QStandardPaths ¶

概要 ¶

详细描述 ¶

This class contains functions to query standard locations on the local filesystem, for common tasks such as user-specific directories or system-wide configuration directories.

PySide2.QtCore.QStandardPaths. StandardLocation ¶

This enum describes the different locations that can be queried using methods such as writableLocation , standardLocations ，和 displayName .

Some of the values in this enum represent a user configuration. Such enum values will return the same paths in different applications, so they could be used to share data with other applications. Other values are specific to this application. Each enum value in the table below describes whether it’s application-specific or generic.

Application-specific directories should be assumed to be unreachable by other applications. Therefore, files placed there might not be readable by other applications, even if run by the same user. On the other hand, generic directories should be assumed to be accessible by all applications run by this user, but should still be assumed to be unreachable by applications by other users.

Data interchange with other users is out of the scope of QStandardPaths .

常量	描述
QStandardPaths.DesktopLocation	Returns the user’s desktop directory. This is a generic value. On systems with no concept of a desktop, this is the same as .
QStandardPaths.DocumentsLocation	Returns the directory containing user document files. This is a generic value. The returned path is never empty.
QStandardPaths.FontsLocation	Returns the directory containing user’s fonts. This is a generic value. Note that installing fonts may require additional, platform-specific operations.
QStandardPaths.ApplicationsLocation	Returns the directory containing the user applications (either executables, application bundles, or shortcuts to them). This is a generic value. Note that installing applications may require additional, platform-specific operations. Files, folders or shortcuts in this directory are platform-specific.
QStandardPaths.MusicLocation	Returns the directory containing the user’s music or other audio files. This is a generic value. If no directory specific for music files exists, a sensible fallback for storing user documents is returned.
QStandardPaths.MoviesLocation	Returns the directory containing the user’s movies and videos. This is a generic value. If no directory specific for movie files exists, a sensible fallback for storing user documents is returned.
QStandardPaths.PicturesLocation	Returns the directory containing the user’s pictures or photos. This is a generic value. If no directory specific for picture files exists, a sensible fallback for storing user documents is returned.
QStandardPaths.TempLocation	Returns a directory where temporary files can be stored. The returned value might be application-specific, shared among other applications for this user, or even system-wide. The returned path is never empty.
QStandardPaths.HomeLocation	Returns the user’s home directory (the same as homePath() ). On Unix systems, this is equal to the HOME environment variable. This value might be generic or application-specific, but the returned path is never empty.
QStandardPaths.DataLocation	Returns the same value as . This enumeration value is deprecated. Using is preferable since on Windows, the roaming path is recommended.
QStandardPaths.CacheLocation	Returns a directory location where user-specific non-essential (cached) data should be written. This is an application-specific directory. The returned path is never empty.
QStandardPaths.GenericCacheLocation	Returns a directory location where user-specific non-essential (cached) data, shared across applications, should be written. This is a generic value. Note that the returned path may be empty if the system has no concept of shared cache.
QStandardPaths.GenericDataLocation	Returns a directory location where persistent data shared across applications can be stored. This is a generic value. The returned path is never empty.
QStandardPaths.RuntimeLocation	Returns a directory location where runtime communication files should be written, like Unix local sockets. This is a generic value. The returned path may be empty on some systems.
QStandardPaths.ConfigLocation	Returns a directory location where user-specific configuration files should be written. This may be either a generic value or application-specific, and the returned path is never empty.
QStandardPaths.DownloadLocation	Returns a directory for user’s downloaded files. This is a generic value. If no directory specific for downloads exists, a sensible fallback for storing user documents is returned.
QStandardPaths.GenericConfigLocation	Returns a directory location where user-specific configuration files shared between multiple applications should be written. This is a generic value and the returned path is never empty.
QStandardPaths.AppDataLocation	Returns a directory location where persistent application data can be stored. This is an application-specific directory. To obtain a path to store data to be shared with other applications, use . The returned path is never empty. On the Windows operating system, this returns the roaming path. This enum value was added in Qt 5.4.
QStandardPaths.AppLocalDataLocation	Returns the local settings path on the Windows operating system. On all other platforms, it returns the same value as . This enum value was added in Qt 5.4.
QStandardPaths.AppConfigLocation	Returns a directory location where user-specific configuration files should be written. This is an application-specific directory, and the returned path is never empty. This enum value was added in Qt 5.5.

The following table gives examples of paths on different operating systems. The first path is the writable path (unless noted). Other, additional paths, if any, represent non-writable locations.

