QFileInfo ¶

QFileInfo class provides system-independent file information. 更多 …

概要 ¶

函数 ¶

def __eq__ (fileinfo)
def __ne__ (fileinfo)
def __reduce__ ()
def absoluteDir ()
def absoluteFilePath ()
def absolutePath ()
def baseName ()
def birthTime ()
def bundleName ()
def caching ()
def canonicalFilePath ()
def canonicalPath ()
def completeBaseName ()
def completeSuffix ()
def created ()
def dir ()
def exists ()
def fileName ()
def filePath ()
def group ()
def groupId ()
def isAbsolute ()
def isBundle ()
def isDir ()
def isExecutable ()
def isFile ()
def isHidden ()
def isJunction ()
def isNativePath ()
def isReadable ()
def isRelative ()
def isRoot ()
def isShortcut ()
def isSymLink ()
def isSymbolicLink ()
def isWritable ()
def lastModified ()
def lastRead ()
def makeAbsolute ()
def metadataChangeTime ()
def owner ()
def ownerId ()
def path ()
def readLink ()
def refresh ()
def setCaching (on)
def setFile (dir, file)
def setFile (file)
def setFile (file)
def size ()
def suffix ()
def swap (other)
def symLinkTarget ()

静态函数 ¶

def exists (file)

详细描述 ¶

QFileInfo provides information about a file’s name and position (path) in the file system, its access rights and whether it is a directory or symbolic link, etc. The file’s size and last modified/read times are also available. QFileInfo can also be used to obtain information about a Qt resource .

A QFileInfo can point to a file with either a relative or an absolute file path. Absolute file paths begin with the directory separator “/” (or with a drive specification on Windows). Relative file names begin with a directory name or a file name and specify a path relative to the current working directory. An example of an absolute path is the string “/tmp/quartz”. A relative path might look like “src/fatlib”. You can use the function isRelative() to check whether a QFileInfo is using a relative or an absolute file path. You can call the function makeAbsolute() to convert a relative QFileInfo ‘s path to an absolute path.

The file that the QFileInfo works on is set in the constructor or later with setFile() 。使用 exists() to see if the file exists and size() to get its size.

The file’s type is obtained with isFile() , isDir() and isSymLink() 。 symLinkTarget() function provides the name of the file the symlink points to.

On Unix (including macOS and iOS), the property getter functions in this class return the properties such as times and size of the target file, not the symlink, because Unix handles symlinks transparently. Opening a symlink using QFile effectively opens the link’s target. For example:
info1 = QFileInfo("/home/bob/bin/untabify")
info1.isSymLink()           # returns true
info1.absoluteFilePath()    # returns "/home/bob/bin/untabify"
info1.size()                # returns 56201
info1.symLinkTarget()       # returns "/opt/pretty++/bin/untabify"
info2 = QFileInfo(info1.symLinkTarget())
info1.isSymLink()           # returns False
info1.absoluteFilePath()    # returns "/opt/pretty++/bin/untabify"
info1.size()                # returns 56201
											
On Windows, shortcuts ( .lnk files) are currently treated as symlinks. As on Unix systems, the property getters return the size of the targeted file, not the .lnk file itself. This behavior is deprecated and will likely be removed in a future version of Qt, after which .lnk files will be treated as regular files.
info1 = QFileInfo("C:\\Documents and Settings\\Bob\\untabify.lnk")
info1.isSymLink()           # returns True
info1.absoluteFilePath()    # returns "C:/Documents and Settings/Bob/untabify.lnk"
info1.size()                # returns 743
info1.symLinkTarget()       # returns "C:/Pretty++/untabify"
info2 = QFileInfo(info1.symLinkTarget())
info1.isSymLink()           # returns False
info1.absoluteFilePath()    # returns "C:/Pretty++/untabify"
info1.size()                # returns 63942
											
Elements of the file’s name can be extracted with path() and fileName() 。 fileName() ‘s parts can be extracted with baseName() , suffix() or completeSuffix() . QFileInfo objects to directories created by Qt classes will not have a trailing file separator. If you wish to use trailing separators in your own file info objects, just append one to the file name given to the constructors or setFile() .

