如何将 C# 结构体转换为 C 结构体？

发布于 2025-01-06 13:08:08 字数 501 浏览 4 评论 0原文

[StructLayout(LayoutKind.Sequential, Size = 280), Serializable]
public struct AESContext
{
    /// int nr; 
    [MarshalAsAttribute(UnmanagedType.I4, SizeConst = 4)]
    public int nr;

    /// unsigned long *rk;
    [MarshalAsAttribute(UnmanagedType.U4, SizeConst = 4)]
    public uint rk;

    // unsigned long buf[68];
    [MarshalAsAttribute(UnmanagedType.ByValArray, SizeConst = 68)]
    public uint[] buf;
}

这是我迄今为止拥有的 C# 结构。每个字段上方的注释都是用 C 语言键入的。如果有人可以验证，我会很高兴。

原文

[StructLayout(LayoutKind.Sequential, Size = 280), Serializable]
public struct AESContext
{
    /// int nr; 
    [MarshalAsAttribute(UnmanagedType.I4, SizeConst = 4)]
    public int nr;

    /// unsigned long *rk;
    [MarshalAsAttribute(UnmanagedType.U4, SizeConst = 4)]
    public uint rk;

    // unsigned long buf[68];
    [MarshalAsAttribute(UnmanagedType.ByValArray, SizeConst = 68)]
    public uint[] buf;
}

This is C# struct I have so far. Comment above each field is type in C.
I would love if someone could verify.

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喜爱皱眉﹌ 2025-01-13 13:08:08

听起来您正在尝试获取成员内容中定义的 C 结构的 C# 结构。如果是这样，那么我相信您需要进行以下

[StructLayout(LayoutKind.Sequential), Serializable]
public struct AESContext
{
    /// int nr; 
    public int nr;

    /// unsigned long *rk;
    public UIntPtr rk;

    // unsigned long buf[68];
    [MarshalAsAttribute(UnmanagedType.ByValArray, SizeConst = 68)]
    public uint[] buf;
}

基本更改

不要在 StructLayout 中指定 SizeConst 除非您尝试创建一个大小不同（通常）大于它的结构内容。这样做并不常见。
原始类型通常不需要 MarshalAs
使用 IntPtr 或 UIntPtr 来 PInvoke 指针类型。它们的大小在 32 和 64 位平台之间有适当的变化

It sounds like you're trying to get the C# struct for the C struct defined in the member contents. If so then I believe you want the following

[StructLayout(LayoutKind.Sequential), Serializable]
public struct AESContext
{
    /// int nr; 
    public int nr;

    /// unsigned long *rk;
    public UIntPtr rk;

    // unsigned long buf[68];
    [MarshalAsAttribute(UnmanagedType.ByValArray, SizeConst = 68)]
    public uint[] buf;
}

Basic changes

Don't specify SizeConst in StructLayout unless you are trying to create a struct whose size is different (typically) bigger than it's contents. It's not very common to do this
MarshalAs isn't usually needed for primitive types
Use IntPtr or UIntPtr to PInvoke pointer types. They vary properly in size between 32 and 64 bit platforms

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