身份证刷卡 System.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。

#region

[StructLayout(LayoutKind.Sequential, CharSet = CharSet.Unicode, Pack = 8)]
        public struct PERSONINFOW
        {
            [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 16)]
            public string name;
            [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 2)]
            public string sex;
            [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 10)]
            public string nation;
            [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 10)]
            public string birthday;
            [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 36)]
            public string address;
            [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 20)]
            public string cardId;
            [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 16)]
            public string police;
            [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 10)]
            public string validStart;
            [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 10)]
            public string validEnd;
            [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 2)]
            public string sexCode;
            [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 4)]
            public string nationCode;
            [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 36)]
            public string appendMsg;
        }

#endregion

#region
    
        [DllImport("cardapi3.dll", EntryPoint = "OpenCardReader", CharSet = CharSet.Unicode, CallingConvention = CallingConvention.StdCall)]
        public static extern Int32 OpenCardReader(Int32 lPort, UInt32 ulFlag, UInt32 ulBaudRate);

        [DllImport("cardapi3.dll", EntryPoint = "GetPersonMsgW", CharSet = CharSet.Unicode, CallingConvention = CallingConvention.Cdecl)]
        public static extern Int32 GetPersonMsgW(ref PERSONINFOW pInfo,string pszImageFile);

        [DllImport("cardapi3.dll", EntryPoint = "CloseCardReader", CharSet = CharSet.Unicode, CallingConvention = CallingConvention.Cdecl)]
        public static extern Int32 CloseCardReader();

        [DllImport("cardapi3.dll", EntryPoint = "GetErrorTextW", CharSet = CharSet.Unicode, CallingConvention = CallingConvention.Cdecl)]
        public static extern void GetErrorTextW(StringBuilder pszBuffer, UInt32 dwBufLen);

        [DllImport("cardapi3.dll", EntryPoint = "ResetCardReader", CharSet = CharSet.Unicode, CallingConvention = CallingConvention.Cdecl)]
        public static extern Int32 ResetCardReader();
#endregion

  设置返回的ref参数为static 解决……