The file’s dates are returned by birthTime() , lastModified() , lastRead() and fileTime() . Information about the file’s access permissions is obtained with isReadable() , isWritable() and isExecutable() . The file’s ownership is available from owner() , ownerId() , group() and groupId() . You can examine a file’s permissions and ownership in a single statement using the permission() 函数。

注意

On NTFS file systems, ownership and permissions checking is disabled by default for performance reasons. To enable it, include the following line:
extern Q_CORE_EXPORT int qt_ntfs_permission_lookup;
											
Permission checking is then turned on and off by incrementing and decrementing qt_ntfs_permission_lookup by 1.
qt_ntfs_permission_lookup += 1 // turn checking on
qt_ntfs_permission_lookup += 1 // turn it off again
											

性能问题 ¶

Some of QFileInfo ‘s functions query the file system, but for performance reasons, some functions only operate on the file name itself. For example: To return the absolute path of a relative file name, absolutePath() has to query the file system. The path() function, however, can work on the file name directly, and so it is faster.

注意

To speed up performance, QFileInfo caches information about the file.

Because files can be changed by other users or programs, or even by other parts of the same program, there is a function that refreshes the file information: refresh() . If you want to switch off a QFileInfo ‘s caching and force it to access the file system every time you request information from it call setCaching (false).

另请参阅

QDir QFile

class QFileInfo ¶

QFileInfo(dir, file)

QFileInfo(file)

QFileInfo(fileinfo)

QFileInfo(file)

param dir

QDir

param fileinfo

QFileInfo

param file

unicode

构造空 QFileInfo 对象。

Note that an empty QFileInfo object contain no file reference.

另请参阅

setFile()

构造新 QFileInfo that gives information about the given file in the directory dir .

若 dir has a relative path, the QFileInfo will also have a relative path.

若 file is an absolute path, then the directory specified by dir will be disregarded.

另请参阅

isRelative()

PySide2.QtCore.QFileInfo. __reduce__ ( ) ¶

返回类型: PyObject

PySide2.QtCore.QFileInfo. absoluteDir ( ) ¶

返回类型: QDir

Returns the file’s absolute path as a QDir 对象。

另请参阅

dir() filePath() fileName() isRelative()

PySide2.QtCore.QFileInfo. absoluteFilePath ( ) ¶

返回类型: unicode

Returns an absolute path including the file name.

The absolute path name consists of the full path and the file name. On Unix this will always begin with the root, ‘/’, directory. On Windows this will always begin ‘D:/’ where D is a drive letter, except for network shares that are not mapped to a drive letter, in which case the path will begin ‘//sharename/’. QFileInfo will uppercase drive letters. Note that QDir does not do this. The code snippet below shows this.

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

This function returns the same as filePath() , unless isRelative() is true. In contrast to canonicalFilePath() , symbolic links or redundant “.” or “..” elements are not necessarily removed.

警告

若 filePath() is empty the behavior of this function is undefined.

另请参阅

filePath() canonicalFilePath() isRelative()

PySide2.QtCore.QFileInfo. absolutePath ( ) ¶

返回类型: unicode

Returns a file’s path absolute path. This doesn’t include the file name.

On Unix the absolute path will always begin with the root, ‘/’, directory. On Windows this will always begin ‘D:/’ where D is a drive letter, except for network shares that are not mapped to a drive letter, in which case the path will begin ‘//sharename/’.

In contrast to canonicalPath() symbolic links or redundant “.” or “..” elements are not necessarily removed.

警告

若 filePath() is empty the behavior of this function is undefined.

另请参阅

absoluteFilePath() path() canonicalPath() fileName() isRelative()

PySide2.QtCore.QFileInfo. baseName ( ) ¶

返回类型: unicode

Returns the base name of the file without the path.

The base name consists of all characters in the file up to (but not including) the first ‘.’ character.

范例：

												fi = QFileInfo("/tmp/archive.tar.gz")
base = fi.baseName()                    # base = "archive"

The base name of a file is computed equally on all platforms, independent of file naming conventions (e.g., “.bashrc” on Unix has an empty base name, and the suffix is “bashrc”).

另请参阅

fileName() suffix() completeSuffix() completeBaseName()

PySide2.QtCore.QFileInfo. birthTime ( ) ¶

返回类型: QDateTime

Returns the date and time when the file was created / born.

