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 [StructLayout(LayoutKind.Sequential)]
  18 class FormattedClass
  19 {
  20         public int i;
  21
  22         public FormattedClass(int i)
  23         {
  24                 this.i = i;
  25         }
  26 }
  27
  28 [StructLayout(LayoutKind.Sequential)]
  29 struct Struct
  30 {
  31         public int i;
  32
  33         public Struct(int i)
  34         {
  35                 this.i = i;
  36         }
  37 }
  38
  39 public class X {
  40         public static unsafe int Main () {
  41
  42                 ///
  43                 ///     Structure to pointer
  44                 ///
  45
  46                 Dummy dummy = new Dummy ();
  47                 dummy.a = new byte[16];
  48                 dummy.b = new float[16];
  49                 dummy.c = new long[16];
  50
  51                 for(int i=0; i<16; i++)
  52                         dummy.a[i] = (byte)(dummy.b[i] = dummy.c[i] = i+1);
  53
  54                 IntPtr p = Marshal.AllocHGlobal(Marshal.SizeOf(typeof(Dummy)));
  55                 Marshal.StructureToPtr(dummy, p, false);
  56
  57                 int offset = (int)Marshal.OffsetOf(typeof(Dummy), "a");
  58                 byte *data1 = (byte*)p.ToPointer() + offset;
  59                 for(int i=0; i<16; i++) {
  60                         if(data1[i] != i+1)
  61                                 return 1;
  62                 }
  63
  64                 offset = (int)Marshal.OffsetOf(typeof(Dummy), "b");
  65                 float *data2 = (float*)((byte*)p.ToPointer() + offset);
  66                 for(int i=0; i<16; i++)
  67                         if(data2[i] != i+1)
  68                                 return 2;
  69
  70                 offset = (int)Marshal.OffsetOf(typeof(Dummy), "c");
  71                 long *data3 = (long*)((byte*)p.ToPointer() + offset);
  72                 for(int i=0; i<16; i++)
  73                         if(data3[i] != i+1)
  74                                 return 3;
  75
  76                 ///
  77                 ///     Pointer to structure
  78                 ///
  79                 Dummy dummy2 = new Dummy ();
  80                 Marshal.PtrToStructure(p, dummy2);
  81
  82                 if(dummy2.a.Length != dummy.a.Length) return 4;
  83                 if(dummy2.b.Length != dummy.b.Length) return 5;
  84                 if(dummy2.c.Length != dummy.c.Length) return 6;
  85
  86                 for(int i=0; i<16; i++)
  87                 {
  88                         if(dummy2.a[i] != i+1) return 7;
  89                         if(dummy2.b[i] != i+1) return 8;
  90                         if(dummy2.c[i] != i+1) return 9;
  91                 }
  92
  93                 Marshal.FreeHGlobal(p);
  94
  95
  96                 ///
  97                 /// Only allow
  98                 ///
  99                 FormattedClass fc = new FormattedClass(20);
 100                 IntPtr fc_ptr = Marshal.AllocHGlobal(Marshal.SizeOf(typeof(FormattedClass)));
 101                 Marshal.StructureToPtr(fc, fc_ptr, false);
 102                 Marshal.PtrToStructure(fc_ptr, fc);
 103                 if (fc.i != 20)
 104                         return 10;
 105                 Marshal.FreeHGlobal(fc_ptr);
 106
 107                 bool exception = false;
 108                 try
 109                 {
 110                         object str = new Struct(20);
 111                         IntPtr str_ptr = Marshal.AllocHGlobal(Marshal.SizeOf(typeof(Struct)));
 112                         Marshal.StructureToPtr(str, str_ptr, false);
 113                         Marshal.PtrToStructure(str_ptr, str);
 114                         Marshal.FreeHGlobal(str_ptr);
 115                 }
 116                 catch (Exception ex)
 117                 {
 118                         exception = true;
 119                 }
 120                 if (!exception)
 121                         return 11;
 122
 123                 return 0;
 124         }
 125 }