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Common/DTS.Common.Utilities/.svn/pristine/8f/8f76b3cc999a3f44ee4bd8a8f72b0d2c901c8240.svn-base

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+
+//
+// Win32APIs.cs
+//    
+//    Implementation of a library to use Win32 Memory Mapped
+//    Files from within .NET applications
+//
+// COPYRIGHT (C) 2001, Tomas Restrepo (tomasr@mvps.org)
+//
+// This library is free software; you can redistribute it and/or
+// modify it under the terms of the GNU Lesser General Public
+// License as published by the Free Software Foundation; either
+// version 2.1 of the License, or (at your option) any later version.
+//
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+// Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public
+// License along with this library; if not, write to the Free Software
+// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+//
+
+using System;
+using System.IO;
+using System.Runtime.InteropServices;
+
+namespace DTS.Common.Utilities.IO.MemoryMap
+{
+
+    /// <summary>Win32 APIs used by the library</summary>
+    /// <remarks>
+    ///   Defines the PInvoke functions we use
+    ///   to access the FileMapping Win32 APIs
+    /// </remarks>
+    internal class Win32MapApis
+    {
+        [DllImport("kernel32", SetLastError = true, CharSet = CharSet.Auto)]
+        public static extern IntPtr CreateFile(
+           String lpFileName, int dwDesiredAccess, int dwShareMode,
+           IntPtr lpSecurityAttributes, int dwCreationDisposition,
+           int dwFlagsAndAttributes, IntPtr hTemplateFile);
+
+        [DllImport("kernel32", SetLastError = true, CharSet = CharSet.Auto)]
+        public static extern IntPtr CreateFileMapping(
+           IntPtr hFile, IntPtr lpAttributes, int flProtect,
+           int dwMaximumSizeLow, int dwMaximumSizeHigh,
+           String lpName);
+
+        [DllImport("kernel32", SetLastError = true)]
+        public static extern bool FlushViewOfFile(
+           IntPtr lpBaseAddress, int dwNumBytesToFlush);
+
+        [DllImport("kernel32", SetLastError = true)]
+        public static extern IntPtr MapViewOfFile(
+           IntPtr hFileMappingObject, int dwDesiredAccess, int dwFileOffsetHigh,
+           int dwFileOffsetLow, int dwNumBytesToMap);
+
+        [DllImport("kernel32", SetLastError = true, CharSet = CharSet.Auto)]
+        public static extern IntPtr OpenFileMapping(
+           int dwDesiredAccess, bool bInheritHandle, String lpName);
+
+        [DllImport("kernel32", SetLastError = true)]
+        public static extern bool UnmapViewOfFile(IntPtr lpBaseAddress);
+
+        [DllImport("kernel32", SetLastError = true)]
+        public static extern bool CloseHandle(IntPtr handle);
+
+        [DllImport("kernel32", SetLastError = false)]
+        public static extern int GetLastError();
+
+    } // class Win32MapApis
+
+}