C# 封装 C++的dll

C++结构体struct SGP_ANALYTIC_TEMP{    int rule_id;         char rule_name[50];       float max_temp; };  C#对应的结构体声明[StructLayout(LayoutKind.Sequential, CharSet = CharSet.Ansi)]public struct SGP_ANALYTIC_TEMP{    public int rule_id = 0;        [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 50)]    public string rule_name="123";       public float max_temp = 0;//最高温度值}

C++结构体struct SGP_GENERAL_INFO{              int range_num;//测温范围数量              SGP_RANGE range[3];//测温范围              char vl_rtsp_url[50];//可见光主码流rtsp地址};C++ 函数类型 int SGP_GetGeneralInfo(SGP_HANDLE handle, SGP_GENERAL_INFO *output);C# 对应的结构体[StructLayout(LayoutKind.Sequential, CharSet = CharSet.Ansi)]public struct SGP_GENERAL_INFO{        public int range_num ;//测温范围数量       [MarshalAs(UnmanagedType.ByValArray, SizeConst = 3)]    public SGP_RANGE[] range;//测温范围    [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 50)]    public string vl_sub_rtsp_url;//可见光辅码流rtsp地址}C# 函数类型[DllImport(sdkPath, EntryPoint = "SGP_GetGeneralInfo", CharSet = CharSet.Ansi, CallingConvention = CallingConvention.Cdecl)]public static extern int SGP_GetGeneralInfo(IntPtr handle, ref SGP_GENERAL_INFO output);