mono/tests/marshal6.cs

   1 using System;
   2 using System.Runtime.InteropServices;
   3
   4
   5 [StructLayout(LayoutKind.Explicit, Size=32)]
   6 public class Dummy {
   7         [MarshalAs(UnmanagedType.ByValTStr, SizeConst=16)]
   8         [FieldOffset(0)]
   9         public string   a;
  10 }
  11
  12 public class X {
  13         public static int Main () {
  14                 Dummy dummy = new Dummy ();
  15                 dummy.a = "abcd";
  16
  17                 IntPtr p = Marshal.AllocHGlobal(Marshal.SizeOf(typeof(Dummy)));
  18                 Marshal.StructureToPtr(dummy, p, false);
  19
  20                 if(Marshal.ReadByte(p, 0) != 0x61) {
  21                         return 1;
  22                 }
  23                 if(Marshal.ReadByte(p, 1) != 0x62) {
  24                         return 1;
  25                 }
  26                 if(Marshal.ReadByte(p, 2) != 0x63) {
  27                         return 1;
  28                 }
  29                 if(Marshal.ReadByte(p, 3) != 0x64) {
  30                         return 1;
  31                 }
  32                 return 0;
  33         }
  34 }