// Copyright © 2016 The CefSharp Authors. All rights reserved.
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//
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// Use of this source code is governed by a BSD-style license that can be found in the LICENSE file.
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using System;
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using System.IO;
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using System.Runtime.InteropServices;
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namespace CefSharp
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{
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/// <summary>
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/// CefLibraryHandle is a SafeHandle that Loads libcef.dll and relesases it when disposed/finalized
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/// Calls LoadLibraryEx with LoadLibraryFlags.LOAD_WITH_ALTERED_SEARCH_PATH
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/// Make sure to set settings.BrowserSubprocessPath and settings.LocalesDirPath
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/// </summary>
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/// <remarks>Adapted from http://www.pinvoke.net/default.aspx/kernel32.loadlibraryex</remarks>
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public class CefLibraryHandle : SafeHandle
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{
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/// <summary>
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/// In general not a fan of having inline classes/enums
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/// In this case it's not something that I'd like to see exposed
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/// as it's just a helper and outside the scope of the project
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/// </summary>
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[Flags]
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private enum LoadLibraryFlags : uint
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{
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DONT_RESOLVE_DLL_REFERENCES = 0x00000001,
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LOAD_IGNORE_CODE_AUTHZ_LEVEL = 0x00000010,
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LOAD_LIBRARY_AS_DATAFILE = 0x00000002,
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LOAD_LIBRARY_AS_DATAFILE_EXCLUSIVE = 0x00000040,
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LOAD_LIBRARY_AS_IMAGE_RESOURCE = 0x00000020,
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LOAD_WITH_ALTERED_SEARCH_PATH = 0x00000008
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}
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/// <summary>
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/// Default constructor
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/// </summary>
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/// <param name="path">libcef.dll full path.</param>
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public CefLibraryHandle(string path) : base(IntPtr.Zero, true)
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{
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if (!File.Exists(path))
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{
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throw new FileNotFoundException("NotFound", path);
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}
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var handle = LoadLibraryEx(path, IntPtr.Zero, LoadLibraryFlags.LOAD_WITH_ALTERED_SEARCH_PATH);
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base.SetHandle(handle);
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}
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/// <summary>
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/// When overridden in a derived class, gets a value indicating whether the handle value is invalid.
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/// </summary>
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/// <value>
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/// true if the handle value is invalid; otherwise, false.
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/// </value>
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public override bool IsInvalid
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{
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get { return this.handle == IntPtr.Zero; }
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}
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/// <summary>
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/// When overridden in a derived class, executes the code required to free the handle.
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/// </summary>
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/// <returns>
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/// true if the handle is released successfully; otherwise, in the event of a catastrophic failure, false. In this case, it
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/// generates a releaseHandleFailed MDA Managed Debugging Assistant.
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/// </returns>
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protected override bool ReleaseHandle()
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{
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return FreeLibrary(this.handle);
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}
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[DllImport("kernel32.dll", SetLastError = true)]
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private static extern IntPtr LoadLibraryEx(string lpFileName, IntPtr hReservedNull, LoadLibraryFlags dwFlags);
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[DllImport("kernel32.dll", SetLastError = true)]
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[return: MarshalAs(UnmanagedType.Bool)]
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private static extern bool FreeLibrary(IntPtr hModule);
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}
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}
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