是IShellItemImageFactory接口，用于获取Vista / 7 shell缩略图，坏了吗？ [英] Is the IShellItemImageFactory interface, used for getting Vista/7 shell thumbnails, broken?

问题描述

我想使用 IShellItemImageFactory 以检索文件的shell缩略图。根据MSDN文档，如果我传入256x256的SIZE结构，它应该使用256x256位图填充HBITMAP参数，如果我使用SIIGBF_RESIZETOFIT标志，它应该将较小的缩略图调整为256x256。它不。相反，结果是一个256x256的位图，在中间绘制一个小图标。

I want to use IShellItemImageFactory to retrieve the shell thumbnail of files. According to the MSDN docs, if I pass in a SIZE struct of 256x256, it should populate the HBITMAP parameter with a 256x256 bitmap, and if I use the SIIGBF_RESIZETOFIT flag, it should resize smaller thumbnails to 256x256. It doesn't. Instead, the result is a 256x256 bitmap with a small icon drawn in the middle.

好吧，也许这不是什么SIIGBF_RESIZETOFIT应该做的。但是，根据我的理解，我应该能够使用SIIGBF_BIGGERSIZEOK和指定一个小尺寸（说1x1），它应该返回实际的缩略图大小。它不。我总是得到任何我传递的大小。

Okay, maybe that's just not what SIIGBF_RESIZETOFIT is supposed to do. But then, as I understand it, I should be able to use SIIGBF_BIGGERSIZEOK and specify a tiny size (say 1x1) and it should return the actual thumbnail size instead. It doesn't. I always get whatever size I pass in.

我使用这个API不正确，还是只是坏了？网上似乎有很少的例子。有几个讨论帖有人建议API被打破。如果它确实坏了，我如何确定一个给定的壳项目是否有缩略图？

Am I using this API incorrectly, or is it just broken? There seem to be very few examples on the web. A few discussion posts have people suggesting the API is broken. If it is indeed broken, how can I determine if a given shell item has a thumbnail? That way, I can use this method to get thumbnails and extract the icon otherwise.

推荐答案

您见过 http://mattolenik.spaces.live.com/?_c11_BlogPart_BlogPart= blogview& _c = BlogPart& partqs = cat％3D.NET

我试过了，似乎运作良好

I've tried it and it seems to work well

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