如何检查由带德语变音符号的 QString 表示的路径是否存在？

发布于 2024-08-28 08:17:59 字数 566 浏览 2 评论 0原文

我得到一个 QString，它代表来自 QLineEdit 的目录。现在我想检查该目录中是否存在某个文件。但是，如果我尝试使用 os.path.exists 和 os.path.join 并在目录路径中出现德语变音符号时遇到麻烦：

#the direcory coming from the user input in the QLineEdit
#i take this QString to the local 8-Bit encoding and then make
#a string from it
target_dir = str(lineEdit.text().toLocal8Bit())
#the file name that should be checked for
file_name = 'some-name.txt'
#this fails with a UnicodeDecodeError when a umlaut occurs in target_dir
os.path.exists(os.path.join(target_dir, file_name))

当您可能遇到德语变音符号时，您将如何检查文件是否存在？

原文

i get a QString which represents a directory from a QLineEdit. Now i want to check wether a certain file exists in this directory. But if i try this with os.path.exists and os.path.join and get in trouble when german umlauts occur in the directory path:

#the direcory coming from the user input in the QLineEdit
#i take this QString to the local 8-Bit encoding and then make
#a string from it
target_dir = str(lineEdit.text().toLocal8Bit())
#the file name that should be checked for
file_name = 'some-name.txt'
#this fails with a UnicodeDecodeError when a umlaut occurs in target_dir
os.path.exists(os.path.join(target_dir, file_name))

How would you check if the file exists, when you might encounter german umlauts?

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離殇 2024-09-04 08:17:59

在我的带有 ext3 文件系统的 Ubuntu 机器上，我没有得到任何结果。所以，我想首先确保文件系统支持 unicode 文件名，否则我认为该行为是未定义的？

>>> os.path.supports_unicode_filenames
True

如果这是真的，您应该能够直接将 unicode 字符串传递给 os.path 调用：

>>> print u'\xf6'
ö
>>> target_dir = os.path.join(os.getcwd(), u'\xf6')
>>> print target_dir
C:\Python26\ö
>>> os.path.exists(os.path.join(target_dir, 'test.txt'))
True

您应该查看 QString.toUtf8 并可能在将返回值传递给 os.path.join 之前将其传递给 os.path.normpath

祝你好运！

nm，它在我的 ubuntu 盒子上也运行得很好......

>>> os.path.supports_unicode_filenames
False
>>> target_dir = os.path.join(os.getcwd(), u'\xf6')
>>> print target_dir
/home/clayg/ö
>>> os.path.exists(os.path.join(target_dir, 'test'))
True

I was getting no where with this on my Ubuntu box with an ext3 filesystem. So, I guess make sure the filesystem supports unicode filenames first, or else I believe the behavior is undefined?

>>> os.path.supports_unicode_filenames
True

If that's True, you should be able to pass unicode strings to the os.path calls directly:

>>> print u'\xf6'
ö
>>> target_dir = os.path.join(os.getcwd(), u'\xf6')
>>> print target_dir
C:\Python26\ö
>>> os.path.exists(os.path.join(target_dir, 'test.txt'))
True

You should look at QString.toUtf8 and maybe pass the returned value through os.path.normpath before handing it over to os.path.join

Good Luck!

nm, it works fine on my ubuntu box as well...

>>> os.path.supports_unicode_filenames
False
>>> target_dir = os.path.join(os.getcwd(), u'\xf6')
>>> print target_dir
/home/clayg/ö
>>> os.path.exists(os.path.join(target_dir, 'test'))
True

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