C# 调用C++dll的参数为数据结构指针的指针

2016-12-05 02:43:16 274 阅读 AI 写同款 · GEO 优化AI 选题数据监测一键分发 ›

C#调用C++的dll方法 C#调用C++的dll总归可以有两种方法： 1、非托管C++创建的dll库，需要用静态方法调用； 2、直接使用CLR，生成托管C++dll库。阅读详情

C++的dll

HRESULT extern WINAPI WFSGetInfo ( HSERVICE hService, DWORD dwCategory, LPVOID lpQueryDetails, DWORD dwTimeOut, LPWFSRESULT * lppResult);

结构体

typedef struct _wfs_result

	{

		REQUESTID RequestID;

		HSERVICE hService;

		SYSTEMTIME tsTimestamp;

		HRESULT hResult;

		union {

			DWORD dwCommandCode;

			DWORD dwEventID;

		} u;

		LPVOID lpBuffer;

	} WFSRESULT, * LPWFSRESULT;

typedef struct _wfs_idc_status

{

WORD	fwDevice;

WORD	fwMedia;

WORD	fwRetainBin; 

WORD	fwSecurity; 

USHORT usCards;

WORD	fwChipPower; 

LPSTR	lpszExtra;

} WFSIDCSTATUS, *LPWFSIDCSTATUS;

c#的定义

      [StructLayout(LayoutKind.Sequential, CharSet = CharSet.Ansi)]

      public struct WFSRESULT1

        {

            public UInt32 RequestID;

            public ushort hService;

            public _SYSTEMTIME tsTimestamp;//对应下面的 _SYSTEMTIME

            public int hResult;

            public AnonymousStruct U;//对应下面的 AnonymousStruct 结构

            public IntPtr lpBuffer;//返回的指针，指向_wfs_idc_status 这个结构

        }

        [StructLayout(LayoutKind.Sequential, CharSet = CharSet.Ansi)]

        public struct LPStruct

        {

            public IntPtr ptrWFSRESULT;//返回的指针，指向WFSRESULT1 这个结构

        }

      [StructLayout(LayoutKind.Sequential, CharSet = CharSet.Ansi)]

        public struct _wfs_idc_status

        {

            public UInt16 fwDevice;

            public UInt16 fwMedia;

            public UInt16 fwRetainBin;

            public UInt16 fwSecurity;

            public ushort usCards;

            public UInt16 fwChipPower;

            [MarshalAsAttribute(UnmanagedType.ByValTStr, SizeConst = 999)]

            public string lpszExtra;

        }

        [StructLayout(LayoutKind.Sequential, CharSet = CharSet.Ansi)]

        public struct _SYSTEMTIME

        {

            public UInt16 wYear;

            public UInt16 wMonth;

            public UInt16 wDayOfWeek;

            public UInt16 wDay;

            public UInt16 wHour;

            public UInt16 wMinute;

            public UInt16 wSecond;

            public UInt16 wMilliseconds;

        }

        [DllImport("msxfs.dll", CharSet = CharSet.Ansi)]

        public static extern int WFSGetInfo(int iService, int iCategory, string sQueryDetail, int iTimeOut, ref IntPtr ptr);

C#执行

            LPStruct lpStruct = new LPStruct();

            IntPtr ptr = Marshal.AllocHGlobal(Marshal.SizeOf(lpStruct));

            Marshal.StructureToPtr(lpStruct, ptr, false);

            int iRet = WFSGetInfo(m_service, WFS_INF_IDC_STATUS, null, 2000, ref ptr);

            lpStruct = (LPStruct)Marshal.PtrToStructure(ptr, typeof(LPStruct));

            WFSRESULT1 wfsR1;

            wfsR1 = (WFSRESULT1)Marshal.PtrToStructure(lpStruct.ptrWFSRESULT, typeof(WFSRESULT1));//运行会在Application.Run()里面报错"未处理AccessViolationException。尝试读取或写入受保护的内存。这通常指示其他内存已损坏。"

            _wfs_idc_status stat1 = (_wfs_idc_status)Marshal.PtrToStructure(wfsR1.lpBuffer, typeof(_wfs_idc_status));

请求各位高手指教，是我定义和操作结构体错误导致的吗？

...全文

C#项目中调用C++生成的Dll 入门教程如何在C#中调用C++生成的DLL文件阅读详情

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切换为时间正序

EasonLouis 2016-12-05

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弄好了一半，我上面用LPSTRUCT结构体里的IntPtr ptrWFSRESULT返回的指针，指向WFSRESULT1 这个结构是错的，直接使用WFSRESULT1 结构体就行。修改如下

            WFSRESULT1 wfsR1 = new WFSRESULT1();
            IntPtr ptr = IntPtr.Zero;
            int iRet = WFSGetInfo(m_service, WFS_INF_IDC_STATUS, null, 2000, ref ptr);
            wfsR1 = (WFSRESULT1)Marshal.PtrToStructure(ptr, typeof(WFSRESULT1));

但是之后

             _wfs_idc_status stat1 = new _wfs_idc_status();
            stat1 = (_wfs_idc_status)Marshal.PtrToStructure(wfsR1.lpBuffer, typeof(_wfs_idc_status));

第二行报错"引发类型为“System.ExecutionEngineException”的异常。"。

EnForGrass 2016-12-05

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REQUESTID RequestID; HSERVICE hService这两个真不知道是什么类型的，你自己搞定吧


public struct SYSTEMTIME {
    
    /// WORD->unsigned short
    public ushort wYear;
    
    /// WORD->unsigned short
    public ushort wMonth;
    
    /// WORD->unsigned short
    public ushort wDayOfWeek;
    
    /// WORD->unsigned short
    public ushort wDay;
    
    /// WORD->unsigned short
    public ushort wHour;
    
    /// WORD->unsigned short
    public ushort wMinute;
    
    /// WORD->unsigned short
    public ushort wSecond;
    
    /// WORD->unsigned short
    public ushort wMilliseconds;
}
public struct WFSRESULT {
    
    /// short
    public short RequestID;//假如为short
    
    /// short
    public short hService;////假如为short
    
    /// SYSTEMTIME->_SYSTEMTIME
    public SYSTEMTIME tsTimestamp;
    
    /// HRESULT->LONG->int
    public int hResult;

    public System.IntPtr lpBuffer;
}


public struct WFSIDCSTATUS {
    
    /// WORD->unsigned short
    public ushort fwDevice;
    
    /// WORD->unsigned short
    public ushort fwMedia;
    
    /// WORD->unsigned short
    public ushort fwRetainBin;
    
    /// WORD->unsigned short
    public ushort fwSecurity;
    
    /// USHORT->unsigned short
    public ushort usCards;
    
    /// WORD->unsigned short
    public ushort fwChipPower;
    
    /// LPSTR->CHAR*
    [System.Runtime.InteropServices.MarshalAsAttribute(System.Runtime.InteropServices.UnmanagedType.LPStr)]
    public string lpszExtra;
}


    [System.Runtime.InteropServices.DllImportAttribute("XXX.dll", EntryPoint="WFSGetInfo")]
public static extern  int WFSGetInfo(short hService, uint dwCategory, System.IntPtr lpQueryDetails, uint dwTimeOut, ref System.IntPtr lppResult) ;

EnForGrass 2016-12-05

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搞不清楚REQUESTID RequestID; HSERVICE hService; SYSTEMTIME tsTimestamp;这几个是什么

C# 调用C++dll的参数为数据结构指针的指针

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