再谈利用SharpShell实现Windows Shell扩展

之前写过一篇文章介绍过如何用SharpShell提供的接口去实现Windows PreviewHandler的扩展功能，但用的方法是先实现SharpShell中的各类接口编译DLL，再手动给注册表安装和注册相关内容，但发现这种方法有点折腾，而且不便于部署，后来发现SharpShell本来就自带注册表管理器，使用起来非常方便，而且可以避免自己写注册表出现疏忽。

Windows PreviewHandler其实是一个COM组件，要实现某种特定文件格式在资源管理器中的预览，需要以下几步
1.注册你的自定义文件后缀
[HKEY_CLASSES_ROOT.example]
@=”examplefile”
2.注册你的PreviewHandler组件
[HKEY_CLASSES_ROOT\CLSID{de6d955a-ba3a-4ce6-962f-85bcfb8bf37f}]
@=”HidasPreview”
“AppID”=”{de6d955a-ba3a-4ce6-962f-85bcfb8bf380}”
“DisplayName”=”HidasPreview”
“Icon”=hex(2):25,00,53,00,79,00,73,00,74,00,65,00,6d,00,52,00,6f,00,6f,00,74,\
00,25,00,5c,00,73,00,79,00,73,00,74,00,65,00,6d,00,33,00,32,00,5c,00,66,00,\
6f,00,6e,00,74,00,65,00,78,00,74,00,2e,00,64,00,6c,00,6c,00,2c,00,31,00,30,\
00,00,00

[HKEY_CLASSES_ROOT\CLSID\{de6d955a-ba3a-4ce6-962f-85bcfb8bf37f}\InprocServer32]@="mscoree.dll""Assembly"="HidasRegistry, Version=1.0.0.0, Culture=neutral, PublicKeyToken=87a8ebc60c5813a4""Class"="HidasPreview.HidasPreview""RuntimeVersion"="v4.0.30319""ThreadingModel"="Both""CodeBase"="file:///E:/VS Projects/PreviewHandlerSample/HidasRegistry/bin/Release/HidasRegistry.exe"[HKEY_CLASSES_ROOT\CLSID\{de6d955a-ba3a-4ce6-962f-85bcfb8bf37f}\InprocServer32\1.0.0.0]"Assembly"="HidasRegistry, Version=1.0.0.0, Culture=neutral, PublicKeyToken=87a8ebc60c5813a4""Class"="HidasPreview.HidasPreview""RuntimeVersion"="v4.0.30319""CodeBase"="file:///E:/VS Projects/PreviewHandlerSample/HidasRegistry/bin/Release/HidasRegistry.exe"

3.为你的自定义文件注册对应的PreviewHandler
[HKEY_CLASSES_ROOT\higetfile\shellex{8895b1c6-b41f-4c1c-a562-0d564250836f}]
@=”{de6d955a-ba3a-4ce6-962f-85bcfb8bf37f}”

可以看到，第二步中注册的程序其实是mscoree.dll，也就是.net虚拟机的初始库，而它的参数则是我们编译的SharpShell程序相关内容，包括程序地址、调用的类以及.NET版本等等。

回来再看程序代码部分，我在代码中继承实现了一个SharpPreviewHandler类

using SharpShell.Attributes;using SharpShell.SharpPreviewHandler;using System;using System.Collections.Generic;using System.Linq;using System.Runtime.InteropServices;using System.Text;namespace HidasPreview{    /// <summary>    /// The IconPreviewHandler is a preview handler that shows the icons contained    /// in an ico file.    /// </summary>    [ComVisible(true)]    [COMServerAssociation(AssociationType.ClassOfExtension, ".example")]    [Guid("DE6D955A-BA3A-4CE6-962F-85BCFB8BF37F")]    [PreviewHandler]    public class HidasPreview : SharpPreviewHandler    {        /// <summary>        /// DoPreview must create the preview handler user interface and initialize it with data        /// provided by the shell.        /// </summary>        /// <returns>        /// The preview handler user interface.        /// </returns>        protected override PreviewHandlerControl DoPreview()        {            //  Create the handler control.            var handler = new HidasPreviewHandlerControl();            //  Do we have a file path? If so, we can do a preview.            if (!string.IsNullOrEmpty(SelectedFilePath))                handler.DoPreview(SelectedFilePath);            //  Return the handler control.            return handler;        }    }}

