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<!-- Weave of 'Telemetry' generated by Inweb -->
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< ul class = "crumbs" > < li > < a href = "../index.html" > Home< / a > < / li > < li > < a href = "../compiler.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 >
< 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" > < / 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
to monitor how a whole class is using the system.
< / p >
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< p class = "commentary" > Nothing is done unless a filename is sent to the following function:
< / p >
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< pre class = "displayed-code all-displayed-code code-font" >
< 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 >
< 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 >
< 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 >
< span class = "plain-syntax" > }< / span >
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< / pre >
< p class = "commentary firstcommentary" > < a id = "SP2" > < / a > < b > § 2. < / b > A little lazily, the telemetry file once opened stays open until the process
finishes.
< / 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 >
< 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 >
< 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 >
< 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#SP8" > § 8< / 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 >
< 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 >
< 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 >
< 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-pl0.html#SP9" class = "function-link" > < span class = "function-syntax" > Problems::Fatal::filename_related< / 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 >
< 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 >
< 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 >
< 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 >
< 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 >
< 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 >
< 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 >
< 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 >
< 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 >
< span class = "plain-syntax" > }< / span >
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< / pre >
< p class = "commentary firstcommentary" > < a id = "SP3" > < / a > < b > § 3. < / b > And log messages can be written here:
< / 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 >
< span class = "plain-syntax" > }< / span >
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< / pre >
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