mono/tests/marshal8.cs

   1 using System;
   2 using System.Runtime.InteropServices;
   3
   4
   5 [StructLayout(LayoutKind.Sequential, Size=1024)]
   6 public class Dummy {
   7         [MarshalAs(UnmanagedType.ByValArray, SizeConst=16)]
   8         public byte[]   a;
   9
  10         [MarshalAs(UnmanagedType.ByValArray, SizeConst=16)]
  11         public float[]  b;
  12
  13         [MarshalAs(UnmanagedType.ByValArray, SizeConst=16)]
  14         public long[]   c;
  15 }
  16
  17 public class X {
  18         public static unsafe int Main () {
  19
  20                 ///
  21                 ///     Structure to pointer
  22                 ///
  23
  24                 Dummy dummy = new Dummy ();
  25                 dummy.a = new byte[16];
  26                 dummy.b = new float[16];
  27                 dummy.c = new long[16];
  28
  29                 for(int i=0; i<16; i++)
  30                         dummy.a[i] = (byte)(dummy.b[i] = dummy.c[i] = i+1);
  31
  32                 IntPtr p = Marshal.AllocHGlobal(Marshal.SizeOf(typeof(Dummy)));
  33                 Marshal.StructureToPtr(dummy, p, false);
  34
  35                 int offset = (int)Marshal.OffsetOf(typeof(Dummy), "a");
  36                 byte *data1 = (byte*)p.ToPointer() + offset;
  37                 for(int i=0; i<16; i++) {
  38                         if(data1[i] != i+1)
  39                                 return 1;
  40                 }
  41
  42                 offset = (int)Marshal.OffsetOf(typeof(Dummy), "b");
  43                 float *data2 = (float*)((byte*)p.ToPointer() + offset);
  44                 for(int i=0; i<16; i++)
  45                         if(data2[i] != i+1)
  46                                 return 2;
  47
  48                 offset = (int)Marshal.OffsetOf(typeof(Dummy), "c");
  49                 long *data3 = (long*)((byte*)p.ToPointer() + offset);
  50                 for(int i=0; i<16; i++)
  51                         if(data3[i] != i+1)
  52                                 return 3;
  53
  54                 ///
  55                 ///     Pointer to structure
  56                 ///
  57                 Dummy dummy2 = new Dummy ();
  58                 Marshal.PtrToStructure(p, dummy2);
  59
  60                 if(dummy2.a.Length != dummy.a.Length) return 4;
  61                 if(dummy2.b.Length != dummy.b.Length) return 5;
  62                 if(dummy2.c.Length != dummy.c.Length) return 6;
  63
  64                 for(int i=0; i<16; i++)
  65                 {
  66                         if(dummy2.a[i] != i+1) return 7;
  67                         if(dummy2.b[i] != i+1) return 8;
  68                         if(dummy2.c[i] != i+1) return 9;
  69                 }
  70
  71                 Marshal.FreeHGlobal(p);
  72
  73                 return 0;
  74         }
  75 }