Question

我试图将一个函数从C＃调用一个用Borland C ++编写的.DLL，其签名是：

extern "C" __declspec(dllexport) ls50errortype __stdcall Ls50P2Open(ls50p2apiconfiginfostruct &configinfo);

C＃中的相应调用：

[DllImport("C:\\Lumistar\\LDPS_8x\\Ls50P2_Dll.dll", EntryPoint = "Ls50P2Open", CallingConvention = System.Runtime.InteropServices.CallingConvention.StdCall, CharSet = CharSet.Ansi, SetLastError = true)]
public static extern void Ls50P2Open(ref ls50p2apiconfiginfostruct configinfo);

感兴趣的结构（ls50p2apiconfiginfostruct）由嵌套结构和枚举组成（从C ++标题中复制）：

typedef enum
{
    MFMODEL_LS50P1,
    MFMODEL_4422PCI,
    MFMODEL_LS50P2,
    MFMODEL_LS70P2,
    MFMODEL_LS5070,
    MFMODEL_LAST
}ecardmodel;    

typedef enum
{
    CHANNELDEVICE_NONE,
    CHANNELDEVICE_50,
    CHANNELDEVICE_70,
    CHANNELDEVICE_LAST
}ls50p2channeldevicetype;

typedef enum
{
    LS50V2DCARD_NONE, 
    LS50V2DCARD_40V1_10,
    LS50V2DCARD_40V1_20,
    LS50V2DCARD_40V2_10,
    LS50V2DCARD_40V2_20,
    LS50V2DCARD_38,
    LS50V2DCARD_LAST
}ls50p2daughtercardtype;


typedef struct
{
    bool HasDaughterCard;
    ls50p2daughtercardtype DCardType;
    bool SpecialStatusCapable;

    int MaxBitsyncInputs;
    bool HasBitsyncConfidenceLevel;

    bool HasBitsync2ndCh;
    bool SpecialStatusCapable2ndCh;
    bool HasBitsyncConfidenceLevel2ndCh;

    ls50p2daughtercardtype DCardType2ndCh;
    int MaxBitsyncInputs2ndCh;
}ls50p2daughtercardinfostruct;

typedef struct
{
    ecardmodel DeviceModel;
    ls50p2channeldevicetype ChannelDataTypeAry[2];
    ls50p2daughtercardinfostruct DaughterCardInfo;

    bool HasExtendedBertPatterns;

    int FirmwareVersionAry[2];
    int NumPremodFiltersAry[2];
    double Ls50SimPreModFilterKhzAry[2][LS50V2_MAX50SIMPREMODFILTERS];
    double Ls50SimMinFmDeviationKhzAry[2];
    double Ls50SimMaxFmDeviationKhzAry[2];
}ls50p2cardconfigstruct;

typedef struct
{
    unsigned char *DataBuf;
    HANDLE hNewDataRdy;
    DWORD MaxBufLength;
    DWORD CurrentBufLength;
    int NumHeaderBytes;
}ls50p2carddatastruct;

typedef struct
{
    ls50p2cardconfigstruct CardConfigInfo[MAXMFCARDS];
    int Ls50P2CardCount;
    ls50p2carddatastruct DataInfo[MAXMFCARDS][2];
}ls50p2apiconfiginfostruct;

这是C＃中相应的结构：

    public enum ecardmodel
    {
        MFMODEL_LS50P1,
        MFMODEL_4422PCI,
        MFMODEL_LS50P2,
        MFMODEL_LS70P2,
        MFMODEL_LS5070,
        MFMODEL_LAST
    }

    public enum ls50p2channeldevicetype
    {
        CHANNELDEVICE_NONE,
        CHANNELDEVICE_50,
        CHANNELDEVICE_70,
        CHANNELDEVICE_LAST
    };

    public enum ls50p2daughtercardtype
    {
        LS50V2DCARD_NONE,
        LS50V2DCARD_40V1_10,
        LS50V2DCARD_40V1_20,
        LS50V2DCARD_40V2_10,
        LS50V2DCARD_40V2_20,
        LS50V2DCARD_38,
        LS50V2DCARD_LAST
    }

