是否有Windows 7的预览处理程序VCL？ [英] Is there a Preview Handler VCL for Windows 7?

问题描述

这篇文章

http://msdn.microsoft.com/en-gb/library/bb776867.aspx

描述Windows中的预览处理程序为

describes preview handlers in Windows as

当
项目被选中显示
轻量级，丰富的只读预览
时，调用预处理程序视图的
阅读窗格中的文件内容。没有
启动文件关联的
应用程序，这是完成的。

Preview handlers are called when an item is selected to show a lightweight, rich, read-only preview of the file's contents in the view's reading pane. This is done without launching the file's associated application.

和...

预览处理程序是托管的
应用程序。主机包括Windows
Vista或Microsoft Outlook 2007中的
Microsoft Windows资源管理器。

A preview handler is a hosted application. Hosts include the Microsoft Windows Explorer in Windows Vista or Microsoft Outlook 2007.

是否有一些Delphi VCL代码可以用作这样的处理程序的起点？

Is there some Delphi VCL code which can be used as a startingpoint for such a handler?

推荐答案

@Mjn，对，知道我写一篇文章我的博客从Delphi实现预览处理程序，但由于缺乏时间，我不知道这是完成的正如其他用户目前提到的，Delphi中没有VCL组件来实现预览处理程序，以前我为客户实现了一些预览处理程序，但是使用Delphi-Prism和C＃。

@Mjn, right know i'am writing an article for my blog to implement Preview Handlers from Delp but due to lack of time, I do not know when this is complete, as others users mention by the moment no exist a VCL component in Delphi to implement preview handlers, in the past i implement a couple of preview handlers for a customer but using Delphi-Prism and C#.

作为起点，如果你想开始你自己的项目，这里我留下一些提示。

as starting point if you wanna start your own project, here i leave some tips.

• 您必须使用 IPreviewHandler ，InitializeWithFile， InitializeWithStream ， IPreviewHandlerFrame ，IPreviewHandlerVisuals界面。

• You must use the IPreviewHandler, InitializeWithFile, InitializeWithStream, IPreviewHandlerFrame, IPreviewHandlerVisuals interfaces.

这是这些接口的标头的delphi翻译

this is the delphi translation of the headers of these interfaces

uses
  Windows, ActiveX, AxCtrls, ShlObj, ComObj;

type


  IIPreviewHandler = interface(IUnknown)
    ['{8895b1c6-b41f-4c1c-a562-0d564250836f}']
    function SetWindow(hwnd: HWND; var RectangleRef: TRect): HRESULT; stdcall;
    function SetRect(var RectangleRef: TRect): HRESULT; stdcall;
    function DoPreview(): HRESULT; stdcall;
    function Unload(): HRESULT; stdcall;
    function SetFocus(): HRESULT; stdcall;
    function QueryFocus(phwnd: HWND): HRESULT; stdcall;
    function TranslateAccelerator(PointerToWindowMessage: MSG): HRESULT; stdcall;
  end;

  IInitializeWithFile = interface(IUnknown)
    ['{b7d14566-0509-4cce-a71f-0a554233bd9b}']
    function Initialize(pszFilePath: LPWSTR; grfMode: DWORD):HRESULT;stdcall;
  end;

  IInitializeWithStream = interface(IUnknown)
    ['{b824b49d-22ac-4161-ac8a-9916e8fa3f7f}']
    function Initialize(pstream: IStream; grfMode: DWORD): HRESULT; stdcall;
  end;

  IIPreviewHandlerFrame = interface(IUnknown)
    ['{fec87aaf-35f9-447a-adb7-20234491401a}']
    function GetWindowContext(pinfo: HWND): HRESULT; stdcall;
    function TranslateAccelerator(PointerToWindowMessage: MSG): HRESULT; stdcall;
  end;

  IIPreviewHandlerVisuals = interface(IUnknown)
    ['{8327b13c-b63f-4b24-9b8a-d010dcc3f599}']
        function SetBackgroundColor(color: COLORREF ): HRESULT; stdcall;
        function SetFont(plf:LOGFONTW): HRESULT; stdcall;  
        function SetTextColor(color: COLORREF): HRESULT; stdcall;
  end;

• 您必须使用从这些界面下降的类创建一个com dll IIPreviewHandler，IIPreviewHandlerVisuals，IOleWindow，IObjectWithSite来管理可视化，第二个类加载要显示的文件。这个类必须从 IPreviewHandler ， IInitializeWithStream 下降。


• you must create a com dll with a class which descend from these interfaces IIPreviewHandler, IIPreviewHandlerVisuals, IOleWindow, IObjectWithSite to manage the visualization and a second class to load the files to show. this class must descend from IPreviewHandler, IInitializeWithStream.

这样的事情

  TMyPreviewHandler = class(IIPreviewHandler, IIPreviewHandlerVisuals, IOleWindow, IObjectWithSite)

  TMyStream = class(IIPreviewHandler, IInitializeWithStream, IStream)








• 现在您必须创建自己的父接口方法的实现。
  这是您需要实现的方法的列表。

  • now you must create your own implementation of the methods for the parent interfaces. this is the list of the methods which you need implement.

    IPreviewHandler - > DoPreview，SetWindow，SetRect，Unload，SetFocus ，TranslateAccelerator，QueryFocus。

    IPreviewHandler -> DoPreview, SetWindow, SetRect, Unload, SetFocus, TranslateAccelerator, QueryFocus.

    IObjectWithSite - > GetSite，SetSite。

    IObjectWithSite -> GetSite, SetSite.

    strong> IOleWindow - > GetWindow

    IOleWindow -> GetWindow

    IPreviewHandlerVisuals - > SetBackgroundColor，SetFont，SetColor

    IPreviewHandlerVisuals - > SetBackgroundColor, SetFont, SetColor

    InitializeWithStream - >初始化

    最后，您必须在系统中注册您的com以及文件扩展名将使用您的PrevieHandler类。

    finally you must register your com in the system as well as the file extensions which will use you PrevieHandler class.

    将此项目作为起点 Windows预览处理程序包 （以C＃编写）和本文 使用我们的管理预览处理程序查看数据ork

    check this project as a starting point Windows Preview Handler Pack (is written in C#) and this article View Data Your Way With Our Managed Preview Handler Framework

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