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。

**

欢迎各位朋友提出宝贵意见

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