200分求C的DLL在C#调用时类型和结构转换方法

Question

typedef struct {
unsigned long ek[32];
unsigned long dk[32];
} des_ctx;EXPORT void des_dec(des_ctx *dc,unsigned char *data,int blocks);
EXPORT void des_enc(des_ctx *dc,unsigned char *data,int blocks);
EXPORT void des_key(des_ctx *dc,unsigned char *key);在C# 下该如何调用？
先到先得！

Answer 1

        [System.Runtime.InteropServices.StructLayout(System.Runtime.InteropServices.LayoutKind.Sequential,Pack=4)]
      public  struct des_ctx
        {
         [System.Runtime.InteropServices.MarshalAs(System.Runtime.InteropServices.UnmanagedType.ByValArray,SizeConst=32)]
         public   uint[] ek;
         [System.Runtime.InteropServices.MarshalAs(System.Runtime.InteropServices.UnmanagedType.ByValArray, SizeConst = 32)]
         public  uint[]  dk;
         }        [System.Runtime.InteropServices.DllImport("你要调用的dll名称", ExactSpelling = true)]
        public static extern void des_dec(ref des_ctx dc, sbyte[] data, int blocks);        [System.Runtime.InteropServices.DllImport("你要调用的dll名称", ExactSpelling = true)]
        public static extern void des_enc(ref des_ctx dc, sbyte[] data, int blocks);        [System.Runtime.InteropServices.DllImport("你要调用的dll名称", ExactSpelling = true)]
        public static extern void des_key(ref des_ctx dc, sbyte[] data); 

Answer 2

   [StructLayout(LayoutKind.Sequential, CharSet = CharSet.Ansi)]
    public struct des_ctx
    {
        [MarshalAs(UnmanagedType.ByValArray, ArraySubType = UnmanagedType.SysUInt, SizeConst = 32)]
        public UInt32[] ek;
        [MarshalAs(UnmanagedType.ByValArray, ArraySubType = UnmanagedType.SysUInt, SizeConst = 32)]        public UInt32[] dk;
    }
    [DllImport("3DES.dll")]
        public static extern void des_dec(ref  des_ctx dc, [MarshalAs(UnmanagedType.LPArray)]byte[] data, int blocks);
        [DllImport("3DES.dll")]
        public static extern void des_enc(ref  des_ctx dc, [MarshalAs(UnmanagedType.LPArray)]byte[] data, int blocks);
        [DllImport("3DES.dll")]
        public static extern void des_key(ref  des_ctx dc, [MarshalAs(UnmanagedType.LPArray)]byte[] key);