C#-如何在包含数组的结构中封送非托管结构

我的任务是用非托管代码将C#程序连接到.DLL。我在互联网上找不到任何东西来帮助我实现这一目标。我收到一个Pinvokestack异常。我尝试将呼叫约定更改为.Winapi，但运气不佳。我可能是完全错误的，所以任何关于如何处理这一问题的指导都是值得赞赏的

以下是我必须处理的非托管代码：

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;

下面是我写的托管C#side：

[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;
}

---

终于让它正常工作了，所以我将为任何可能发现它有用的人发帖

[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;

---

这不是cdecl。你为什么要那样做？WINAPI扩展到stdcall。函数接受指向struct的指针。你按价值传递它。根据语义，通过ref或out传递它。你也不会很幸运地从味精中读到任何东西。