QStandardPaths 类提供用于访问标准路径的方法。 更多...
| 头： | #include <QStandardPaths> |
| CMake: |
find_package(Qt6 REQUIRED COMPONENTS Core)
target_link_libraries(mytarget PRIVATE Qt6::Core) |
| qmake: | QT += core |
| enum | LocateOption { LocateFile, LocateDirectory } |
| flags | LocateOptions |
| enum | StandardLocation { DesktopLocation, DocumentsLocation, FontsLocation, ApplicationsLocation, MusicLocation, …, GenericStateLocation } |
| QString | displayName (QStandardPaths::StandardLocation type ) |
| QString | findExecutable (const QString & executableName , const QStringList & paths = QStringList()) |
| QString | locate (QStandardPaths::StandardLocation type , const QString & fileName , QStandardPaths::LocateOptions options = LocateFile) |
| QStringList | locateAll (QStandardPaths::StandardLocation type , const QString & fileName , QStandardPaths::LocateOptions options = LocateFile) |
| void | setTestModeEnabled (bool testMode ) |
| QStringList | standardLocations (QStandardPaths::StandardLocation type ) |
| QString | writableLocation (QStandardPaths::StandardLocation type ) |
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.
This enum describes the different flags that can be used for controlling the behavior of QStandardPaths::locate and QStandardPaths::locateAll .
| 常量 | 值 | 描述 |
|---|---|---|
QStandardPaths::LocateFile
|
0x0
|
只返回文件 |
QStandardPaths::LocateDirectory
|
0x1
|
只返回目录 |
The LocateOptions type is a typedef for QFlags <LocateOption>. It stores an OR combination of LocateOption values.
This enum describes the different locations that can be queried using methods such as QStandardPaths::writableLocation , QStandardPaths::standardLocations ，和 QStandardPaths::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 | 值 | 描述 |
|---|---|---|
QStandardPaths::DesktopLocation
|
0
|
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::HomeLocation. |
QStandardPaths::DocumentsLocation
|
1
|
Returns the directory containing user document files. This is a generic value. The returned path is never empty. |
QStandardPaths::FontsLocation
|
2
|
Returns the directory containing user's fonts. This is a generic value. Note that installing fonts may require additional, platform-specific operations. |
QStandardPaths::ApplicationsLocation
|
3
|
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
|
4
|
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
|
5
|
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
|
6
|
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
|
7
|
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
|
8
|
Returns the user's home directory (the same as QDir::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::AppLocalDataLocation
|
9
|
Returns the local settings path on the Windows operating system. On all other platforms, it returns the same value as AppDataLocation. This enum value was added in Qt 5.4. |
QStandardPaths::CacheLocation
|
10
|
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
|
15
|
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
|
11
|
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
|
12
|
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
|
13
|
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
|
14
|
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
|
16
|
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
|
17
|
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 QStandardPaths::GenericDataLocation. 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::AppConfigLocation
|
18
|
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. |
QStandardPaths::PublicShareLocation
|
19
|
Returns a directory location where user-specific publicly shared files and directories can be stored. This is a generic value. Note that the returned path may be empty if the system has no concept of a publicly shared location. This enum value was added in Qt 6.4. |
QStandardPaths::TemplatesLocation
|
20
|
Returns a directory location where user-specific template files can be stored. This is a generic value. Note that the returned path may be empty if the system has no concept of a templates location. This enum value was added in Qt 6.4. |
QStandardPaths::StateLocation (since Qt 6.7)
|
21
|
Returns a directory location where user-specific application state data files should be written. This is an application-specific directory, and the returned path is never empty. |