If the file birth time is not available, this function returns an invalid QDateTime .

If the file is a symlink, the time of the target file is returned (not the symlink).

另请参阅

lastModified() lastRead() metadataChangeTime()

PySide2.QtCore.QFileInfo. bundleName ( ) ¶

返回类型: unicode

Returns the name of the bundle.

On macOS and iOS this returns the proper localized name for a bundle if the path isBundle() . On all other platforms an empty QString 被返回。

范例：

												fi = QFileInfo("/Applications/Safari.app")
bundle = fi.bundleName()                # name = "Safari"

另请参阅

isBundle() filePath() baseName() suffix()

PySide2.QtCore.QFileInfo. caching ( ) ¶

返回类型: bool

返回 true if caching is enabled; otherwise returns false .

另请参阅

setCaching() refresh()

PySide2.QtCore.QFileInfo. canonicalFilePath ( ) ¶

返回类型: unicode

Returns the canonical path including the file name, i.e. an absolute path without symbolic links or redundant “.” or “..” elements.

If the file does not exist, returns an empty string.

另请参阅

filePath() absoluteFilePath() dir()

PySide2.QtCore.QFileInfo. canonicalPath ( ) ¶

返回类型: unicode

Returns the file’s path canonical path (excluding the file name), i.e. an absolute path without symbolic links or redundant “.” or “..” elements.

If the file does not exist, returns an empty string.

另请参阅

path() absolutePath()

PySide2.QtCore.QFileInfo. completeBaseName ( ) ¶

返回类型: unicode

Returns the complete base name of the file without the path.

The complete base name consists of all characters in the file up to (but not including) the last ‘.’ character.

范例：

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

另请参阅

fileName() suffix() completeSuffix() baseName()

PySide2.QtCore.QFileInfo. completeSuffix ( ) ¶

返回类型: unicode

Returns the complete suffix (extension) of the file.

The complete suffix consists of all characters in the file after (but not including) the first ‘.’.

范例：

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

另请参阅

fileName() suffix() baseName() completeBaseName()

PySide2.QtCore.QFileInfo. created ( ) ¶

返回类型: QDateTime

注意

此函数被弃用。

Returns the date and time when the file was created, the time its metadata was last changed or the time of last modification, whichever one of the three is available (in that order).

This function is deprecated. Instead, use the birthTime() function to get the time the file was created, metadataChangeTime() to get the time its metadata was last changed, or lastModified() to get the time it was last modified.

If the file is a symlink, the time of the target file is returned (not the symlink).

另请参阅

birthTime() metadataChangeTime() lastModified() lastRead()

PySide2.QtCore.QFileInfo. dir ( ) ¶

返回类型: QDir

Returns the path of the object’s parent directory as a QDir 对象。

注意

QDir returned always corresponds to the object’s parent directory, even if the QFileInfo represents a directory.

For each of the following, returns the QDir "~/examples/191697" .

												QFileInfo fileInfo1("~/examples/191697/.");
QFileInfo fileInfo2("~/examples/191697/..");
QFileInfo fileInfo3("~/examples/191697/main.cpp");
												
											

For each of the following, returns the QDir "." .

												QFileInfo fileInfo4(".");
QFileInfo fileInfo5("..");
QFileInfo fileInfo6("main.cpp");
												
											

另请参阅

absolutePath() filePath() fileName() isRelative() absoluteDir()

PySide2.QtCore.QFileInfo. exists ( ) ¶

返回类型: bool

返回 true 若文件存在；否则返回 false .

注意

若文件是指向不存在文件的符号链接，返回 false。

static PySide2.QtCore.QFileInfo. exists ( file ) ¶

参数: file – unicode
返回类型: bool

返回 true 若 file 存在；否则返回 false .

注意

若 file 是指向不存在文件的符号链接，返回 false。

注意

使用此函数会更快相比使用 QFileInfo(file).exists() 对于文件系统访问。

PySide2.QtCore.QFileInfo. fileName ( ) ¶

返回类型: unicode

返回文件的名称，排除路径。

范例：

												fi = QFileInfo("/tmp/archive.tar.gz")
name = fi.fileName()                    # name = "archive.tar.gz"

注意：若此 QFileInfo 给定以斜杠结尾的路径，认为文件名是空的。

另请参阅

isRelative() filePath() baseName() suffix()

PySide2.QtCore.QFileInfo. filePath ( ) ¶

返回类型: unicode

Returns the file name, including the path (which may be absolute or relative).

