C＃通过Windows API的文件从获取缩略图 [英] C# get thumbnail from file via windows api

问题描述

Windows资源管理器显示文件的缩略图的能力。这些缩略图是由核心和第三方外壳扩展提供的。

Windows explorer has the ability to show thumbnails of files. These thumbnails are provided by core and third-party shell extensions.

我知道如何扩展外壳提供缩略图窗口。

I know how to extend the shell to provide thumbnails to Windows.

我想要做的是从通过使用C＃壳系统上的任何文件检索缩略图。这可能吗？

What I want to do is retrieve the thumbnail image from any file on the system via the shell using C#. Is this possible?

从本质上讲，我正在写一个自定义的文件浏览器，我想显示缩略图，并且不可能解析每个文件在这个星球上，以使自己的缩略图。

Essentially, I'm writing a custom file browser and I want to show thumbnails, and can't possibly parse every file on the planet to make my own thumbnails.

澄清：
许多答案似乎周围的网页缩略图为中心，或缩放图像。但是，这根本不是我要找的。我要的是要问的Windows这些文件类型的缩略图重新presentation：.DOC，.PDF，使用.3dm，.DWG ......和mabye十几以上。我不想来解析，渲染，使自己的缩略图，因为Windows已经知道如何。

Clarification: Many answers seem to be centered around web page thumbnails, or scaling an image. But that's not at all what I'm looking for. What I want is to ask Windows for the thumbnail representation of these file types: .DOC, .PDF, .3DM, .DWG... and mabye about a dozen more. I don't want to parse, render, and make thumbnails myself, because Windows already knows how.

在code我张贴作为一个答案实际工作......也许它可以简化并清理了一下。

The code I posted as an answer actually works... maybe it can be simplified and cleaned up a bit.

推荐答案

今天这个跑过 - 这是一个几个月大，但它得到了我所做的工作（Win7上，对MPEG-4文件中提取缩略图）：

Ran across this today -- it's a few months old, but it got the job done for me (on Win7, extracting thumbnails on MPEG-4 files):

<一个href=\"https://blogs.msdn.microsoft.com/windowssdk/2009/06/12/windows-api-$c$c-pack-for-microsoft-net-framework/\" rel=\"nofollow\">https://blogs.msdn.microsoft.com/windowssdk/2009/06/12/windows-api-$c$c-pack-for-microsoft-net-framework/

ShellFile shellFile = ShellFile.FromFilePath(pathToYourFile);
Bitmap shellThumb = shellFile.Thumbnail.ExtraLargeBitmap;

希望它帮助！

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