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<li class="toctree-l2"><a class="reference internal" href="../introduction/languages.html">Programming Languages</a></li>
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<li class="toctree-l3"><a class="reference internal" href="../guidelines/programming/coding-style.html">C Coding Style</a></li>
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<li class="toctree-l3"><a class="reference internal" href="../guidelines/programming/memory-management.html">Managing Memory</a></li>
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<li class="toctree-l3"><a class="reference internal" href="../guidelines/programming/optimizing.html">Optimizing GNOME Applications</a></li>
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<li class="toctree-l3"><a class="reference internal" href="../guidelines/programming/introspection.html">Introspection</a></li>
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<li class="toctree-l3"><a class="reference internal" href="../guidelines/accessibility/coding-guidelines.html">Coding Guidelines for Supporting Accessibility</a></li>
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<li class="toctree-l3"><a class="reference internal" href="../guidelines/accessibility/custom-widgets.html">Making Custom Components Accessible</a></li>
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<li class="toctree-l3"><a class="reference internal" href="../guidelines/localization/practices.html">Best Practices for Localization</a></li>
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<li class="toctree-l2 has-children"><a class="reference internal" href="../guidelines/maintainer.html">Maintainer Guidelines</a><input class="toctree-checkbox" id="toctree-checkbox-7" name="toctree-checkbox-7" role="switch" type="checkbox"/><label for="toctree-checkbox-7"><div class="visually-hidden">Toggle child pages in navigation</div><i class="icon"><svg><use href="#svg-arrow-right"></use></svg></i></label><ul>
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<li class="toctree-l3"><a class="reference internal" href="../guidelines/maintainer/api-stability.html">API Stability</a></li>
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<li class="toctree-l4"><a class="reference internal" href="beginners/getting_started/content_view.html">Adding A Content View</a></li>
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<li class="toctree-l4"><a class="reference internal" href="beginners/getting_started/saving_files.html">Saving The Content To A File</a></li>
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<li class="toctree-l4"><a class="reference internal" href="beginners/getting_started/saving_state.html">Saving The Application State</a></li>
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<li class="toctree-l4"><a class="reference internal" href="beginners/getting_started/adding_toasts.html">Notifying The User With Toasts</a></li>
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<li class="toctree-l4"><a class="reference internal" href="beginners/getting_started/dark_mode.html">Forcing The Dark Color Scheme</a></li>
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<li class="toctree-l3 has-children"><a class="reference internal" href="beginners/components.html">UI components</a><input class="toctree-checkbox" id="toctree-checkbox-11" name="toctree-checkbox-11" role="switch" type="checkbox"/><label for="toctree-checkbox-11"><div class="visually-hidden">Toggle child pages in navigation</div><i class="icon"><svg><use href="#svg-arrow-right"></use></svg></i></label><ul>
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<li class="toctree-l4"><a class="reference internal" href="beginners/components/window.html">Windows</a></li>
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<li class="toctree-l4"><a class="reference internal" href="beginners/components/stack.html">Stacks</a></li>
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<li class="toctree-l4"><a class="reference internal" href="beginners/components/radio_button.html">Radio Buttons</a></li>
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<li class="toctree-l4"><a class="reference internal" href="beginners/components/spin_button.html">Spin Buttons</a></li>
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<li class="toctree-l4"><a class="reference internal" href="beginners/components/link_button.html">Link Buttons</a></li>
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<li class="toctree-l4"><a class="reference internal" href="beginners/components/switch.html">Switches</a></li>
