Hosting Preview Handlers in Windows Forms Applications. Preview Handlers are a concept introduced in Windows Vista (and supported in later operating systems). Most prominently used by Windows Explorer (and notably in Outlook 2. You might use them to preview documents in a custom file explorer, or from somewhere that Windows Explorer cannot go, such as files stored as BLOBs in a database. Any exercise that involves reviewing or managing documents benefits extremely from a mechanism that will preview the content without opening another program, and this is it! From an implementation perspective, preview handlers are basically borderless windows that are bound to a window or control in your application.

Their operation and content can be controlled, but their UI is isolated. Free Microsoft Word 2007 Tutorial Video. All preview handlers implement the COM interface IPreview. Handler and are associated with file formats within the Windows Registry. At the time of writing, there is no official managed API for hosting preview handlers in Windows Forms applications, so I have written my own. Windows Forms app with an embedded Microsoft Word previewer. In my implementation, Preview.

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Handler. Host is a custom control to which the preview handler is bound. With each filename/stream that is opened, the appropriate handler is loaded and displayed. Download Free Dvd Burner Software Full Version more. To display a preview handler in a Windows Forms app, given the filename of the content you want to preview, the following must be performed: Locate the registry key in HKEY. Within the Shell. Ex key, there should be a key with the GUID . Within this key, there should be a GUID that identifies the COM type that implements IPreview.

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Handler. If you cannot locate the key here, try the file type’s class key – this corresponds to the default value of the first key mentioned above. Guid Get. Preview. Handler. GUID(string filename) . If you resize the control while a preview handler is active, it will be resized accordingly. If no file has been loaded or an error is encountered, it will be displayed on the empty control. You can also explicitly unload a file by calling Unload.

Preview. Handler(). Preview handlers may have transparent backgrounds (for example, the Microsoft Office handlers use rounded borders), so the control permits this. Final Words. Preview handlers are a powerful addition to file explorers, document management systems and the like, and they can be harnessed for use in . NET as well. Unfortunately, however, they are not the only mechanism that Windows Explorer and other previewers use to display content. Under Vista and Windows 7, for example, there are no preview handlers registered for images, plain text documents or HTML files.

That means that Preview. Handler. Host is far from a holistic solution. Rather, it should be combined with existing constructs to preview a fuller range of file formats. However, in testing I was able to demonstrate support for most major office document formats and media files. I hope you find it useful.