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<main role="main">
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<!--Weave of 'Telemetry' generated by Inweb-->
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<div class="breadcrumbs">
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<ul class="crumbs"><li><a href="../index.html">Home</a></li><li><a href="../services.html">Services</a></li><li><a href="index.html">problems</a></li><li><a href="index.html#1">Chapter 1: Starting Up</a></li><li><b>Telemetry</b></li></ul></div>
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<p class="purpose">An optional facility for transcribing the outcome of runs of software.</p>
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<p class="commentary firstcommentary"><a id="SP1" class="paragraph-anchor"></a><b>§1. </b>The telemetry file is optional, and transcribes the outcome of each run. This
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is mainly for testing Inform, but may also be useful for teachers who want
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to monitor how a whole class is using the system.
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</p>
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<p class="commentary">Nothing is done unless a filename is sent to the following function:
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</p>
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<pre class="displayed-code all-displayed-code code-font">
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<span class="identifier-syntax">filename</span><span class="plain-syntax"> *</span><span class="identifier-syntax">spool_telemetry_to</span><span class="plain-syntax"> = </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">;</span>
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<span class="reserved-syntax">void</span><span class="plain-syntax"> </span><span class="function-syntax">Telemetry::locate_telemetry_file</span><span class="plain-syntax">(</span><span class="identifier-syntax">filename</span><span class="plain-syntax"> *</span><span class="identifier-syntax">F</span><span class="plain-syntax">) {</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">spool_telemetry_to</span><span class="plain-syntax"> = </span><span class="identifier-syntax">F</span><span class="plain-syntax">;</span>
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<span class="plain-syntax">}</span>
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</pre>
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<p class="commentary firstcommentary"><a id="SP2" class="paragraph-anchor"></a><b>§2. </b>A little lazily, the telemetry file once opened stays open until the process
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finishes.
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</p>
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<pre class="displayed-code all-displayed-code code-font">
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<span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">attempts_to_open_telemetry</span><span class="plain-syntax"> = </span><span class="constant-syntax">0</span><span class="plain-syntax">;</span>
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<span class="identifier-syntax">text_stream</span><span class="plain-syntax"> </span><span class="identifier-syntax">telemetry_file_struct</span><span class="plain-syntax">; </span><span class="comment-syntax"> The actual telemetry file (if created)</span>
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<span class="identifier-syntax">text_stream</span><span class="plain-syntax"> *</span><span class="identifier-syntax">telemetry_file</span><span class="plain-syntax"> = &</span><span class="identifier-syntax">telemetry_file_struct</span><span class="plain-syntax">; </span><span class="comment-syntax"> Main telemetry stream</span>
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<span class="identifier-syntax">text_stream</span><span class="plain-syntax"> *</span><span class="identifier-syntax">telmy</span><span class="plain-syntax"> = </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">; </span><span class="comment-syntax"> Current telemetry stream</span>
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<span class="reserved-syntax">void</span><span class="plain-syntax"> </span><span class="function-syntax">Telemetry::ensure_telemetry_file</span><button class="popup" onclick="togglePopup('usagePopup1')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup1">Usage of <span class="code-font"><span class="function-syntax">Telemetry::ensure_telemetry_file</span></span>:<br/><a href="1-tlm.html#SP3">§3</a><br/>Problems, Level 0 - <a href="2-pl0.html#SP9">§9</a></span></button><span class="plain-syntax">(</span><span class="reserved-syntax">void</span><span class="plain-syntax">) {</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">spool_telemetry_to</span><span class="plain-syntax"> == </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">) </span><span class="reserved-syntax">return</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">telmy</span><span class="plain-syntax">) </span><span class="reserved-syntax">return</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">attempts_to_open_telemetry</span><span class="plain-syntax">++ > </span><span class="constant-syntax">0</span><span class="plain-syntax">) </span><span class="reserved-syntax">return</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">STREAM_OPEN_TO_FILE_APPEND</span><span class="plain-syntax">(</span><span class="identifier-syntax">telemetry_file</span><span class="plain-syntax">, </span><span class="identifier-syntax">spool_telemetry_to</span><span class="plain-syntax">, </span><span class="identifier-syntax">ISO_ENC</span><span class="plain-syntax">) == </span><span class="identifier-syntax">FALSE</span><span class="plain-syntax">)</span>
