opencv imread（）在Windows上的非ASCII文件名 [英] opencv imread() on Windows for non-ASCII file names

问题描述

我们有一个在Windows上打开（和编写）包含非Ascii字符的文件路径的OpenCV问题。
我看到了问题 OpenCV使用外部字符和imread(openCV ),QString unicodes ，但仍然不明白解决问题的正确方法。

We have an OpenCV problem of opening (and writing) file paths that contain non-Ascii characters on Windows. I saw questions OpenCV imread with foreign characters and imread(openCV),QString unicodes but still didn't understand a proper way of solving the problem.

就像我在OpenCV源代码中看到的，它甚至在Windows上使用fopen（而不是_wfopen），afaik fopen不处理Windows上的非ascii字符。从上面的问题，我看到可能有一些技巧使用QStrings，但如果它的工作原理是什么？如何将unicode字符串转换为Windows？fopen（）接受的字符数组？

As far I as I saw in the OpenCV source code, it uses fopen even on Windows (instead of _wfopen) and afaik fopen does not handle non-ascii characters on Windows. From the questions above I saw that there could be some trick using QStrings, but if it works what does it exactly do? How does it transform a unicode string to a character array that will be accepted by Windows' fopen()?

我们不使用QT

提前感谢！

推荐答案

没有破解OpenCV源代码的方法是使用 _wfopen （如Remy建议）将整个文件读入内存缓冲区。然后使用OpenCV的函数 imdecode 从该缓冲区创建 cv :: Mat 。

The way to do this without hacking the OpenCV source code is to use _wfopen (as Remy suggested) to read the whole file into a memory buffer. Then use OpenCV's function imdecode to create a cv::Mat from that buffer.

如果有必要，请使用 imencode 撰写图像到内存缓冲区，然后使用 _wfopen 打开一个具有UNICODE名称的文件，并将缓冲区写入它（或者，您可以 imwrite 到一个临时文件，然后使用相应的API函数移动/重命名它。）

You can do the reverse too, if necessary - i.e. use imencode to write an image to a memory buffer, then use _wfopen to open a file with a UNICODE name and write the buffer to it (alternatively, you could just imwrite to a temporary file and then move/rename it using the appropriate API function).

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