另请参阅

absoluteFilePath() canonicalFilePath() isRelative()

PySide2.QtCore.QFileInfo. group ( ) ¶

返回类型: unicode

Returns the group of the file. On Windows, on systems where files do not have groups, or if an error occurs, an empty string is returned.

This function can be time consuming under Unix (in the order of milliseconds).

If the file is a symlink, this function returns the owning group of the target (not the symlink).

另请参阅

groupId() owner() ownerId()

PySide2.QtCore.QFileInfo. groupId ( ) ¶

返回类型: uint

Returns the id of the group the file belongs to.

On Windows and on systems where files do not have groups this function always returns (uint) -2.

If the file is a symlink, this function returns the id of the group owning the target (not the symlink).

另请参阅

group() owner() ownerId()

PySide2.QtCore.QFileInfo. isAbsolute ( ) ¶

返回类型: bool

返回 true if the file path name is absolute, otherwise returns false if the path is relative.

另请参阅

isRelative()

PySide2.QtCore.QFileInfo. isBundle ( ) ¶

返回类型: bool

返回 true if this object points to a bundle or to a symbolic link to a bundle on macOS and iOS; otherwise returns false .

If the file is a symlink, this function returns true if the target is a bundle (not the symlink).

另请参阅

isDir() isSymLink() isFile()

PySide2.QtCore.QFileInfo. isDir ( ) ¶

返回类型: bool

返回 true if this object points to a directory or to a symbolic link to a directory; otherwise returns false .

If the file is a symlink, this function returns true if the target is a directory (not the symlink).

另请参阅

isFile() isSymLink() isBundle()

PySide2.QtCore.QFileInfo. isExecutable ( ) ¶

返回类型: bool

返回 true if the file is executable; otherwise returns false .

If the file is a symlink, this function returns true if the target is executable (not the symlink).

另请参阅

isReadable() isWritable() permission()

PySide2.QtCore.QFileInfo. isFile ( ) ¶

返回类型: bool

返回 true if this object points to a file or to a symbolic link to a file. Returns false if the object points to something which isn’t a file, such as a directory.

If the file is a symlink, this function returns true if the target is a regular file (not the symlink).

另请参阅

isDir() isSymLink() isBundle()

PySide2.QtCore.QFileInfo. isHidden ( ) ¶

返回类型: bool

返回 true if this is a `hidden’ file; otherwise returns false .

注意

此函数返回 true for the special entries “.” and “..” on Unix, even though entryList threats them as shown. And note that, since this function inspects the file name, on Unix it will inspect the name of the symlink, if this file is a symlink, not the target’s name.

On Windows, this function returns true if the target file is hidden (not the symlink).

PySide2.QtCore.QFileInfo. isJunction ( ) ¶

返回类型: bool

返回 true if the object points to a junction; otherwise returns false .

Junctions only exist on Windows’ NTFS file system, and are typically created by the mklink command. They can be thought of as symlinks for directories, and can only be created for absolute paths on the local volume.

PySide2.QtCore.QFileInfo. isNativePath ( ) ¶

返回类型: bool

返回 true if the file path can be used directly with native APIs. Returns false if the file is otherwise supported by a virtual file system inside Qt, such as the Qt Resource System .

注意

Native paths may still require conversion of path separators and character encoding, depending on platform and input requirements of the native API.

另请参阅

toNativeSeparators() encodeName() filePath() absoluteFilePath() canonicalFilePath()

PySide2.QtCore.QFileInfo. isReadable ( ) ¶

返回类型: bool

返回 true if the user can read the file; otherwise returns false .

If the file is a symlink, this function returns true if the target is readable (not the symlink).

注意

若 NTFS permissions check has not been enabled, the result on Windows will merely reflect whether the file exists.

另请参阅

isWritable() isExecutable() permission()

PySide2.QtCore.QFileInfo. isRelative ( ) ¶

返回类型: bool

返回 true if the file path name is relative, otherwise returns false if the path is absolute (e.g. under Unix a path is absolute if it begins with a “/”).

