马歇尔结构数组 [英] Marshall array of structures

问题描述

我花了很多时间寻找解决方案，但仍然找不到答案.

I've spent a lot of time to look for the solution but still don't find it out.

我有2个课程:

[StructLayout(LayoutKind.Sequential)]
public class Result
{
    public int Number;
    [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 4)]
    public string Name;
    public int Size;
}

[StructLayout(LayoutKind.Sequential)]
public class CoverObject
{
    public int NumOfResults;
    [MarshalAs(UnmanagedType.ByValArray, ArraySubType = UnmanagedType.Struct, SizeConst = 4)]
    public Result[] Results;
}

我期望命令 Marshal.SizeOf(typeof(CoverObject))将返回52，但不会返回20，因此，我以后使用的所有marshall和unmarshall均无法正常工作.

My expectation that the command Marshal.SizeOf(typeof(CoverObject)) will return 52, but not, it's just 20. Thus, all of marshall and unmarshall that I use later are not working.

似乎只计算Result类中的第一个成员(数字).我做错了什么吗?

Seeming it only counts the first member (Number) in Result class. Did I do anything wrong?

推荐答案

将类更改为结构

[StructLayout(LayoutKind.Sequential)]
public struct Result
{
    public int Number;
    [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 4)]
    public string Name;
    public int Size;
}

[StructLayout(LayoutKind.Sequential)]
public struct CoverObject
{
    public int NumOfResults;
    [MarshalAs(UnmanagedType.ByValArray, ArraySubType = UnmanagedType.Struct, SizeConst = 4)]
    public Result[] Results;
}

其他地方:

Marshal.SizeOf(typeof(CoverObject)) // it will return 52

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