从QML网址获取路径

Question

FileDialog给出一个QML url变量.theurl.toString()给出类似的东西file:///c:\foo\bar.txt.我怎么得到c:\foo\bar.txt？

我想以跨平台的方式做到这一点,理想情况下不依赖于正则表达式的黑客攻击.QUrl提供了一种path()方法,但我似乎无法从QML访问它.

Answer 1

按照上面 Chris Dolan 的回答，使用 C++ 中的插槽来处理这个问题可能是最好的：

public slots:

void handleFileChosen(const QString &urlString) {
    const QUrl url(urlString);
    if (url.isLocalFile()) {
        setFile(QDir::toNativeSeparators(url.toLocalFile()));
    } else {
        setFile(urlString);
    }
}

Answer 2

As noted in the comments already, there seems to be no way (yet?) to get the path itself without a regex. So this is the only way to go:

Basic solution

FileDialog {
    onAccepted: {
        var path = myFileDialog.fileUrl.toString();
        // remove prefixed "file:///"
        path = path.replace(/^(file:\/{3})/,"");
        // unescape html codes like '%23' for '#'
        cleanPath = decodeURIComponent(path);
        console.log(cleanPath)
    }
}

This regex should be quite robust as it only removes the file:/// from the beginning of the string.

You will also need to unescape some HTML characters (if the file name contains e.g. the hash #, this would be returned as %23. We decode this by using the JavaScript function decodeURIComponent()).

Fully featured example

If you not only want to filter the file:/// but also qrc:// and http://, you can use this RegEx:

^(file:\/{3})|(qrc:\/{2})|(http:\/{2})

So the new, complete code would be:

FileDialog {
    onAccepted: {
        var path = myFileDialog.fileUrl.toString();
        // remove prefixed "file:///"
        path= path.replace(/^(file:\/{3})|(qrc:\/{2})|(http:\/{2})/,"");
        // unescape html codes like '%23' for '#'
        cleanPath = decodeURIComponent(path);
        console.log(cleanPath)
    }
}

This is a good playground for RegEx'es: http://regex101.com/r/zC1nD5/1

Answer 3

在 MS Windows 中，“file:///c:\foo\bar.txt”应转换为“c:\foo\bar.txt”。然而，在 Linux 中，url“file:///Users/data/abcdef”的正确路径为“/Users/data/abcdef”。我创建了一个简单的函数来将 url 转换为路径：

function urlToPath(urlString) {
    var s
    if (urlString.startsWith("file:///")) {
        var k = urlString.charAt(9) === ':' ? 8 : 7
        s = urlString.substring(k)
    } else {
        s = urlString
    }
    return decodeURIComponent(s);
}