- Qt 6.9
- Qt Core
- C++ Classes
- QLibraryInfo
- Qt 6.9.3 Reference Documentation

# QLibraryInfo Class

The QLibraryInfo class provides information about the Qt library. More...

Header: | `#include <QLibraryInfo>`
CMake: | `find_package(Qt6 REQUIRED COMPONENTS Core)` `target_link_libraries(mytarget PRIVATE Qt6::Core)`
qmake: | `QT += core`

- List of all members, including inherited members
- Deprecated members

## Public Types

enum | LibraryPath { PrefixPath, DocumentationPath, HeadersPath, LibrariesPath, LibraryExecutablesPath, …, SettingsPath }

## Static Public Members

bool | isDebugBuild()
`(since 6.5)` bool | isSharedBuild()
`(since 6.0)` QString | path(QLibraryInfo::LibraryPath p)
`(since 6.8)` QStringList | paths(QLibraryInfo::LibraryPath p)
QVersionNumber | version()

## Detailed Description

Many pieces of information are established when Qt is configured and built. This class provides an abstraction for accessing that information. By using the static functions of this class, an application can obtain information about the instance of the Qt library which the application is using at run-time.

You can also use a `qt.conf` file to override the hard-coded paths that are compiled into the Qt library. For more information, see the Using qt.conf documentation.

See also QSysInfo and Using qt.conf.

## Member Type Documentation

### enum QLibraryInfo::LibraryPath

This enum type is used to query for a specific path:

Constant | Value | Description
--- | --- | ---
`QLibraryInfo::PrefixPath` | `0` | The default prefix for all paths.
`QLibraryInfo::DocumentationPath` | `1` | The path to documentation upon install.
`QLibraryInfo::HeadersPath` | `2` | The path to all headers.
`QLibraryInfo::LibrariesPath` | `3` | The path to installed libraries.
`QLibraryInfo::LibraryExecutablesPath` | `4` | The path to installed executables required by libraries at runtime.
`QLibraryInfo::BinariesPath` | `5` | The path to installed Qt binaries (tools and applications).
`QLibraryInfo::PluginsPath` | `6` | The path to installed Qt plugins.
`QLibraryInfo::QmlImportsPath` | `7` | The path to installed QML extensions to import.
`QLibraryInfo::Qml2ImportsPath` | `QmlImportsPath` | This value is deprecated. Use QmlImportsPath instead.
`QLibraryInfo::ArchDataPath` | `8` | The path to general architecture-dependent Qt data.
`QLibraryInfo::DataPath` | `9` | The path to general architecture-independent Qt data.
`QLibraryInfo::TranslationsPath` | `10` | The path to translation information for Qt strings.
`QLibraryInfo::ExamplesPath` | `11` | The path to examples upon install.
`QLibraryInfo::TestsPath` | `12` | The path to installed Qt testcases.
`QLibraryInfo::SettingsPath` | `100` | The path to Qt settings. Not applicable on Windows.

See also path().

## Member Function Documentation

### `[static noexcept]` bool QLibraryInfo::isDebugBuild()

Returns `true` if this build of Qt was built with debugging enabled, or false if it was built in release mode.

### `[static noexcept, since 6.5]` bool QLibraryInfo::isSharedBuild()

Returns `true` if this is a shared (dynamic) build of Qt.

This function was introduced in Qt 6.5.

### `[static, since 6.0]` QString QLibraryInfo::path(QLibraryInfo::LibraryPath p)

Returns the path specified by p.

If there is more than one path listed in qt.conf, it will only return the first one.

This function was introduced in Qt 6.0.

See also paths.

### `[static, since 6.8]` QStringList QLibraryInfo::paths(QLibraryInfo::LibraryPath p)

Returns all paths specificied by p.

This function was introduced in Qt 6.8.

See also path.

### `[static noexcept]` QVersionNumber QLibraryInfo::version()

Returns the version of the Qt library.

See also qVersion().