求助——C#调用C dll结构体的函数指针怎么写？

一绵牛 2015-12-01 09:43:29

如题新手求帮助
c

typedef struct tagRVD

  {

    void (*control_cmd) (int sn, unsigned char* data, int length);

    void (*bin_msg) (unsigned char* data, int length);

    void (*async_callback) (int sn, int result);

  } RVD_t;



  RVD_Export int init_rvd (RVD_t* rvd,int id);

  RVD_Export void close_rvd (RVD_t* rvd);

  RVD_Export int req_cmd (int sn,const char* json);

  RVD_Export int _cmd (int sn,const char* json);

在C#中调用怎么写啊

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一绵牛 2015-12-01

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引用 3 楼 caojinrong 的回复:

        public delegate void ControlCmd(int sn, byte data, int length);
        public delegate void BinMsg(StringBuilder data, int length);
        public delegate void AsyncCallback(int sn, int result);

        public struct RVD_t
        {
            private IntPtr control_cmd;
            private IntPtr bin_msg;
            private IntPtr async_callback;

            public ControlCmd ControlCmd { get { return Marshal.GetDelegateForFunctionPointer(control_cmd, typeof(ControlCmd)) as ControlCmd; } }
            public BinMsg BinMsg { get { return Marshal.GetDelegateForFunctionPointer(bin_msg, typeof(BinMsg)) as BinMsg; } }
            public AsyncCallback AsyncCallback { get { return Marshal.GetDelegateForFunctionPointer(async_callback, typeof(AsyncCallback)) as AsyncCallback; } }
        }

        [DllImport("<dllname>.dll")]
        private static extern int init_rvd(ref RVD_t rvd, int id);
        [DllImport("<dllname>.dll")]
        private static extern void close_rvd(ref RVD_t rvd);
        [DllImport("<dllname>.dll")]
        private static extern int req_cmd(int sn, string json);
        [DllImport("<dllname>.dll")]
        private static extern int _cmd(int sn, string json);

受教了，谢谢

一绵牛 2015-12-01

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引用 4 楼 u012948520 的回复:

函数指针对应委托，委托加上特性 [UnmanagedFunctionPointer(CallingConvention.StdCall)] 一般指针对应IntPtr 方法加上特性[DllImport("XXXX.dll", CallingConvention = CallingConvention.Cdecl)] 结构体视要求加上特性[StructLayout(LayoutKind.Sequential)]

谢谢，这是远程协管，是个代理，c# 没研究那么深...

白衣如花 2015-12-01

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函数指针对应委托，委托加上特性 [UnmanagedFunctionPointer(CallingConvention.StdCall)] 一般指针对应IntPtr 方法加上特性[DllImport("XXXX.dll", CallingConvention = CallingConvention.Cdecl)] 结构体视要求加上特性[StructLayout(LayoutKind.Sequential)]

caojinrong 2015-12-01

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        public delegate void ControlCmd(int sn, byte data, int length);
        public delegate void BinMsg(StringBuilder data, int length);
        public delegate void AsyncCallback(int sn, int result);

        public struct RVD_t
        {
            private IntPtr control_cmd;
            private IntPtr bin_msg;
            private IntPtr async_callback;

            public ControlCmd ControlCmd { get { return Marshal.GetDelegateForFunctionPointer(control_cmd, typeof(ControlCmd)) as ControlCmd; } }
            public BinMsg BinMsg { get { return Marshal.GetDelegateForFunctionPointer(bin_msg, typeof(BinMsg)) as BinMsg; } }
            public AsyncCallback AsyncCallback { get { return Marshal.GetDelegateForFunctionPointer(async_callback, typeof(AsyncCallback)) as AsyncCallback; } }
        }

        [DllImport("<dllname>.dll")]
        private static extern int init_rvd(ref RVD_t rvd, int id);
        [DllImport("<dllname>.dll")]
        private static extern void close_rvd(ref RVD_t rvd);
        [DllImport("<dllname>.dll")]
        private static extern int req_cmd(int sn, string json);
        [DllImport("<dllname>.dll")]
        private static extern int _cmd(int sn, string json);

一绵牛 2015-12-01