C# - 如何在包含数组的结构中编组非托管结构

Question

我的任务是将 C# 程序连接到具有非托管代码的 .DLL。我在互联网上找不到任何东西来帮助我让它工作。我收到 PInvokeStackImbalance 异常。我曾尝试将 CallingConvention 更改为 .Winapi 但没有成功。我可能会完全错误地解决这个问题，因此感谢任何关于如何处理这个问题的指导！

这是我必须使用的非托管代码：

extern "C" __declspec(dllexport) int WINAPI GetAlarm (unsigned short hndl, ALARMALL *alarm);

typedef struct {
    ALARM alarm [ALMMAX];
} ALARMALL;
ALMMAX = 24

typedef struct {
    short eno;
    unsigned char sts;
    char msg[32];
} ZALARM;

这是我编写的托管 C# 端：

[DllImport("my.dll", EntryPoint = "GetAlarm", CallingConvention = CallingConvention.Cdecl)]
public static extern int GetAlarm(ushort hndl, ALARMALL alarm);

public struct ALARMALL 
{
    [MarshalAs(UnmanagedType.ByValArray, SizeConst = 24)]
    ZALARM alarm;
}

[StructLayout(LayoutKind.Sequential)]
public struct ZALARM
{
    [MarshalAs(UnmanagedType.I2)]
    public short eno;

    [MarshalAs(UnmanagedType.U1)]
    public byte sts;

    [MarshalAs(UnmanagedType.I1, SizeConst = 32)]
    public char msg;
}

Answer 1

终于让它正常工作了，所以我会 post 为任何可能觉得它有用的人提供帮助。

[DllImport("my.dll", EntryPoint = "GetAlarm")]
public static extern int GetAlarm(ushort hndl, ref ALARMALL alarm);

[StructLayout(LayoutKind.Sequential, CharSet = CharSet.Ansi)]
public struct ALARMALL
{
    [MarshalAs(UnmanagedType.ByValArray, SizeConst = 24)]
    public ZALARM[] alarm;
}

[StructLayout(LayoutKind.Sequential, CharSet = CharSet.Ansi)]
public struct ZALARM
{
    public short eno;

    public byte sts;

    [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 32)]
    public string msg;

C# - 如何在包含数组的结构中编组非托管结构

C# - How to marshal an unmanaged struct within a struct that contains arrays

c#

struct

unmanaged

dllimport

dllexport