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87  <div class="section" id="pvmail-py-graphical-user-interface">
88<span id="gui"></span><h1> graphical user interface<a class="headerlink" href="#pvmail-py-graphical-user-interface" title="Permalink to this headline">¶</a></h1>
89<p id="index-0">The PvMail program GUI is started from the command line with the <tt class="docutils literal"><span class="pre">-g</span></tt>
90or <tt class="docutils literal"><span class="pre">--gui</span></tt> command-line options.
91If either GUI option is used, then the positional arguments
92(<tt class="docutils literal"><span class="pre">triggerPV</span> <span class="pre">messagePV</span> <span class="pre">email&#64;address</span></tt>) are optional.
93Without either GUI option, the
94command-line interface is started.:</p>
95<div class="highlight-python"><pre>$ ./ -g &amp;</pre>
97<div class="admonition tip">
98<p class="first admonition-title">Tip</p>
99<p class="last">Usually, you want to run the GUI as a background task by appending
100the ampersand (<tt class="docutils literal"><span class="pre">&amp;</span></tt>) on the command line, as shown above.</p>
102<div class="figure">
103<img alt="_images/gui.png" src="_images/gui.png" style="width: 300pt;" />
104<p class="caption">GUI of the <em>PvMail</em> application</p>
106<p>The GUI provides editable text entry widgets for each of the required
107command-line terms (a.k.a. <em>positional arguments</em>):
108<tt class="docutils literal"><span class="pre">trigger_PV</span> <span class="pre">message_PV</span> <span class="pre">email_addresses</span></tt>.
109The list of email addresses is separated.  The GUI provides a tool
110to add additional address or remove addresses.</p>
111<div class="admonition warning">
112<p class="first admonition-title">Warning</p>
113<p class="last">At present, the GUI provides few visual cues
114about the success of PV connections or even
115that the program is working.  This will be fixed soon.</p>
117<p>The GUI also shows (using <em>True</em> or <em>False</em> text) whether or not
118the PV monitor process is running.</p>
119<div class="admonition warning">
120<p class="first admonition-title">Warning</p>
121<p class="last">If either of the PVs fails to connect, it is likely that the GUI may
122become confused whether or not it is running.  In such cases, press
123the <em>Stop</em> button, then press the <em>Run</em> button to try to restart monitoring.</p>
125<p>All PvMail monitoring will be stopped if the GUI window is closed.
126At present, there is no feature to detach or reattach a monitor set.
127Also, PvMail can only monitor a single set of PVs using the current design.
128A request to enhance this capability is on the TODO list (see <a class="reference internal" href="info.html#todo"><em>TODO items for the next release</em></a>).</p>
129<p>At the bottom of the GUI panel, a status line is shown.  At present, this
130does not indicate the status of the monitoring process.  Again,
131this will be fixed soon.</p>
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