路径类型	macOS	Windows
	“~/Desktop”	“C:/Users/<USER>/Desktop”
	“~/Documents”	“C:/Users/<USER>/Documents”
	“/System/Library/Fonts” (not writable)	“C:/Windows/Fonts” (not writable)
	“/Applications” (not writable)	“C:/Users/<USER>/AppData/Roaming/Microsoft/Windows/Start Menu/Programs”
	“~/Music”	“C:/Users/<USER>/Music”
	“~/Movies”	“C:/Users/<USER>/Videos”
	“~/Pictures”	“C:/Users/<USER>/Pictures”
	randomly generated by the OS	“C:/Users/<USER>/AppData/Local/Temp”
	“~”	“C:/Users/<USER>”
	“~/Library/Application Support/<APPNAME>”, “/Library/Application Support/<APPNAME>”. “<APPDIR>/../Resources”	“C:/Users/<USER>/AppData/Local/<APPNAME>”, “C:/ProgramData/<APPNAME>”, “<APPDIR>”, “<APPDIR>/data”, “<APPDIR>/data/<APPNAME>”
	“~/Library/Caches/<APPNAME>”, “/Library/Caches/<APPNAME>”	“C:/Users/<USER>/AppData/Local/<APPNAME>/cache”
	“~/Library/Application Support”, “/Library/Application Support”	“C:/Users/<USER>/AppData/Local”, “C:/ProgramData”, “<APPDIR>”, “<APPDIR>/data”
	“~/Library/Application Support”	“C:/Users/<USER>”
	“~/Library/Preferences”	“C:/Users/<USER>/AppData/Local/<APPNAME>”, “C:/ProgramData/<APPNAME>”
	“~/Library/Preferences”	“C:/Users/<USER>/AppData/Local”, “C:/ProgramData”
	“~/Downloads”	“C:/Users/<USER>/Documents”
	“~/Library/Caches”, “/Library/Caches”	“C:/Users/<USER>/AppData/Local/cache”
	“~/Library/Application Support/<APPNAME>”, “/Library/Application Support/<APPNAME>”. “<APPDIR>/../Resources”	“C:/Users/<USER>/AppData/Roaming/<APPNAME>”, “C:/ProgramData/<APPNAME>”, “<APPDIR>”, “<APPDIR>/data”, “<APPDIR>/data/<APPNAME>”
	“~/Library/Application Support/<APPNAME>”, “/Library/Application Support/<APPNAME>”. “<APPDIR>/../Resources”	“C:/Users/<USER>/AppData/Local/<APPNAME>”, “C:/ProgramData/<APPNAME>”, “<APPDIR>”, “<APPDIR>/data”, “<APPDIR>/data/<APPNAME>”
	“~/Library/Preferences/<APPNAME>”	“C:/Users/<USER>/AppData/Local/<APPNAME>”, “C:/ProgramData/<APPNAME>”

路径类型	Linux
	“~/Desktop”
	“~/Documents”
	“~/.fonts”, “~/.local/share/fonts”, “/usr/local/share/fonts”, “/usr/share/fonts”
	“~/.local/share/applications”, “/usr/local/share/applications”, “/usr/share/applications”
	“~/Music”
	“~/Videos”
	“~/Pictures”
	“/tmp”
	“~”
	“~/.local/share/<APPNAME>”, “/usr/local/share/<APPNAME>”, “/usr/share/<APPNAME>”
	“~/.cache/<APPNAME>”
	“~/.local/share”, “/usr/local/share”, “/usr/share”
	“/run/user/<USER>”
	“~/.config”, “/etc/xdg”
	“~/.config”, “/etc/xdg”
	“~/Downloads”
	“~/.cache”
	“~/.local/share/<APPNAME>”, “/usr/local/share/<APPNAME>”, “/usr/share/<APPNAME>”
	“~/.local/share/<APPNAME>”, “/usr/local/share/<APPNAME>”, “/usr/share/<APPNAME>”
	“~/.config/<APPNAME>”, “/etc/xdg/<APPNAME>”

路径类型	Android	iOS
	“<APPROOT>/files”	“<APPROOT>/Documents/Desktop”
	“<USER>/Documents”, “<USER>/<APPNAME>/Documents”	“<APPROOT>/Documents”
	“/system/fonts” (not writable)	“<APPROOT>/Library/Fonts”
	not supported (directory not readable)	not supported
	“<USER>/Music”, “<USER>/<APPNAME>/Music”	“<APPROOT>/Documents/Music”
	“<USER>/Movies”, “<USER>/<APPNAME>/Movies”	“<APPROOT>/Documents/Movies”
	“<USER>/Pictures”, “<USER>/<APPNAME>/Pictures”	“<APPROOT>/Documents/Pictures”, “assets-library://”
	“<APPROOT>/cache”	“<APPROOT>/tmp”
	“<APPROOT>/files”	system defined
	“<APPROOT>/files”, “<USER>/<APPNAME>/files”	“<APPROOT>/Library/Application Support”
	“<APPROOT>/cache”, “<USER>/<APPNAME>/cache”	“<APPROOT>/Library/Caches”
	“<USER>”	“<APPROOT>/Documents”
	“<APPROOT>/cache”	not supported
	“<APPROOT>/files/settings”	“<APPROOT>/Library/Preferences”
	“<APPROOT>/files/settings” (there is no shared settings)	“<APPROOT>/Library/Preferences”
	“<USER>/Downloads”, “<USER>/<APPNAME>/Downloads”	“<APPROOT>/Documents/Downloads”
	“<APPROOT>/cache” (there is no shared cache)	“<APPROOT>/Library/Caches”
	“<APPROOT>/files”, “<USER>/<APPNAME>/files”	“<APPROOT>/Library/Application Support”
	“<APPROOT>/files/settings”	“<APPROOT>/Library/Preferences/<APPNAME>”
	“<APPROOT>/files”, “<USER>/<APPNAME>/files”	“<APPROOT>/Library/Application Support”

In the table above, <APPNAME> is usually the organization name, the application name, or both, or a unique name generated at packaging. Similarly, <APPROOT> is the location where this application is installed (often a sandbox). <APPDIR> is the directory containing the application executable.

