qt当前工程相对路径,从Qt中的文件获取相对路径-优快云博客

博客围绕在Qt中获取文件相对路径展开。作者尝试将D盘images文件夹下的文件路径以相对路径形式写入D盘confs文件夹下的配置文件，使用QDir和QFileInfo类遇到问题。文中给出解决方案，使用QDir的relativeFilePath方法，但也指出此做法可能使配置和图像路径耦合。

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I am trying to get the relative path from files that I would like to write. Here a situation:

I save a conf file in D:\confs\conf.txt. I have in my programs some files read from D:\images\image.bmp. In my conf.txt I would like to have ../images/image.bmp.

I see some useful classes like QDir or QFileInfo but I don't know what it's the best to use. I tried:

QDir dir("D:/confs");

dir.filePath(D:/images/image.bmp) // Just return the absolute path of image.bmp

I read the doc and it says filePath only work with files in the dir set (here D:\confs) but I wonder if there is a way to indicate to search from a different dir and get his relative path.

解决方案

You are looking for the following method:

QDir dir("/home/bob");

QString s;

s = dir.relativeFilePath("images/file.jpg"); // s is "images/file.jpg"

s = dir.relativeFilePath("/home/mary/file.txt"); // s is "../mary/file.txt"

Adapting your code according to the examples above, it will look as follows:

QDir dir("D:/confs");

dir.relativeFilePath("D:/images/image.bmp") // Just return the absolute path of image.bmp

// ^ ^

Overall, what you do might be a bad idea since it will couple the config and image paths together. I.e. if you move either of them, the application stops working.

Please also notice the missing quotes.