Summarize the acquisition of commonly used file information QFileInfo in Qt: suffix, name, path, link

Because I have been manipulating the relevant properties of files recently, I took a look at QFileInfo and found that many functions are usually forgotten, such as basename(), suffix(), which are very common, but sometimes I don't remember them.It is also possible to use QString's split to manipulate strings, but it is not so convenient, so summarize and record them.

1. Get the suffix of the file name:

 QFileInfo fi("/tmp/archive.tar.gz");QString ext = fi.suffix(); // ext = "gz"

2. Get all suffixes after the file name symbol point:

 QFileInfo fi("/tmp/archive.tar.gz");QString ext = fi.completeSuffix(); // ext = "tar.gz"

3. Get the absolute path of the file name (the drive letter will be capitalized automatically under Windows):

 QFileInfo fi("c:/temp/foo"); => fi.absoluteFilePath() => "C:/temp/foo"

4. Get all strings of the file name except the suffix of the last symbol point:

QFileInfo fi("/tmp/archive.tar.gz");QString base = fi.completeBaseName(); // base = "archive.tar"