    [StructLayout(LayoutKind.Sequential)]
    public struct ls50p2daughtercardinfostruct
    {
        public bool HasDaughterCard;
        public ls50p2daughtercardtype DCardType;
        public bool SpecialStatusCapable;

        public int MaxBitsyncInputs;
        public bool HasBitsyncConfidenceLevel;

        public bool HasBitsync2ndCh;
        public bool SpecialStatusCapable2ndCh;
        public bool HasBitsyncConfidenceLevel2ndCh;

        public ls50p2daughtercardtype DCardType2ndCh;
        public int MaxBitsyncInputs2ndCh;
    }

    [StructLayout(LayoutKind.Sequential)]
    public struct ls50p2cardconfigstruct
    {
        public ecardmodel DeviceModel;
        public ls50p2daughtercardtype[] ChannelDataTypeAry;
        public ls50p2daughtercardinfostruct DaughterCardInfo;

        public bool HasExtendedBertPatterns;

        public int[] FirmwareVersionAry;
        public int[] NumPremodFiltersAry;
        public double[] Ls50SimPreModFilterKhzAry;
        public double[] Ls50SimMinFmDeviationKhzAry;
        public double[] Ls50SimMaxFmDeviationKhzAry;
    }

    [StructLayout(LayoutKind.Sequential)]
    public struct ls50p2carddatastruct
    {
        public StringBuilder DataBuf;
        public IntPtr hNewDataRdy;
        public uint MaxBufLength;
        public uint CurrentBufLength;
        public int NumHeaderBytes;
    }

    [StructLayout(LayoutKind.Sequential)]
    public struct ls50p2apiconfiginfostruct
    {
        public ls50p2cardconfigstruct[] CardConfigInfo;
        public int Ls50P2CardCount;
        public ls50p2carddatastruct[,] DataInfo;
    }

以下是我用来调用函数的C＃代码：

    ls50p2apiconfiginfostruct lscfg = new ls50p2apiconfiginfostruct();

    lscfg.CardConfigInfo = new ls50p2cardconfigstruct[8];
    for (int i = 0; i < 8; i++)
    {
        lscfg.CardConfigInfo[i].ChannelDataTypeAry = new ls50p2daughtercardtype[2];
    }

    lscfg.DataInfo = new ls50p2carddatastruct[8, 2];

    Ls50P2Open(ref lscfg);

我尝试在C＃中创建这个结构但是我没有取得多大成功（枚举，2D数组，固定大小的缓冲区的问题）。在C＃中创建此结构的正确方法是什么？这需要在不安全的环境中完成吗？

现在由于某种原因，我在运行代码时遇到以下错误：

An unhandled exception of type 'System.Runtime.InteropServices.COMException' occurred in Library.dll

Additional information: Old format or invalid type library. (Exception from HRESULT: 0x80028019 (TYPE_E_UNSUPFORMAT))

Answer 1

您的C＃结构是什么样的。您使用的是StructLayoutAttribute吗？ http://msdn.microsoft.com/en-us/library/system.runtime.interopservices.structlayoutattribute.aspx

您可以将它与顺序选项一起使用，这样您就必须使用正确顺序的字段填充c＃结构。

Answer 2

我相信这里的阵列问题或多或少得到了回答; Improper marshaling: C# array to a C++ unmanaged array

接受的答案显示了如何安全地封送动态分配的数组。

至于枚举，它们不应该造成任何问题，有一个干净的1：1映射。事实上，我会按照这篇msdn帖子的描述去做; http://blogs.msdn.com/b/abhinaba/archive/2007/08/27/sharing-enums-across-c-and-c.aspx

您可以简单地在.cs文件中定义所有枚举，然后将其包含在两个项目中，一切都会正常工作。

编组从C＃到C ++ DLL的嵌套结构

2 个答案: