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/****************************************************************************
**
** Copyright (c) 2013 Digia Plc and/or its subsidiary(-ies).
** Contact: http://www.qt-project.org/legal
**
** This file is part of Qt Creator
**
**
** GNU Free Documentation License
**
** 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.
**
**
****************************************************************************/
/*!
\contentspage index.html
\previouspage creator-help.html
\page creator-faq.html
\nextpage creator-tips.html
\title FAQ
This section contains answers to some frequently asked questions about \QC.
You might also find answers to your questions in the
\l{Known Issues} and \l{Tips and Tricks} sections, or the Troubleshooting
sections for a special area, such as
\l{Troubleshooting Debugger}{debugging}.
\section1 General Questions
\b {How do I reset all \QC settings?}
\QC creates the following files and directories:
\list
\li QtCreator.db
\li QtCreator.ini
\li qtversion.xml
\li toolChains.xml
\li qtcreator
\li qtc-debugging-helper
\li qtc-qmldbg
\li qtc-qmldump
\li qtc-qmlobserver
\endlist
The location depends on the platform. On Linux and other Unix platforms, the files
are located in \c {~/.config/QtProject} and \c {~/.local/share/data/QtProject/qtcreator}.
On Mac OS, the files are located in \c {~/.config/QtProject} and
\c {~/Library/Application Support/QtProject/Qt Creator}.
On Windows XP, the files are located in
\c {<drive>:\Documents and Settings\<username>\Application Data\QtProject} and
\c {<drive>:\Documents and Settings\<username>\Local Settings\Application Data\QtProject}.
On Windows Vista and Windows 7, the files are located in
\c {<drive>:\Users\<username>\AppData\Roaming\QtProject} and
\c {<drive>:\Users\<username>\AppData\Local\QtProject}.
\b {\QC comes with MinGW, should I use this version with Qt?}
Use the version that was built against the Qt version.
\b {\QC does not find a helper application, such as Git or a
compiler. What should I do?}
Make sure that the application is in your system PATH when starting \QC.
Also select \gui {Tools > Options} to check the settings specified
for the application. Many plugins specify either the path to the tool they
need or the environment they run in.
This is especially relevant for the Mac OS where \c {/usr/local/bin} might
not be in the path when \QC is started.
\b {How do I change the interface language for \QC?}
\QC has been localized into several languages. If the system
language is one of the supported languages, it is automatically selected.
To change the language, select \gui {Tools > Options > Environment} and
select a language in the \gui Language field. The change takes effect after
you restart \QC.
\b {Has a reported issue been addressed?}
You can look up any issue in the
\l{http://bugreports.qt-project.org/}{Qt bug tracker}.
\if defined(qcmanual)
\include widgets/creator-faq-qtdesigner.qdocinc
\endif
\section1 Help Questions
\b {The Qt API Reference Documentation is missing and context help does
not find topics. What can I do?}
\QC comes fully integrated with Qt documentation and examples using
the Qt Help plugin. The integrated Qt Reference Documentation is available
for Qt 4.4 and later. \QC, \QSDK, and other Qt deliverables contain
documentation as .qch files. All the documentation is accessible in the
\gui Help mode.
To view the documentation that is available and to add documentation,
select \gui {Tools > Options > Help > Documentation}. For more
information, see \l{Adding External Documentation}.
\section1 Debugger Questions
For information on troubleshooting debugger, see
\l{Troubleshooting Debugger}.
\b {If I have a choice of GDB versions, which should I use?}
On Linux and Windows, use the Python-enabled GDB versions that are
installed when you install \QC and Qt SDK. On Mac OS X, use the GDB
provided with Xcode. For a custom target, you can build your own
Python-enabled GDB. Follow the instructions in
\l{http://qt-project.org/wiki/QtCreatorBuildGdb}{Building GDB}.
You must use Python version 2.6 or 2.7.
For more information on setting up debugger, see \l{Setting Up Debugger}.
\b {How do I generate a core file in \QC?}
To trigger the GDB command that generates a core file while debugging,
select \gui {Window > Views > Debugger Log}. In the \gui Command field,
type \c gcore and press \key Enter. The core file is created in the
current working directory. You can specify another location for the file,
including a relative or absolute path, as an argument of the command.
To generate a temporary core file, select \gui {Create Snapshot} in the
context menu in the \gui Snapshot view. The core file is deleted when you
stop debugging.
\section1 Compiler Questions
\b {How can I make use of my multi-core CPU with \QC?}
On Linux and Mac OS X, go to \gui Project mode, select your configuration
in the \gui {Build Settings}, locate the \gui {Build Steps}, and add the
following value, where \c{<num>} is the amount of cores in your CPU:
\c{-j <num>}
On Windows, nmake does not support the \c{-j} parameter. Instead, we
provide a drop-in replacement called jom. You can download a precompiled
version of jom from \l{http://releases.qt-project.org/jom/}{Qt Project Release server}.
