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/****************************************************************************
**
** Copyright (C) 2015 The Qt Company Ltd.
** Contact: http://www.qt.io/licensing/
**
** This file is part of the documentation of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:FDL$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see http://www.qt.io/terms-conditions. For further
** information use the contact form at http://www.qt.io/contact-us.
**
** GNU Free Documentation License Usage
** Alternatively, this file may be used under the terms of the GNU Free
** Documentation License version 1.3 as published by the Free Software
** Foundation and appearing in the file included in the packaging of
** this file. Please review the following information to ensure
** the GNU Free Documentation License version 1.3 requirements
** will be met: http://www.gnu.org/copyleft/fdl.html.
** $QT_END_LICENSE$
**
****************************************************************************/
/*!
\page qt-conf.html
\title Using qt.conf
The \c qt.conf file overrides the hard-coded paths that are
compiled into the Qt library. These paths are accessible using the
QLibraryInfo class. Without \c qt.conf, the functions in
QLibraryInfo return these hard-coded paths; otherwise they return
the paths as specified in \c qt.conf.
Without \c qt.conf, the Qt libraries will use the hard-coded paths
to look for plugins, translations, and so on. These paths may not
exist on the target system, or they may not be
accesssible. Because of this, you need \c qt.conf to make the Qt
libraries look elsewhere.
QLibraryInfo will load \c qt.conf from one of the following locations:
\list 1
\o \c :/qt/etc/qt.conf using the resource system
\o on Mac OS X, in the Resource directory inside the application
bundle, for example \c assistant.app/Contents/Resources/qt.conf
\o in the directory containing the application executable, i.e.
QCoreApplication::applicationDirPath() + QDir::separator() + "qt.conf"
\endlist
The \c qt.conf file is an INI text file, as described in the \l
{QSettings::Format}{QSettings} documentation. The file should have
a \c Paths group which contains the entries that correspond to
each value of the QLibraryInfo::LibraryLocation enum. See the
QLibraryInfo documentation for details on the meaning of the
various locations.
\table
\header \o Entry \o Default Value
\row \o Prefix \o QCoreApplication::applicationDirPath()
\row \o Documentation \o \c doc
\row \o Headers \o \c include
\row \o Libraries \o \c lib
\row \o Binaries \o \c bin
\row \o Plugins \o \c plugins
\row \o Imports \o \c imports
\row \o Data \o \c .
\row \o Translations \o \c translations
\row \o Settings \o \c .
\row \o Examples \o \c .
\row \o Demos \o \c .
\endtable
Absolute paths are used as specified in the \c qt.conf file. All
paths are relative to the \c Prefix. On Windows and X11, the \c
Prefix is relative to the directory containing the application
executable (QCoreApplication::applicationDirPath()). On Mac OS X,
the \c Prefix is relative to the \c Contents in the application
bundle. For example, \c application.app/Contents/plugins/ is the
default location for loading Qt plugins. Note that the plugins
need to be placed in specific sub-directories under the
\c{plugins} directory (see \l{How to Create Qt Plugins} for
details).
For example, a \c qt.conf file could contain the following:
\snippet doc/src/snippets/code/doc_src_qt-conf.qdoc 0
Subgroups of the \c Paths group may be used to specify locations
for specific versions of the Qt libraries. Such subgroups are of
the form \c Paths/x.y.z, where x is the major version of the Qt
libraries, y the minor, and z the patch level. The subgroup that
most closely matches the current Qt version is used. If no
subgroup matches, the \c Paths group is used as the fallback. The
minor and patch level values may be omitted, in which case they
default to zero.
For example, given the following groups:
\snippet doc/src/snippets/code/doc_src_qt-conf.qdoc 1
The current version will be matched as shown:
\list
\o 4.0.1 matches \c Paths/4
\o 4.1.5 matches \c Paths/4.1
\o 4.6.3 matches \c Paths/4.2.5 (because 4.2.5 is the latest version with the same major version number)
\o 5.0.0 matches \c Paths
\o 6.0.2 matches \c Paths/6
\endlist
*/
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