可以看到，DoPreview程序主要作用是给资源管理器返回一个PreviewHandlerControl（继承于UserControl）

然后我们可以在程序入口中加入PreviewHandler的注册和删除方法

using System;using System.Collections.Generic;using System.Linq;using System.Text;using HidasPreview;using HidasIconHandler;namespace HidasRegistry{    class Program    {        static void Main(string[] args)        {            HidasPreview.HidasPreview preview = new HidasPreview.HidasPreview();            HidasIconHandler.HidasIconHandler icon = new HidasIconHandler.HidasIconHandler();            if (args.Length == 1 && args[0] == "-a")            {                SharpShell.ServerRegistration.ServerRegistrationManager.InstallServer(preview, SharpShell.ServerRegistration.RegistrationType.OS32Bit, true);                SharpShell.ServerRegistration.ServerRegistrationManager.InstallServer(preview, SharpShell.ServerRegistration.RegistrationType.OS64Bit, true);                SharpShell.ServerRegistration.ServerRegistrationManager.RegisterServer(preview, SharpShell.ServerRegistration.RegistrationType.OS32Bit);                SharpShell.ServerRegistration.ServerRegistrationManager.RegisterServer(preview, SharpShell.ServerRegistration.RegistrationType.OS64Bit);                SharpShell.ServerRegistration.ServerRegistrationManager.InstallServer(icon, SharpShell.ServerRegistration.RegistrationType.OS32Bit, true);                SharpShell.ServerRegistration.ServerRegistrationManager.InstallServer(icon, SharpShell.ServerRegistration.RegistrationType.OS64Bit, true);                SharpShell.ServerRegistration.ServerRegistrationManager.RegisterServer(icon, SharpShell.ServerRegistration.RegistrationType.OS32Bit);                SharpShell.ServerRegistration.ServerRegistrationManager.RegisterServer(icon, SharpShell.ServerRegistration.RegistrationType.OS64Bit);            }            if (args.Length == 1 && args[0] == "-d")            {                SharpShell.ServerRegistration.ServerRegistrationManager.UnregisterServer(preview, SharpShell.ServerRegistration.RegistrationType.OS32Bit);                SharpShell.ServerRegistration.ServerRegistrationManager.UninstallServer(preview, SharpShell.ServerRegistration.RegistrationType.OS32Bit);                SharpShell.ServerRegistration.ServerRegistrationManager.UnregisterServer(preview, SharpShell.ServerRegistration.RegistrationType.OS64Bit);                SharpShell.ServerRegistration.ServerRegistrationManager.UninstallServer(preview, SharpShell.ServerRegistration.RegistrationType.OS64Bit);                SharpShell.ServerRegistration.ServerRegistrationManager.UnregisterServer(icon, SharpShell.ServerRegistration.RegistrationType.OS32Bit);                SharpShell.ServerRegistration.ServerRegistrationManager.UninstallServer(icon, SharpShell.ServerRegistration.RegistrationType.OS32Bit);                SharpShell.ServerRegistration.ServerRegistrationManager.UnregisterServer(icon, SharpShell.ServerRegistration.RegistrationType.OS64Bit);                SharpShell.ServerRegistration.ServerRegistrationManager.UninstallServer(icon, SharpShell.ServerRegistration.RegistrationType.OS64Bit);                Console.WriteLine("deleted");            }                Console.WriteLine(args.Length);            foreach(var v in args)                Console.WriteLine(v);        }    }}

ServerRegistration**

可以帮我们完成上述的步骤2和3，至于步骤1，我们还是需要写一个注册表项让自定义文件和后缀名关联起来。

**

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