Put jom.exe in a location in the %PATH%. Go to the \gui {Build Settings}
and set jom.exe as the make command.
\note: Unlike GNU make, jom automatically detects your cores and spawns as
many parallel processes as your CPU has cores. You can override this
behavior by using the \c{-j} parameter as described above.
\section1 Qt SDK Questions
\b {I cannot use QSslSocket with the SDK. What should I do?}
The Qt build in the SDK is built with QT_NO_OPENSSL defined. Rebuilding it
is possible. For more information, see
\l{http://www.qtcentre.org/threads/19222-Qssl}.
\b {Which development packages from the distribution are needed on
Ubuntu or Debian?}
\code
sudo apt-get install libglib2.0-dev libSM-dev libxrender-dev libfontconfig1-dev libxext-dev
\endcode
If you use QtOpenGL, you also need:
\code
sudo apt-get install libgl-dev libglu-dev
\endcode
\section1 Platform Related Questions
\b {Where is application output shown in \QC?}
\b {On Unix (Linux and Mac OS):} \c qDebug() and related functions use
the standard output and error output. When you run or debug the
application, you can view the output in the \gui{Application Output} pane.
For console applications that require input, select \gui {Projects > Run
Settings > Run in terminal}.
\b {On Windows:} Output is displayed differently for \e{console
applications} and \e{GUI applications}.
The setting \c {CONFIG += console} in the .pro file specifies that the
application is built as a console application using some other runtime.
When you run a console application, you can view the output in the console
window of the calling application. If the
calling application is a GUI application (for example, a release-built
version of \QC), a new console window is opened. For this
type of application, \c qDebug() and related functions use standard output
and error output.
We recommend that you select \gui {Projects > Run Settings > Run in
terminal} for console applications.
For GUI applications, \c qDebug() and related functions use the Windows API
function \c OutputDebugString(). The output is displayed in the
\gui{Application Output} pane. However, only one output pane tab may be
open at a time or the output is not displayed correctly. You can use an
external debug output viewer, such as the
\l{http://technet.microsoft.com/en-us/sysinternals/bb896647}{DebugView for Windows}
to display output from GUI applications.
\section1 Questions about New Features
\b {Will a requested feature be implemented?}
If it is a scheduled feature, you can see this in the task tracker. If a
feature already has been implemented, it is mentioned in the
\l{http://qt.gitorious.org/qt-creator/qt-creator/trees/master/dist}{changes file}
for the upcoming release.
\b {Why does \QC not use tabs for editors?}
This question comes up from time to time, so we have considered it
carefully. Here are our main reasons for not using tabs:
\list
\li Tabs do not scale. They work fine if you have 5 to 6 editors open,
they become cumbersome with 10, and if you need more horizontal
space than the tab bar, the interface does not work at all.
\li Tabs do not adapt to your working set.
\li The common solution is to give the user the ability to reorder
tabs. Now user has to manage tabs instead of writing code.
\li Tabs force you to limit the amount of open editors, because
otherwise you get confused.
\endlist
Consider the following use case: \e {Developers want to switch editors.}
In fact, developers do not want to switch editors, but might have to do so
to accomplish their tasks. We need to figure out what the tasks are to
provide developers with better ways to navigate while performing the tasks.
One common factor in many use cases is switching editors while working on a
set of open files. While working on files A and B, users sometimes need to
look at file C. They can press \key Ctrl+Tab to move between the files and
have the files open in the correct editor according to file type. The list
is sorted by last used.
Typically, users also work on multiple classes or functions that are
related, even though they are defined or declared in different files.
\QC provides two shortcuts for that: \key F2 to follow the symbol
and \key Ctrl+Shift+U to find usages.
In addition, developers can:
\list
\li Press \key F4 to switch between header and source.
\li Press \key Alt+Left to move backwards in the navigation history.
\li Use the locator (Ctrl+K) to simply tell \QC where to go.
\endlist
The locator can be used to open files, but opening files is also just a
step on the way to accomplish a task. For example, consider the following
use case: \e {Fix AMethod in SomeClass which comes from
someclass.cpp/someclass.h}.
With a tabbed user interface, developers would search for someclass.cpp in
the tab bar, and then search for \c {::AMethod}, only to find out that the
method is not located in that file. They would then search for someclass.h
in the tab bar, find our that the function is inline, fix the problem, and
forget where they came from.
With \QC, developers can type \c {Ctrl+K m AMet} to find the method.
Typically, they only need to type 3 to 4 characters of the method name.
They can then fix the problem and press \key Alt+Back to go back to where
they were.
Other locator filters include \c c for classes, \c : for all symbols, and
(thanks to a community contribution) \c . for symbols in the current file.
*/
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