如何在 C# 中定义 TBBUTTON 结构? [英] How do I define the TBBUTTON struct in C#?

问题描述

大家好，

TBBUTTON 结构体在 MSDN 上定义如下:

The TBBUTTON struct is defined on MSDN as follows:

typedef struct {
  int       iBitmap;
  int       idCommand;
  BYTE      fsState;
  BYTE      fsStyle;
#ifdef _WIN64
  BYTE      bReserved[6];
#else 
#if defined(_WIN32)
  BYTE      bReserved[2];
#endif 
#endif 
  DWORD_PTR dwData;
  INT_PTR   iString;
} TBBUTTON, *PTBBUTTON, *LPTBBUTTON;

我需要使用这个结构在 C# 中做一些互操作.我如何复制这个怪物，以便在为 AnyCPU 编译时正确定义它?谷歌显然充满了危险的错误信息！

I need to do some interop in C# using this struct. How do I replicate this monster so that it's defined correctly when compiled for AnyCPU? Google is apparently full of dangerous misinformation!

推荐答案

啊，我知道必须有办法.这是:

Ahah, I knew there had to be a way. And here it is:

[StructLayout(LayoutKind.Sequential)]
public struct TBBUTTON {
    public int iBitmap;
    public int idCommand;
    [StructLayout(LayoutKind.Explicit)]
    private struct TBBUTTON_U {
        [FieldOffset(0)] public byte fsState;
        [FieldOffset(1)] public byte fsStyle;
        [FieldOffset(0)] private IntPtr bReserved;
    }
    private TBBUTTON_U union;
    public byte fsState { get { return union.fsState; } set { union.fsState = value; } }
    public byte fsStyle { get { return union.fsStyle; } set { union.fsStyle = value; } }
    public UIntPtr dwData;
    public IntPtr iString;
}

Marshal.SizeOf 在 x64 进程上返回 32，在 x86 进程上返回 20，当我将它传递给 SendMessage 时，一切都会结束.我知道你可以做到，C#！

Marshal.SizeOf returns 32 on x64 processes and 20 on x86 processes, and everything ends up where it should when I pass this to SendMessage. I knew you could do it, C#!

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