The paths above should not be relied upon, as they may change according to OS configuration, locale, or they may change in future Qt versions.

注意

On Android, applications with open files on the external storage (<USER> locations), will be killed if the external storage is unmounted.

注意

On Android 6.0 (API 23) or higher, the “WRITE_EXTERNAL_STORAGE” permission must be requested at runtime when using writableLocation or standardLocations .

注意

On iOS, if you do pass QStandardPaths::standardLocations(QStandardPaths::PicturesLocation).last() as argument to setDirectory() , a native image picker dialog will be used for accessing the user’s photo album. The filename returned can be loaded using QFile and related APIs. This feature was added in Qt 5.5.

另请参阅

writableLocation() standardLocations() displayName() locate() locateAll()

PySide2.QtCore.QStandardPaths. LocateOption ¶

This enum describes the different flags that can be used for controlling the behavior of locate and locateAll .

常量	描述
QStandardPaths.LocateFile	只返回文件
QStandardPaths.LocateDirectory	只返回目录

static PySide2.QtCore.QStandardPaths. displayName ( type ) ¶

参数

type – StandardLocation

返回类型

unicode

Returns a localized display name for the given location type or an empty QString if no relevant location can be found.

static PySide2.QtCore.QStandardPaths. enableTestMode ( testMode ) ¶

参数

testMode – bool

注意

此函数被弃用。

使用 setTestModeEnabled

static PySide2.QtCore.QStandardPaths. findExecutable ( executableName [ , paths=list() ] ) ¶

参数

• executableName – unicode

• paths – 字符串列表

返回类型

unicode

Finds the executable named executableName 以指定 paths , or the system paths if paths is empty.

On most operating systems the system path is determined by the PATH environment variable. The directories where to search for the executable can be set in the paths argument. To search in both your own paths and the system paths, call twice, once with paths set and once with paths empty. Symlinks are not resolved in order to preserve behavior for the case of executables whose behavior depends on the name they are invoked with .

注意

On Windows, the usual executable extensions (from the PATHEXT environment variable) are automatically appended. For example, the (“foo”) call finds foo.exe or foo.bat if present.

Returns the absolute file path to the executable, or an empty string if not found.

static PySide2.QtCore.QStandardPaths. isTestModeEnabled ( ) ¶

返回类型

bool

static PySide2.QtCore.QStandardPaths. locate ( type , fileName [ , options=QStandardPaths.LocateFile ] ) ¶

参数

• type – StandardLocation

• fileName – unicode

• options – LocateOptions

返回类型

unicode

Finds a file or directory called fileName in the standard locations for type .

options flag lets you specify whether to look for files or directories. By default, this flag is set to LocateFile .

Returns the absolute path to the first file or directory found, otherwise returns an empty string.

static PySide2.QtCore.QStandardPaths. locateAll ( type , fileName [ , options=QStandardPaths.LocateFile ] ) ¶

参数

• type – StandardLocation

• fileName – unicode

• options – LocateOptions

返回类型

字符串列表

Finds all files or directories by the name, fileName , in the standard locations for type .

options flag lets you specify whether to look for files or directories. By default, this flag is set to LocateFile .

Returns the list of all the files that were found.

static PySide2.QtCore.QStandardPaths. setTestModeEnabled ( testMode ) ¶

参数

testMode – bool

若 testMode is true , this enables a special “test mode” in QStandardPaths , which changes writable locations to point to test directories. This prevents auto tests from reading or writing to the current user’s configuration.

It affects the locations into which test programs might write files: GenericDataLocation , DataLocation , ConfigLocation , GenericConfigLocation , AppConfigLocation , GenericCacheLocation ，和 CacheLocation . Other locations are not affected.

On Unix, XDG_DATA_HOME is set to ~/.qttest/share , XDG_CONFIG_HOME is set to ~/.qttest/config ，和 XDG_CACHE_HOME is set to ~/.qttest/cache .

On macOS, data goes to ~/.qttest/Application 支持 , cache goes to ~/.qttest/Cache , and config goes to ~/.qttest/Preferences .

On Windows, everything goes to a “qttest” directory under %APPDATA% .

static PySide2.QtCore.QStandardPaths. standardLocations ( type ) ¶

参数

type – StandardLocation

返回类型

字符串列表

Returns all the directories where files of type belong.

The list of directories is sorted from high to low priority, starting with writableLocation() if it can be determined. This list is empty if no locations for type are defined.

另请参阅

writableLocation()

static PySide2.QtCore.QStandardPaths. writableLocation ( type ) ¶

参数

type – StandardLocation

返回类型

unicode

Returns the directory where files of type should be written to, or an empty string if the location cannot be determined.

注意

The storage location returned may not exist; that is, it may need to be created by the system or the user.