- Qt 5.15
- Qt Core
- C++ Classes
- QLibraryInfo
- Qt 5.15.18 Reference Documentation

# QLibraryInfo Class

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

Header: | #include <QLibraryInfo>
qmake: | QT += core

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

## Public Types

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

## Static Public Members

bool | isDebugBuild()
QString | location(LibraryLocation loc)
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::LibraryLocation

This enum type is used to specify a specific location specifier:

Constant | Value | Description
--- | --- | ---
`QLibraryInfo::PrefixPath` | `0` | The default prefix for all paths.
`QLibraryInfo::DocumentationPath` | `1` | The location for documentation upon install.
`QLibraryInfo::HeadersPath` | `2` | The location for all headers.
`QLibraryInfo::LibrariesPath` | `3` | The location of installed libraries.
`QLibraryInfo::LibraryExecutablesPath` | `4` | The location of installed executables required by libraries at runtime.
`QLibraryInfo::BinariesPath` | `5` | The location of installed Qt binaries (tools and applications).
`QLibraryInfo::PluginsPath` | `6` | The location of installed Qt plugins.
`QLibraryInfo::ImportsPath` | `7` | The location of installed QML extensions to import (QML 1.x).
`QLibraryInfo::Qml2ImportsPath` | `8` | The location of installed QML extensions to import (QML 2.x).
`QLibraryInfo::ArchDataPath` | `9` | The location of general architecture-dependent Qt data.
`QLibraryInfo::DataPath` | `10` | The location of general architecture-independent Qt data.
`QLibraryInfo::TranslationsPath` | `11` | The location of translation information for Qt strings.
`QLibraryInfo::ExamplesPath` | `12` | The location for examples upon install.
`QLibraryInfo::TestsPath` | `13` | The location of installed Qt testcases.
`QLibraryInfo::SettingsPath` | `100` | The location for Qt settings. Not applicable on Windows.

See also location().

## Member Function Documentation

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

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

This function was introduced in Qt 5.0.

### `[static]` QString QLibraryInfo::location(LibraryLocation loc)

Returns the location specified by loc.

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

Returns the version of the Qt library.

This function was introduced in Qt 5.8.

See also qVersion().