QStandardPaths::GenericStateLocation (since Qt 6.7)
|
22
|
Returns a directory location where shared state data files across applications should be written. This value might be generic or application-specific, but the returned path is never empty. |
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 |
|---|---|---|
| DesktopLocation | "~/Desktop" | "C:/Users/<USER>/Desktop" |
| DocumentsLocation | "~/Documents" | "C:/Users/<USER>/Documents" |
| FontsLocation | "/System/Library/Fonts" (not writable) | "C:/Windows/Fonts" (not writable) |
| ApplicationsLocation | "/Applications" (not writable) | "C:/Users/<USER>/AppData/Roaming/Microsoft/Windows/Start Menu/Programs" |
| MusicLocation | "~/Music" | "C:/Users/<USER>/Music" |
| MoviesLocation | "~/Movies" | "C:/Users/<USER>/Videos" |
| PicturesLocation | "~/Pictures" | "C:/Users/<USER>/Pictures" |
| TempLocation | randomly generated by the OS | "C:/Users/<USER>/AppData/Local/Temp" |
| HomeLocation | "~" | "C:/Users/<USER>" |
| AppLocalDataLocation | "~/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>" |
| CacheLocation | "~/Library/Caches/<APPNAME>", "/Library/Caches/<APPNAME>" | "C:/Users/<USER>/AppData/Local/<APPNAME>/cache" |
| StateLocation | "~/Library/Preferences/<APPNAME>/State" | "C:/Users/<USER>/AppData/Local/<APPNAME>/State", "C:/ProgramData/<APPNAME>/State" |
| GenericDataLocation | "~/Library/Application Support", "/Library/Application Support" | "C:/Users/<USER>/AppData/Local", "C:/ProgramData", "<APPDIR>", "<APPDIR>/data" |
| RuntimeLocation | "~/Library/Application Support" | "C:/Users/<USER>" |
| ConfigLocation | "~/Library/Preferences" | "C:/Users/<USER>/AppData/Local/<APPNAME>", "C:/ProgramData/<APPNAME>" |
| GenericConfigLocation | "~/Library/Preferences" | "C:/Users/<USER>/AppData/Local", "C:/ProgramData" |
| DownloadLocation | "~/Downloads" | "C:/Users/<USER>/Downloads" |
| GenericCacheLocation | "~/Library/Caches", "/Library/Caches" | "C:/Users/<USER>/AppData/Local/cache" |
| GenericStateLocation | "~/Library/Preferences/State" | "C:/Users/<USER>/AppData/Local/State", "C:/ProgramData/State" |
| AppDataLocation | "~/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>" |
| AppConfigLocation | "~/Library/Preferences/<APPNAME>" | "C:/Users/<USER>/AppData/Local/<APPNAME>", "C:/ProgramData/<APPNAME>" |
| PublicShareLocation | "~/Public" | "C:/Users/Public" |
| TemplatesLocation | "~/Templates" | "C:/Users/<USER>/AppData/Roaming/Microsoft/Windows/Templates" |
| 路径类型 | Linux and other UNIX operating systems |
|---|---|
| DesktopLocation | "~/Desktop" |
| DocumentsLocation | "~/Documents" |
| FontsLocation | "~/.fonts", "~/.local/share/fonts", "/usr/local/share/fonts", "/usr/share/fonts" |
| ApplicationsLocation | "~/.local/share/applications", "/usr/local/share/applications", "/usr/share/applications" |
| MusicLocation | "~/Music" |
| MoviesLocation | "~/Videos" |
| PicturesLocation | "~/Pictures" |
| TempLocation | "/tmp" |
| HomeLocation | "~" |
| AppLocalDataLocation | "~/.local/share/<APPNAME>", "/usr/local/share/<APPNAME>", "/usr/share/<APPNAME>" |
| CacheLocation | "~/.cache/<APPNAME>" |
| StateLocation | "~/.local/state/<APPNAME>" |
| GenericDataLocation | "~/.local/share", "/usr/local/share", "/usr/share" |
| RuntimeLocation | "/run/user/<USER>" |
| ConfigLocation | "~/.config", "/etc/xdg" |
| GenericConfigLocation | "~/.config", "/etc/xdg" |
| DownloadLocation | "~/Downloads" |
| GenericCacheLocation | "~/.cache" |
| GenericStateLocation | "~/.local/state" |
| AppDataLocation | "~/.local/share/<APPNAME>", "/usr/local/share/<APPNAME>", "/usr/share/<APPNAME>" |
| AppConfigLocation | "~/.config/<APPNAME>", "/etc/xdg/<APPNAME>" |
| PublicShareLocation | "~/Public" |
| TemplatesLocation | "~/Templates" |
| 路径类型 | Android | iOS |
|---|---|---|
| DesktopLocation | "<APPROOT>/files" | "<APPROOT>/Documents/Desktop" |
| DocumentsLocation | "<USER>/Documents" [*], "<USER>/<APPNAME>/Documents" | "<APPROOT>/Documents" |
| FontsLocation | "/system/fonts" (not writable) | "<APPROOT>/Library/Fonts" |
| ApplicationsLocation | not supported (directory not readable) | 不支持 |
| MusicLocation | "<USER>/Music" [*], "<USER>/<APPNAME>/Music" | "<APPROOT>/Documents/Music" |
| MoviesLocation | "<USER>/Movies" [*], "<USER>/<APPNAME>/Movies" | "<APPROOT>/Documents/Movies" |
