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comparison 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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75:50d4aed66c67 76:b05350c24596
1 using System;
2 using System.Collections.Generic;
3 using System.Text;
4 using System.IO;
5 using System.Runtime.InteropServices;
6
7 namespace UCIS.Util {
8 public class PinnedObject : SafeHandle {
9 GCHandle gch;
10 public PinnedObject(Object obj)
11 : base(IntPtr.Zero, true) {
12 gch = GCHandle.Alloc(obj, GCHandleType.Pinned);
13 SetHandle(gch.AddrOfPinnedObject());
14 }
15 public override bool IsInvalid { get { return handle == IntPtr.Zero; } }
16 protected override bool ReleaseHandle() {
17 if (gch.IsAllocated) {
18 gch.Free();
19 return true;
20 } else {
21 return false;
22 }
23 }
24 public static implicit operator IntPtr(PinnedObject p) { return p.DangerousGetHandle(); }
25 public static implicit operator PinnedObject(Array o) { return new PinnedObject(o); }
26 }
27 public class PinnedString : SafeHandle {
28 public PinnedString(String str, Boolean unicode)
29 : base(IntPtr.Zero, true) {
30 SetHandle(unicode ? Marshal.StringToHGlobalUni(str) : Marshal.StringToHGlobalAnsi(str));
31 }
32 public override bool IsInvalid { get { return handle == IntPtr.Zero; } }
33 protected override bool ReleaseHandle() {
34 Marshal.FreeHGlobal(handle);
35 return true;
36 }
37 public static implicit operator IntPtr(PinnedString p) { return p.DangerousGetHandle(); }
38 }
39 public class PinnedStringAnsi : PinnedString {
40 public PinnedStringAnsi(String str) : base(str, false) { }
41 public static implicit operator PinnedStringAnsi(String s) { return new PinnedStringAnsi(s); }
42 }
43 public class PinnedStringUni : PinnedString {
44 public PinnedStringUni(String str) : base(str, true) { }
45 public static implicit operator PinnedStringUni(String s) { return new PinnedStringUni(s); }
46 }
47 }