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<li class="toctree-l4"><a class="reference internal" href="beginners/components/menu_button.html">Menu Buttons</a></li>
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|||
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<li class="toctree-l4"><a class="reference internal" href="beginners/components/entry.html">Entries</a></li>
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<li class="toctree-l4"><a class="reference internal" href="beginners/components/password_entry.html">Password Entries</a></li>
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<li class="toctree-l4"><a class="reference internal" href="beginners/components/message_dialog.html">Messages</a></li>
|
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<li class="toctree-l4"><a class="reference internal" href="beginners/components/file_dialog.html">File Dialogs</a></li>
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<li class="toctree-l4"><a class="reference internal" href="beginners/components/spinner.html">Spinners</a></li>
|
|||
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<li class="toctree-l4"><a class="reference internal" href="beginners/components/level_bar.html">Level Bars</a></li>
|
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</ul>
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</li>
|
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</ul>
|
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</li>
|
|||
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<li class="toctree-l2 current current-page"><a class="current reference internal" href="#">Application ID</a></li>
|
|||
|
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<li class="toctree-l2"><a class="reference internal" href="application.html">Using GtkApplication</a></li>
|
|||
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<li class="toctree-l2"><a class="reference internal" href="save-state.html">Saving and Loading Window State</a></li>
|
|||
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<li class="toctree-l2"><a class="reference internal" href="notifications.html">Using Notifications</a></li>
|
|||
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<li class="toctree-l2"><a class="reference internal" href="themed-icons.html">Themed Icons</a></li>
|
|||
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<li class="toctree-l2"><a class="reference internal" href="deprecations.html">Dealing With Deprecations</a></li>
|
|||
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<li class="toctree-l2"><a class="reference internal" href="actions.html">Actions</a></li>
|
|||
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<li class="toctree-l2"><a class="reference internal" href="menus.html">Menus</a></li>
|
|||
|
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<li class="toctree-l2"><a class="reference internal" href="search-provider.html">Writing a Search Provider</a></li>
|
|||
|
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<li class="toctree-l2"><a class="reference internal" href="pre-and-post-conditions.html">Pre- and Post-Conditions</a></li>
|
|||
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<li class="toctree-l2"><a class="reference internal" href="main-contexts.html">Main Contexts</a></li>
|
|||
|
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<li class="toctree-l2"><a class="reference internal" href="lists.html">Using GLib Lists</a></li>
|
|||
|
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<li class="toctree-l2"><a class="reference internal" href="threading.html">Threading</a></li>
|
|||
|
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<li class="toctree-l2"><a class="reference internal" href="asynchronous-programming.html">Asynchronous Programming</a></li>
|
|||
|
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<li class="toctree-l2"><a class="reference internal" href="drag-and-drop.html">Drag and Drop</a></li>
|
|||
|
|
<li class="toctree-l2"><a class="reference internal" href="widget-templates.html">Widget Templates</a></li>
|
|||
|
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</ul>
|
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|
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</li>
|
|||
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</ul>
|
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</div>
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</div>
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</div>
|
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|
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</div>