| PicturesLocation | "<USER>/Pictures" [*], "<USER>/<APPNAME>/Pictures" | "<APPROOT>/Documents/Pictures", "assets-library://" |
| TempLocation | "<APPROOT>/cache" | "<APPROOT>/tmp" |
| HomeLocation | "<APPROOT>/files" | system defined |
| AppLocalDataLocation | "<APPROOT>/files", "<USER>/<APPNAME>/files" | "<APPROOT>/Library/Application Support" |
| CacheLocation | "<APPROOT>/cache", "<USER>/<APPNAME>/cache" | "<APPROOT>/Library/Caches" |
| StateLocation | "<APPROOT>/files/state" | |
| GenericStateLocation (there is shared state) | "<APPROOT>/files/state" | |
| GenericDataLocation | "<USER>" [*] or "<USER>/<APPNAME>/files" | "<APPROOT>/Library/Application Support" |
| RuntimeLocation | "<APPROOT>/cache" | 不支持 |
| ConfigLocation | "<APPROOT>/files/settings" | "<APPROOT>/Library/Preferences" |
| GenericConfigLocation | "<APPROOT>/files/settings" (there is no shared settings) | "<APPROOT>/Library/Preferences" |
| DownloadLocation | "<USER>/Downloads" [*], "<USER>/<APPNAME>/Downloads" | "<APPROOT>/Documents/Downloads" |
| GenericCacheLocation | "<APPROOT>/cache" (there is no shared cache) | "<APPROOT>/Library/Caches" |
| AppDataLocation | "<APPROOT>/files", "<USER>/<APPNAME>/files" | "<APPROOT>/Library/Application Support" |
| AppConfigLocation | "<APPROOT>/files/settings" | "<APPROOT>/Library/Preferences/<APPNAME>" |
| PublicShareLocation | 不支持 | 不支持 |
| TemplatesLocation | 不支持 | 不支持 |
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 QStandardPaths::writableLocation or QStandardPaths::standardLocations .
注意： On Android, reading/writing to GenericDataLocation needs the READ_EXTERNAL_STORAGE/WRITE_EXTERNAL_STORAGE permission granted.
注意：
[*] On Android 11 and above, public directories are no longer directly accessible in scoped storage mode. Thus, paths of the form
"<USER>/DirName"
are not returned. Instead, you can use
QFileDialog
which uses the Storage Access Framework (SAF) to access such directories.
注意：
On iOS, if you do pass
QStandardPaths::standardLocations(QStandardPaths::PicturesLocation).last()
as argument to
QFileDialog::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 ()，和 locateAll ().
[static]
QString
QStandardPaths::
displayName
(
QStandardPaths::StandardLocation
type
)
Returns a localized display name for the given location type or an empty QString if no relevant location can be found.
[static]
QString
QStandardPaths::
findExecutable
(const
QString
&
executableName
, const
QStringList
&
paths
= QStringList())
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 findExecutable 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 findExecutable("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.
若给定 executableName is an absolute path pointing to an executable, its clean path is returned.
[static]
QString
QStandardPaths::
locate
(
QStandardPaths::StandardLocation
type
, const
QString
&
fileName
,
QStandardPaths::LocateOptions
options
= LocateFile)
Finds a file or directory called fileName in the standard locations for type .
The
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]
QStringList
QStandardPaths::
locateAll
(
QStandardPaths::StandardLocation
type
, const
QString
&
fileName
,
QStandardPaths::LocateOptions
options
= LocateFile)
Finds all files or directories by the name, fileName , in the standard locations for type .
The
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]
void
QStandardPaths::
setTestModeEnabled
(
bool
testMode
)
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
,
AppDataLocation
,
ConfigLocation
,
GenericConfigLocation
,
AppConfigLocation
,
StateLocation
,
GenericStateLocation
,
GenericCacheLocation
，和
CacheLocation
. Other locations are not affected.
On Unix,
XDG_DATA_HOME
被设为
~/.qttest/share
,
XDG_CONFIG_HOME
被设为
~/.qttest/config
,
XDG_STATE_HOME
is set
~/.qttest/state
and
XDG_CACHE_HOME
被设为
~/.qttest/cache
.
On macOS, data goes to
~/.qttest/Application Support
, cache goes to
~/.qttest/Cache
, and config goes to
~/.qttest/Preferences
.
On Windows, everything goes to a "qttest" directory under
%APPDATA%
.
[static]
QStringList
QStandardPaths::
standardLocations
(
QStandardPaths::StandardLocation
type
)
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]
QString
QStandardPaths::
writableLocation
(
QStandardPaths::StandardLocation
type
)
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.