that I need to call with P/Invoke. Some methods expect a double[3] parameter.

The unmanaged C signature is something like

void Cross(double a[3], double b[3], double c[3]);

Is there any way to set up a P/Invoke signature so I can pass instances of my Vector struct and marshal them transparently to unmanaged double[3]? I would also need bidirectional marshaling as the unmanaged function needs to write the output to the argument array, so I guess I would need to marshal as LpArray.

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べ映画 2024-09-03 05:23:41

您可以在 P/Invoke 声明中撒谎，成员将在所有当前 CPU 架构上正确对齐，以便在非托管代码中作为数组读取：

[DllImport("blah.dll")]
private static extern void Cross(ref Vector a, ref Vector b, ref Vector c);

You can lie in your P/Invoke declaration, the members will align properly on all current CPU architectures to be readable as an array in unmanaged code:

[DllImport("blah.dll")]
private static extern void Cross(ref Vector a, ref Vector b, ref Vector c);

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顾冷 2024-09-03 05:23:41

我手边没有编译器，但我想知道您是否可以使用类似的东西

[MarshalAs(...)]
[StructLayout(LayoutKind::Sequential, Pack=1)]
public struct Vector  
{  
    private double x;  
    private double y;  
    private double z;  

    //Some properties/methods
}

参见此处和此处和此处

I don't have my compilers to hand, but I wonder if you can use something like

[MarshalAs(...)]
[StructLayout(LayoutKind::Sequential, Pack=1)]
public struct Vector  
{  
    private double x;  
    private double y;  
    private double z;  

    //Some properties/methods
}

See here and here and here

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