|
|||
|
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</aside>
|
|||
|
|
<main class="main">
|
|||
|
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<div class="content">
|
|||
|
|
<article role="main">
|
|||
|
|
<label class="toc-overlay-icon toc-content-icon" for="__toc">
|
|||
|
|
<i class="icon"><svg><use href="#svg-toc"></use></svg></i>
|
|||
|
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</label>
|
|||
|
|
<section id="application-id">
|
|||
|
|
<h1>Application ID<a class="headerlink" href="#application-id" title="Permalink to this headline">#</a></h1>
|
|||
|
|
<p>GNOME technologies make extensive use of “reverse DNS” style identifiers for
|
|||
|
|
applications. One of the first things that you will need to do when developing
|
|||
|
|
an application is to choose an appropriate identifier.</p>
|
|||
|
|
<div class="admonition note">
|
|||
|
|
<p class="admonition-title">Note</p>
|
|||
|
|
<p>An example of such an identifier is “org.gnome.gedit”</p>
|
|||
|
|
</div>
|
|||
|
|
<p>Application identifiers are very widely used and changing them later can cause
|
|||
|
|
problems. For this reason, you should choose your identifier carefully, with an
|
|||
|
|
eye to the future of your application.</p>
|
|||
|
|
<section id="things-that-use-application-ids">
|
|||
|
|
<h2>Things that use application IDs<a class="headerlink" href="#things-that-use-application-ids" title="Permalink to this headline">#</a></h2>
|
|||
|
|
<p>Application IDs are used in the following places:</p>
|
|||
|
|
<ul class="simple">
|
|||
|
|
<li><p>by <code class="docutils literal notranslate"><span class="pre">GtkApplication</span></code> (or <code class="docutils literal notranslate"><span class="pre">GApplication</span></code>) as a method of identifying your
|
|||
|
|
application to the system, for ensuring that only one instance of your
|
|||
|
|
application is running at a given time, and as a way of passing messages to your
|
|||
|
|
application (such as an instruction to open a file)</p></li>
|
|||
|
|
<li><p>by D-Bus, to name your application on the message bus. This is the primary
|
|||
|
|
means of communicating between applications and is visible via the gdbus
|
|||
|
|
commandline tool or the d-feet graphical D-Bus browser.</p></li>
|
|||
|
|
<li><p>as the name of the <code class="docutils literal notranslate"><span class="pre">.desktop</span></code> file for your application. This file is how
|
|||
|
|
you describe your application to the system (so that it can be displayed in and
|
|||
|
|
launched by GNOME).</p></li>
|
|||
|
|
<li><p>as the base name of any GSettings schemas that your application may install.
|
|||
|
|
These names are visible via the gsettings commandline tool or the dconf-editor
|
|||
|
|
graphical editor.</p></li>
|
|||
|
|
<li><p>as a way for the system to remember state information about your applications
|
|||
|
|
(for example, which notifications it has requested to be shown to the user) and
|
|||
|
|
as a way for it to control settings about your application (for example, if its
|
|||
|
|
notifications have been blocked by the user)</p></li>
|
|||
|
|
<li><p>as a way for the system to use your application to extend itself (for example,
|
|||
|
|
by way of search providers)</p></li>
|
|||
|
|
<li><p>as the bundle name for application bundles, like Flatpak</p></li>
|
|||
|
|
</ul>
|
|||
|
|
</section>
|
|||
|
|
<section id="rules-for-application-ids">
|
|||
|
|
<h2>Rules for application IDs<a class="headerlink" href="#rules-for-application-ids" title="Permalink to this headline">#</a></h2>
|
|||
|
|
<p>The precise rules for what makes a valid application ID are as follows:</p>
|
|||
|
|
<ul class="simple">
|
|||
|
|
<li><p>the application ID must be composed of two or more elements separated by a
|
|||
|
|
period (‘.’) character</p></li>
|
|||
|
|
<li><p>each element must contain one or more of the alphanumeric characters (A-Z,
|
|||
|
|
a-z, 0-9) plus underscore (‘_’) and hyphen (‘-’) and must not start with a
|
|||
|
|
digit.</p></li>
|
|||
|
|
<li><p>the empty string is not a valid element (ie: your application ID may not start
|
|||
|
|
or end with a period and it is not valid to have two periods in a row)</p></li>
|
|||
|
|
<li><p>the entire ID must be less than 255 characters in length</p></li>
|
|||
|
|
</ul>
|
|||
|
|
<div class="admonition warning">
|
|||
|
|
<p class="admonition-title">Warning</p>
|
|||
|
|
<p>While hyphens are allowed, you should <strong>not</strong> use them in your application ID, as
|
|||
|
|
they are not supported by all components that might use the ID, like D-Bus.
