c#调用c++dll 结构体指针的问题

c#调用c++dll?结构体指针的问题结构指针 c++dl函数 int _stdcall TA_ReadCardSimple(AccountMsg * pAccMsg); 结构体 typedef struct { char Name[21]; /姓名/ char SexNo[2]; /性别/ char DeptCode[19]; /部门代码/ unsigned int CardNo; /卡号/ unsigned int AccountNo; /帐号/ char StudentCode[21]; /学号/ char IDCard[21]; /身份证号/ char PID[3]; /身份代码/ char IDNo[13]; /身份序号/ int Balance; /现余额/ char Password[7]; /消费密码/ char ExpireDate[7]; /账户截止日期/ unsigned short SubSeq; /补助戳/ char IsOpenInSys; /是否在本系统内开通/ short TerminalNo; /终端号码,提取补助时需要填写/ short RetCode; /后台处理返回值/ char Flag[16]; /状态(2004-08-26增加)/ char Pad[84]; /预留字段/ } AccountMsg; 我在c#里面引用 [DllImport(“AIO_API.dll”)] public static extern int TA_ReadCardSimple(ref IntPtr pAccMsg); 定义结构体 [StructLayout(LayoutKind.Sequential)] public struct AccountMsg { [MarshalAs(UnmanagedType.ByValArray, SizeConst = 21)] public byte[] Name; /姓名/ [MarshalAs(UnmanagedType.ByValArray, SizeConst = 2)] public byte[] SexNo; /性别/ [MarshalAs(UnmanagedType.ByValArray, SizeConst = 19)] public byte[] DeptCode; /部门代码/ [MarshalAs(UnmanagedType.U4)] public uint CardNo; /卡号/ [MarshalAs(UnmanagedType.U4)] public uint AccountNo; /帐号/ [MarshalAs(UnmanagedType.ByValArray, SizeConst = 21)] public byte[] StudentCode; /学号/ [MarshalAs(UnmanagedType.ByValArray, SizeConst = 21)] public byte[] IDCard; /身份证号/ [MarshalAs(UnmanagedType.ByValArray, SizeConst = 3)] public byte[] PID; /身份代码/ [MarshalAs(UnmanagedType.ByValArray, SizeConst = 13)] public byte[] IDNo; /身份序号/ [MarshalAs(UnmanagedType.U4)] public uint Balance; /现余额/ [MarshalAs(UnmanagedType.ByValArray, SizeConst = 7)] public byte[] Password; /消费密码/ [MarshalAs(UnmanagedType.ByValArray, SizeConst = 7)] public byte[] ExpireDate; /账户截止日期/ [MarshalAs(UnmanagedType.U4)] public uint SubSeq; /补助戳/ [MarshalAs(UnmanagedType.U1)] public byte IsOpenInSys; /是否在本系统内开通/ [MarshalAs(UnmanagedType.U4)] public uint TerminalNo; /终端号码,提取补助时需要填写/ [MarshalAs(UnmanagedType.U4)] public uint RetCode; /后台处理返回值/ [MarshalAs(UnmanagedType.ByValArray, SizeConst = 16)] public byte[] Flag; /状态(2004-08-26增加)/ [MarshalAs(UnmanagedType.ByValArray, SizeConst = 84)] public byte[] Pad; /预留字段/ } 调用 IntPtr[] ptArray = new IntPtr[1]; ptArray[0] = Marshal.AllocHGlobal(Marshal.SizeOf(typeof(AccountMsg)) * 1); IntPtr pt = Marshal.AllocHGlobal(Marshal.SizeOf(typeof(AccountMsg))); Marshal.Copy(ptArray, 0, pt, 1); int a = TA_ReadCardSimple(ref pt); msg1[0] = (AccountMsg)Marshal.PtrToStructure((IntPtr)((UInt32)pt + 0 * Marshal.SizeOf(typeof(AccountMsg))) , typeof(AccountMsg)); MessageBox.Show(Convert.ToByte(msg1[0].Name[0]).ToString()); 在倒数第二句报引发类型为“System.ExecutionEngineException”的异常。谁能帮看看谢谢
	直接将C#里面的结构体申明成string 类型，长度和C++结构体的长度一样就可以了，就象这样 // using System.Runtime.InteropServices; struct tagTest { [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 50)] public string sName; }
	你说的这种试过了，但是还是这个异常
100分	确认下c++函数的定义，如果传回来的是单个结构体 [DllImport("AIO_API.dll", EntryPoint = "TA_ReadCardSimple", CharSet = CharSet.Ansi, CallingConvention = CallingConvention.StdCall)] public static extern int TA_ReadCardSimple(ref AccountMsg pAccountMsg); 同时在AccountMsg 结构体定义上加上这个声明 [StructLayout(LayoutKind.Sequential, CharSet = CharSet.Ansi, Pack = 1)] 保证字节对齐应该就可以了

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