另请参阅

isAbsolute()

PySide2.QtCore.QFileInfo. isRoot ( ) ¶

返回类型: bool

返回 true if the object points to a directory or to a symbolic link to a directory, and that directory is the root directory; otherwise returns false .

PySide2.QtCore.QFileInfo. isShortcut ( ) ¶

返回类型: bool

返回 true if this object points to a shortcut; otherwise returns false .

Shortcuts only exist on Windows and are typically .lnk files. For instance, true will be returned for shortcuts ( *.lnk files) on Windows, but false will be returned on Unix (including macOS and iOS).

The shortcut (.lnk) files are treated as regular files. Opening those will open the .lnk file itself. In order to open the file a shortcut references to, it must uses symLinkTarget() on a shortcut.

注意

Even if a shortcut (broken shortcut) points to a non existing file, returns true.

另请参阅

isFile() isDir() isSymbolicLink() symLinkTarget()

PySide2.QtCore.QFileInfo. isSymLink ( ) ¶

返回类型: bool

返回 true if this object points to a symbolic link or shortcut; otherwise returns false .

Symbolic links exist on Unix (including macOS and iOS) and Windows and are typically created by the ln -s or mklink commands, respectively. Opening a symbolic link effectively opens the link's target .

In addition, true will be returned for shortcuts ( *.lnk files) on Windows. This behavior is deprecated and will likely change in a future version of Qt. Opening those will open the .lnk file itself.

范例：

												info = QFileInfo(fileName)
if info.isSymLink():
    fileName = info.symLinkTarget()
												
											

注意

If the symlink points to a non existing file, exists() returns false.

另请参阅

isFile() isDir() symLinkTarget()

PySide2.QtCore.QFileInfo. isSymbolicLink ( ) ¶

返回类型: bool

返回 true if this object points to a symbolic link; otherwise returns false .

Symbolic links exist on Unix (including macOS and iOS) and Windows (NTFS-symlink) and are typically created by the ln -s or mklink commands, respectively.

Unix handles symlinks transparently. Opening a symbolic link effectively opens the link's target .

In contrast to isSymLink() , false will be returned for shortcuts ( *.lnk files) on Windows. Use isShortcut() 代替。

注意

If the symlink points to a non existing file, exists() returns false.

另请参阅

isFile() isDir() isShortcut() symLinkTarget()

PySide2.QtCore.QFileInfo. isWritable ( ) ¶

返回类型: bool

返回 true if the user can write to the file; otherwise returns false .

If the file is a symlink, this function returns true if the target is writeable (not the symlink).

注意

若 NTFS permissions check has not been enabled, the result on Windows will merely reflect whether the file is marked as Read Only.

另请参阅

isReadable() isExecutable() permission()

PySide2.QtCore.QFileInfo. lastModified ( ) ¶

返回类型: QDateTime

Returns the date and local time when the file was last modified.

If the file is a symlink, the time of the target file is returned (not the symlink).

另请参阅

birthTime() lastRead() metadataChangeTime() fileTime()

PySide2.QtCore.QFileInfo. lastRead ( ) ¶

返回类型: QDateTime

Returns the date and local time when the file was last read (accessed).

On platforms where this information is not available, returns the same as lastModified() .

If the file is a symlink, the time of the target file is returned (not the symlink).

另请参阅

birthTime() lastModified() metadataChangeTime() fileTime()

PySide2.QtCore.QFileInfo. makeAbsolute ( ) ¶

返回类型: bool

Converts the file’s path to an absolute path if it is not already in that form. Returns true to indicate that the path was converted; otherwise returns false to indicate that the path was already absolute.

另请参阅

filePath() isRelative()

PySide2.QtCore.QFileInfo. metadataChangeTime ( ) ¶

返回类型: QDateTime

Returns the date and time when the file metadata was changed. A metadata change occurs when the file is created, but it also occurs whenever the user writes or sets inode information (for example, changing the file permissions).

If the file is a symlink, the time of the target file is returned (not the symlink).

