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annotate Util/InteropUtil.cs @ 76:b05350c24596

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Added InteropUtil for safe pinned array and string access
author Ivo Smits <Ivo@UCIS.nl>
date Mon, 03 Feb 2014 22:53:58 +0100
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b05350c24596 Added InteropUtil for safe pinned array and string access
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1 ???using System;
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2 using System.Collections.Generic;
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3 using System.Text;
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4 using System.IO;
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5 using System.Runtime.InteropServices;
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6
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7 namespace UCIS.Util {
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8 public class PinnedObject : SafeHandle {
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9 GCHandle gch;
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10 public PinnedObject(Object obj)
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11 : base(IntPtr.Zero, true) {
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12 gch = GCHandle.Alloc(obj, GCHandleType.Pinned);
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13 SetHandle(gch.AddrOfPinnedObject());
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14 }
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15 public override bool IsInvalid { get { return handle == IntPtr.Zero; } }
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16 protected override bool ReleaseHandle() {
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17 if (gch.IsAllocated) {
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18 gch.Free();
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19 return true;
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20 } else {
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21 return false;
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22 }
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23 }
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24 public static implicit operator IntPtr(PinnedObject p) { return p.DangerousGetHandle(); }
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25 public static implicit operator PinnedObject(Array o) { return new PinnedObject(o); }
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26 }
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27 public class PinnedString : SafeHandle {
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28 public PinnedString(String str, Boolean unicode)
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29 : base(IntPtr.Zero, true) {
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30 SetHandle(unicode ? Marshal.StringToHGlobalUni(str) : Marshal.StringToHGlobalAnsi(str));
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31 }
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32 public override bool IsInvalid { get { return handle == IntPtr.Zero; } }
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33 protected override bool ReleaseHandle() {
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34 Marshal.FreeHGlobal(handle);
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35 return true;
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36 }
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37 public static implicit operator IntPtr(PinnedString p) { return p.DangerousGetHandle(); }
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38 }
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39 public class PinnedStringAnsi : PinnedString {
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40 public PinnedStringAnsi(String str) : base(str, false) { }
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41 public static implicit operator PinnedStringAnsi(String s) { return new PinnedStringAnsi(s); }
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42 }
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43 public class PinnedStringUni : PinnedString {
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44 public PinnedStringUni(String str) : base(str, true) { }
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45 public static implicit operator PinnedStringUni(String s) { return new PinnedStringUni(s); }
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46 }
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47 }