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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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|
||
<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>
|
||
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|
||
|
||
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Contents
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<div class="toc-tree-container">
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<div class="toc-tree">
|
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<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>
|
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</ul>
|
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</li>
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