另请参阅

lastModified() lastRead()

PySide2.QtCore.QFileInfo. __ne__ ( fileinfo ) ¶

参数: fileinfo – QFileInfo
返回类型: bool

返回 true 若此 QFileInfo object refers to a different file than the one specified by fileinfo ；否则返回 false .

另请参阅

operator==()

PySide2.QtCore.QFileInfo. __eq__ ( fileinfo ) ¶

参数: fileinfo – QFileInfo
返回类型: bool

返回 true 若此 QFileInfo object refers to a file in the same location as fileinfo ；否则返回 false .

Note that the result of comparing two empty QFileInfo objects, containing no file references (file paths that do not exist or are empty), is undefined.

警告

This will not compare two different symbolic links pointing to the same file.

警告

Long and short file names that refer to the same file on Windows are treated as if they referred to different files.

另请参阅

operator!=()

PySide2.QtCore.QFileInfo. owner ( ) ¶

返回类型: unicode

Returns the owner of the file. On systems where files do not have owners, or if an error occurs, an empty string is returned.

This function can be time consuming under Unix (in the order of milliseconds). On Windows, it will return an empty string unless the NTFS permissions check has been enabled.

If the file is a symlink, this function returns the owner of the target (not the symlink).

另请参阅

ownerId() group() groupId()

PySide2.QtCore.QFileInfo. ownerId ( ) ¶

返回类型: uint

Returns the id of the owner of the file.

On Windows and on systems where files do not have owners this function returns ((uint) -2).

If the file is a symlink, this function returns the id of the owner of the target (not the symlink).

另请参阅

owner() group() groupId()

PySide2.QtCore.QFileInfo. path ( ) ¶

返回类型: unicode

Returns the file’s path. This doesn’t include the file name.

注意：若此 QFileInfo object is given a path ending in a slash, the name of the file is considered empty and this function will return the entire path.

另请参阅

filePath() absolutePath() canonicalPath() dir() fileName() isRelative()

PySide2.QtCore.QFileInfo. readLink ( ) ¶

返回类型: unicode

注意

此函数被弃用。

使用 symLinkTarget() 代替。

PySide2.QtCore.QFileInfo. refresh ( ) ¶: Refreshes the information about the file, i.e. reads in information from the file system the next time a cached property is fetched.

PySide2.QtCore.QFileInfo. setCaching ( on ) ¶

参数: on – bool

若 enable is true, enables caching of file information. If enable is false caching is disabled.

When caching is enabled, QFileInfo reads the file information from the file system the first time it’s needed, but generally not later.

Caching is enabled by default.

另请参阅

refresh() caching()

PySide2.QtCore.QFileInfo. setFile ( dir , file ) ¶

参数

dir – QDir
file – unicode

这是重载函数。

Sets the file that the QFileInfo provides information about to file in directory dir .

若 file includes a relative path, the QFileInfo will also have a relative path.

另请参阅

isRelative()

PySide2.QtCore.QFileInfo. setFile ( file ) ¶

参数: file – QFile

PySide2.QtCore.QFileInfo. setFile ( file ) ¶

参数: file – unicode

PySide2.QtCore.QFileInfo. size ( ) ¶

返回类型: qint64

Returns the file size in bytes. If the file does not exist or cannot be fetched, 0 is returned.

If the file is a symlink, the size of the target file is returned (not the symlink).

另请参阅

exists()

PySide2.QtCore.QFileInfo. suffix ( ) ¶

返回类型: unicode

Returns the suffix (extension) of the file.

The suffix consists of all characters in the file after (but not including) the last ‘.’.

范例：

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

The suffix of a file is computed equally on all platforms, independent of file naming conventions (e.g., “.bashrc” on Unix has an empty base name, and the suffix is “bashrc”).

另请参阅

fileName() completeSuffix() baseName() completeBaseName()

PySide2.QtCore.QFileInfo. swap ( other ) ¶

参数: other – QFileInfo

Swaps this file info with other 。此函数非常快，且从不失败。

PySide2.QtCore.QFileInfo. symLinkTarget ( ) ¶

返回类型: unicode

Returns the absolute path to the file or directory a symbolic link points to, or an empty string if the object isn’t a symbolic link.

This name may not represent an existing file; it is only a string. exists() 返回 true if the symlink points to an existing file.

另请参阅

exists() isSymLink() isDir() isFile()

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