问题描述
有没有人知道如何在 Win32 下的 Emacs 23 中显示 PNG 图像?我已经安装了 gnuwin32 实用程序集，包括 libpng 和 zlib；C:Program FilesGnuWin32in 在路径中.JPG 文件开始工作，但 PNG 不工作.如果您有任何提示，我将不胜感激.
Would anyone have any pointers on getting PNG images to display in Emacs 23 under Win32?.. I have installed the gnuwin32 set of utilities, including libpng and zlib; C:Program FilesGnuWin32in is in path. JPG files started working but not PNGs. I'd appreciate any hints on getting this to work.
PNG 缩略图实际上显示良好(例如通过 C-t C-t 显示).但是，打开它们会失败(在基本模式下作为垃圾打开，并且 M-x 图像模式显示图像规范无效").
PNG thumbnails actually display fine (e.g. in dired via C-t C-t). However, opening them fails (opens as garbage in fundamental mode, and M-x image-mode says "invalid image specification").
推荐答案
您必须复制以下 dll 之一 "libpng12d.dll" "libpng12.dll" "libpng.dll" "libpng13d.dll" "libpng13.dll"到您的 emacs-23.1/bin/目录.它们需要 zlib1.dll，您也必须复制它.我对 jpeg62.dll 和 giflib4.dll 做了同样的事情，现在我的 emacs 支持 jpg、gif 和 png 文件.出于某种原因，如果我只是将这些 dll 放在路径中，则它不起作用.
You have to copy one of these dlls "libpng12d.dll" "libpng12.dll" "libpng.dll" "libpng13d.dll" "libpng13.dll" to your emacs-23.1/bin/ directory. They require zlib1.dll which you have to copy as well. I did the same thing for jpeg62.dll and giflib4.dll and now my emacs supports jpg, gif and png files. For some reason it does not work if I simply put these dlls in the path.
您可以检查 (image-type-available-p 'png) 以查看是否支持 png.image-library-alist 将图像类型映射到支持它的 dll 列表.
You can check (image-type-available-p 'png) to see if png is supported. image-library-alist maps image type to a list of dlls which support it.
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