C#:封送包含数组的结构 [英] C#: marshalling a struct that contains arrays

问题描述

我正在做一些C#互操作工作.我有以下结构:

I am doing some C# interop work. I have the following struct:

#pragma pack(push,1)
typedef struct
{
    unsigned __int64 Handle;
    LinkType_t Type;
    LinkState_t State;
    unsigned __int64 Settings;
    signed __int8 Name[MAX_LINK_NAME];
    unsigned __int8 DeviceInfo[MAX_LINK_DEVINFO];
    unsigned __int8 Reserved[40];
} LinkInfo_t;

这是我尝试将其转换为C#结构:

This is my attempt to convert it into a C# struct:

[StructLayout(LayoutKind.Sequential, Pack = 1)]
public struct LinkInfo_t
{
    [MarshalAs(UnmanagedType.U8)]
    public UInt64 Handle;
    MarshalAs(UnmanagedType.I4)]
    public LinkType_t Type;
    [MarshalAs(UnmanagedType.I4)]
    public LinkState_t State;
    [MarshalAs(UnmanagedType.U8)]
    public UInt64 Settings;
    [MarshalAs(UnmanagedType.LPStr, SizeConst = MAX_LINK_NAME)]
    public string Name;
    [MarshalAs(UnmanagedType.ByValArray, SizeConst = MAX_LINK_DEVINFO, ArraySubType = UnmanagedType.U1)]
    public byte[] DeviceInfo;
    [MarshalAs(UnmanagedType.ByValArray, SizeConst = 40, ArraySubType = UnmanagedType.U1)]
    public byte[] Reserved;
}

但是，每当我初始化该结构时，名称，设备信息和保留字段都将设置为null.我该如何解决?

However, whenever I initialize the struct the Name, DeviceInfo, and Reserved fields are all set to null. How do I fix this?

推荐答案

对于数组，请尝试使用fixed关键字:

For the arrays, try to use the fixed keyword:

public fixed byte DeviceInfo[MAX_LINK_DEVINFO];
public fixed byte Reserved[40];

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