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<span class="plain-syntax"> </span><a href="2-pl2.html#SP15" class="function-link"><span class="function-syntax">Problems::fatal_on_file</span></a><span class="plain-syntax">(</span><span class="string-syntax">"Can't open telemetry file"</span><span class="plain-syntax">, </span><span class="identifier-syntax">spool_telemetry_to</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">telmy</span><span class="plain-syntax"> = </span><span class="identifier-syntax">telemetry_file</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">WRITE_TO</span><span class="plain-syntax">(</span><span class="identifier-syntax">telmy</span><span class="plain-syntax">, </span><span class="string-syntax">"\n-- -- -- -- -- -- -- --\n%B (build %B): telemetry.\n"</span><span class="plain-syntax">,</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">FALSE</span><span class="plain-syntax">, </span><span class="identifier-syntax">TRUE</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">this_month</span><span class="plain-syntax"> = </span><span class="identifier-syntax">the_present</span><span class="plain-syntax">-></span><span class="identifier-syntax">tm_mon</span><span class="plain-syntax"> + </span><span class="constant-syntax">1</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">this_day</span><span class="plain-syntax"> = </span><span class="identifier-syntax">the_present</span><span class="plain-syntax">-></span><span class="identifier-syntax">tm_mday</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">this_year</span><span class="plain-syntax"> = </span><span class="identifier-syntax">the_present</span><span class="plain-syntax">-></span><span class="identifier-syntax">tm_year</span><span class="plain-syntax"> + </span><span class="constant-syntax">1900</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">WRITE_TO</span><span class="plain-syntax">(</span><span class="identifier-syntax">telmy</span><span class="plain-syntax">, </span><span class="string-syntax">"Running on %4d-%02d-%02d at %02d:%02d.\n\n"</span><span class="plain-syntax">,</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">this_year</span><span class="plain-syntax">, </span><span class="identifier-syntax">this_month</span><span class="plain-syntax">, </span><span class="identifier-syntax">this_day</span><span class="plain-syntax">, </span><span class="identifier-syntax">the_present</span><span class="plain-syntax">-></span><span class="identifier-syntax">tm_hour</span><span class="plain-syntax">, </span><span class="identifier-syntax">the_present</span><span class="plain-syntax">-></span><span class="identifier-syntax">tm_min</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">LOG</span><span class="plain-syntax">(</span><span class="string-syntax">"Opening telemetry file.\n"</span><span class="plain-syntax">);</span>
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<span class="plain-syntax">}</span>
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</pre>
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<p class="commentary firstcommentary"><a id="SP3" class="paragraph-anchor"></a><b>§3. </b>And log messages can be written here:
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</p>
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<pre class="displayed-code all-displayed-code code-font">
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<span class="reserved-syntax">void</span><span class="plain-syntax"> </span><span class="function-syntax">Telemetry::write_to_telemetry_file</span><span class="plain-syntax">(</span><span class="identifier-syntax">wchar_t</span><span class="plain-syntax"> *</span><span class="identifier-syntax">m</span><span class="plain-syntax">) {</span>
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<span class="plain-syntax"> </span><a href="1-tlm.html#SP2" class="function-link"><span class="function-syntax">Telemetry::ensure_telemetry_file</span></a><span class="plain-syntax">();</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">WRITE_TO</span><span class="plain-syntax">(</span><span class="identifier-syntax">telmy</span><span class="plain-syntax">, </span><span class="string-syntax">"The user says:\n\n%w\n\n"</span><span class="plain-syntax">, </span><span class="identifier-syntax">m</span><span class="plain-syntax">);</span>
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<span class="plain-syntax">}</span>
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</pre>
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