C# 激发Marshal.PtrToStructure时AccessViolationException异常

我正在尝试使用VS2012 C#env中的本机dll。 我有一个奇怪的场景： 案例1：

使用以下Pinvoke包装：

        [DllImport("dcc.dll",CharSet=CharSet.Ansi, CallingConvention = CallingConvention.Cdecl)]
    public static extern UInt32 dcUeGetMacStats(thpHandle_t handle, /* MacStatistics*/out IntPtr stats);

        [DllImport("dcc.dll",CharSet=CharSet.Ansi, CallingConvention = CallingConvention.Cdecl)]
    public static extern UInt32 dcUeGetNasInfo(thpHandle_t handle, /* NasInfo*/out IntPtr info);

这是一节课：

                [StructLayout(LayoutKind.Sequential)]
            public class MacStatistics {
        public u32 activeDemultFailNumber;
        public u32 activeDemultySuccessNumber;
        public u32 pdschTotalDataNumber;
        public u16 taTimerLength;
        public u32 activePdschCrcCorrectNumber;
        public u32 activePdschCrcErrorNumber;
        public u8 antennaPortNumber;
        public u32 dlSystemRbNumber;
        public u32 parseDci0SuccessNumber;
        public u32 pdschCrcCorrectNumber;
        public u32 pdschCrcErrorNumber;
        public u32 pdschDynamicNumber;
        public u32 pdschSemiStaticNumber;
        public u32 receiveDci0Number;
        public u32 sendPucchSuccessNumber;
        public u32 sendPuschSuccessNumber;
        public u32 ulSubCarrierRBNumber;
        public u32 ulSymbolNumber;
        public u32 ulSystemRbNumber;
    };

        [StructLayout(LayoutKind.Sequential)]
    public class NasInfo {
        public  EmmPlmnSelectMode plmnSelectMode;//enum
        public u32 pdnQty;
        public EpsPdnAddress pdnArray;
        public Bool_t emmRegistred;
        public Bool_t rrcConnected;
        public EpsIntegrityAlgorithm integrityAlgo;//enum
        public EpsCipheringAlgorithm cipheringAlgo;//enum
    };

    [StructLayout(LayoutKind.Sequential)]
public class EpsPdnAddress {
    sqnBool_t epsIpv4AddressPresent;
    u8 [] epsIpv4Address = new u8[4];
    sqnBool_t epsIpv6AddressPresent;
    u8 [] epsIpv6Address = new u8[8];

}

这个箱子很好用 案例2：

使用以下Pinvoke包装：

        [DllImport("dcc.dll",CharSet=CharSet.Ansi, CallingConvention = CallingConvention.Cdecl)]
    public static extern UInt32 dcUeGetMacStats(thpHandle_t handle, /* MacStatistics*/out IntPtr stats);

        [DllImport("dcc.dll",CharSet=CharSet.Ansi, CallingConvention = CallingConvention.Cdecl)]
    public static extern UInt32 dcUeGetNasInfo(thpHandle_t handle, /* NasInfo*/out IntPtr info);

这是一节课：

                [StructLayout(LayoutKind.Sequential)]
            public class MacStatistics {
        public u32 activeDemultFailNumber;
        public u32 activeDemultySuccessNumber;
        public u32 pdschTotalDataNumber;
        public u16 taTimerLength;
        public u32 activePdschCrcCorrectNumber;
        public u32 activePdschCrcErrorNumber;
        public u8 antennaPortNumber;
        public u32 dlSystemRbNumber;
        public u32 parseDci0SuccessNumber;
        public u32 pdschCrcCorrectNumber;
        public u32 pdschCrcErrorNumber;
        public u32 pdschDynamicNumber;
        public u32 pdschSemiStaticNumber;
        public u32 receiveDci0Number;
        public u32 sendPucchSuccessNumber;
        public u32 sendPuschSuccessNumber;
        public u32 ulSubCarrierRBNumber;
        public u32 ulSymbolNumber;
        public u32 ulSystemRbNumber;
    };

        [StructLayout(LayoutKind.Sequential)]
    public class NasInfo {
        public  EmmPlmnSelectMode plmnSelectMode;//enum
        public u32 pdnQty;
        public EpsPdnAddress pdnArray;
        public Bool_t emmRegistred;
        public Bool_t rrcConnected;
        public EpsIntegrityAlgorithm integrityAlgo;//enum
        public EpsCipheringAlgorithm cipheringAlgo;//enum
    };

    [StructLayout(LayoutKind.Sequential)]
public class EpsPdnAddress {
    sqnBool_t epsIpv4AddressPresent;
    u8 [] epsIpv4Address = new u8[4];
    sqnBool_t epsIpv6AddressPresent;
    u8 [] epsIpv6Address = new u8[8];

}

此案例在以下行中引发AccessViolationException：

NasInfo ueNasState = (NasInfo)Marshal.PtrToStructure(p_stats, typeof(NasInfo));

我真的很困惑，本机函数确实更改了ptr值，因此它似乎进行了分配，但编组失败

请帮忙 谢谢 莫斯

[更新已解决]

public class NasInfo {
    public  EmmPlmnSelectMode plmnSelectMode;//enum
    public u32 pdnQty;
    public EpsPdnAddress pdnArray;
    public Bool_t emmRegistred;
    public Bool_t rrcConnected;
    public EpsIntegrityAlgorithm integrityAlgo;//enum
    public EpsCipheringAlgorithm cipheringAlgo;//enum
};

改为

    public class NasInfo {
    public  EmmPlmnSelectMode plmnSelectMode;//enum
    public u32 pdnQty;
    public /*EpsPdnAddress*/ IntPtr pdnArray;
    public Bool_t emmRegistred;
    public Bool_t rrcConnected;
    public EpsIntegrityAlgorithm integrityAlgo;//enum
    public EpsCipheringAlgorithm cipheringAlgo;//enum
};

马歇尔效应

---

但是我已经丢失了类型安全，有没有办法包装IntPtr，并且仍然有一些关于原始结构/类的细节（在本例中是epspdnadress）

请检查本机和托管结构的大小是否匹配

请检查本机和托管结构的大小是否匹配

请检查本机和托管结构的大小是否匹配

请检查本机和托管结构的大小是否匹配

请检查本机和托管结构的大小托管结构是匹配的更新：我构建了一个c程序来检查原始结构的大小，实际上它们不匹配，问题是：public epspdnadirect pdnArray；请检查本机结构和托管结构的大小是否匹配更新：我构建了一个c程序来检查原始结构的大小，事实上它们不匹配，问题是：public epspdnadirect pdnArray；请检查本机结构和托管结构的大小是否匹配更新：我构建了一个c程序来检查原始结构的大小，事实上它们不匹配，问题是：public epspdnadirect pdnArray；请检查本机结构和托管结构的大小是否匹配更新：我构建了一个c程序来检查原始结构的大小，事实上它们不匹配，问题是：public epspdnadirect pdnArray；