|
|||
|
|
If you are using a real DNS name as the basis for your application ID, and
|
|||
|
|
the name contains an hyphen, you should replace it with an underscore. For
|
|||
|
|
instance: from <code class="docutils literal notranslate"><span class="pre">7-zip.org</span></code> to <code class="docutils literal notranslate"><span class="pre">org._7_zip</span></code>.</p>
|
|||
|
|
</div>
|
|||
|
|
<div class="admonition seealso">
|
|||
|
|
<p class="admonition-title">See also</p>
|
|||
|
|
<p>For more information on what constitutes a valid application id, you should
|
|||
|
|
read the documentation for <a class="reference external" href="https://docs.gtk.org/gio/type_func.Application.id_is_valid.html">g_application_id_is_valid()</a></p>
|
|||
|
|
</div>
|
|||
|
|
</section>
|
|||
|
|
<section id="guidelines-for-choosing-an-application-id">
|
|||
|
|
<h2>Guidelines for choosing an application ID<a class="headerlink" href="#guidelines-for-choosing-an-application-id" title="Permalink to this headline">#</a></h2>
|
|||
|
|
<p>The most important thing in choosing a name is that it must be globally unique.
|
|||
|
|
Bad things will happen if two unrelated applications try to use the same
|
|||
|
|
application ID.</p>
|
|||
|
|
<p>For this reason, it is very strongly recommended to choose a name based on the
|
|||
|
|
global public DNS system. For example, if you owned the domain yorba.org, you
|
|||
|
|
would probably want to name your application “myapp” like “org.yorba.myapp”.</p>
|
|||
|
|
<p>If your application is a member of or strongly affiliated with a given Free
|
|||
|
|
Software project then it is appropriate to use the public DNS name of that
|
|||
|
|
project, provided you follow their guidelines and policies. “Strongly
|
|||
|
|
affiliated” in this case generally means “using the version control,
|
|||
|
|
bugtracking, etc. of the project in question”.</p>
|
|||
|
|
<div class="admonition important">
|
|||
|
|
<p class="admonition-title">Important</p>
|
|||
|
|
<p>In the case of the GNOME project, applications which are hosted in the GNOME
|
|||
|
|
group on gitlab.gnome.org should use names like “org.gnome.myapp”.</p>
|
|||
|
|
</div>
|
|||
|
|
<p>Sometimes it is not possible to choose an ID based on a domain that you own. In
|
|||
|
|
this case, it is usually possible to fall back to something reasonable, such as
|
|||
|
|
an account name on a public provider. Names such as “com.github.username.myapp”
|
|||
|
|
or “com.gmail.myemailaddr.myapp” are examples of those.</p>
|
|||
|
|
</section>
|
|||
|
|
</section>
|
|||
|
|
|
|||
|
|
</article>
|
|||
|
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<footer>
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<div class="related-pages">
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<a class="next-page" href="application.html">
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<div class="page-info">
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|
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<div class="context">
|
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|
|
<span>Next</span>
|
|||
|
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</div>
|
|||
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<div class="title">Using GtkApplication</div>
|
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|
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</div>
|
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<svg><use href="#svg-arrow-right"></use></svg>
|
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</a>
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<a class="prev-page" href="beginners/components/level_bar.html">
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<svg><use href="#svg-arrow-right"></use></svg>
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<div class="context">
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<span>Previous</span>
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</div>
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<div class="title">Level Bars</div>
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</div>
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</a>
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</footer>
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<div class="toc-sticky toc-scroll">
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<div class="toc-title-container">
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<span class="toc-title">
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Contents
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</span>
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</div>
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<div class="toc-tree-container">
|
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|
|
<div class="toc-tree">
|
|||
|
|
<ul>
|
|||
|
|
<li><a class="reference internal" href="#">Application ID</a><ul>
|
|||
|
|
<li><a class="reference internal" href="#things-that-use-application-ids">Things that use application IDs</a></li>
|
|||
|
|
<li><a class="reference internal" href="#rules-for-application-ids">Rules for application IDs</a></li>
|
|||
|
|
<li><a class="reference internal" href="#guidelines-for-choosing-an-application-id">Guidelines for choosing an application ID</a></li>
|
|||
|
|
</ul>
|
|||
|
|
</li>
|
|||
|
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</ul>
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</aside>
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</main>
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</div><script data-url_root="../" id="documentation_options" src="../_static/documentation_options.js"></script>
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