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Monthly log files: Difference between revisions
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= Introduction =
This article is about the log file that contains the values at whatever interval you have set for Cumulus to keep detailed logging. The main files are automatically created with names in the form <Month><Year>log.txt (for example, the file for August 2009 is called <tt>Aug09log.txt</tt>); an entry is made to the current month's file every ''ten'' (default value; you can change this on the station settings screen) minutes, recording the current sensor values. The file is in comma-separated format with one line per entry.▼
▲This article is about the log file that contains the values at whatever interval you have set for Cumulus to keep detailed logging. The main files are automatically created with names in the form <Month><Year>log.txt (for example, the file for August 2009 is often called <tt>Aug09log.txt</tt>), but the month can be in another language or a different abbreviation depending on your locale; an entry is made to the current month's file every ''ten'' (default value; you can change this on the station settings screen) minutes, recording the current sensor values. The file is in comma-separated format with one line per entry. Being comma separated does not mean the fields in this log are always separated by commas, they might use semi-colon (;) for example.
See [[speciallog.txt]] for the equivalent log file for detailed logging of internal temperature and humidity.
= File content =
This file has one line added each time the Cumulus timer says the logging interval has passed. All data is logged in the units which which have been selected by the user on the station configuration screen.
Each line has a number of fields separated by whatever symbol is defined as the list separator on your device, typically a comma (,) or a semi-colon (;).
* The various fields are all listed later in this article, but they can be of various types:
** Date, this is always the first field, and it always uses a fixed format, ignoring the format defined in your locale.
** Time, this always the second field, and is always in the form hh:mm (Cumulus will not be able to understand the file if you edit the time to a format that includes seconds) using the 24 hour clock and local time (system time). However, if you use the feature in MX to upload the equivalent of this file to a database table, the upload will add ":00" to include seconds. Note that it is perfectly possible to have two successive lines in a monthly log file with same time, although this should not happen in normal running, it can result from a hiccup or other interference on your device. If you are asking MX to upload the contents of this file, a second line with same time is ignored, only the first line with a particular date and time is uploaded.
** All Remaining fields are spot values, either what has just been read from your station, or a derived value calculated from a set of values read from your station. For these value fields, Cumulus may have converted from the unit used by your weather station to the unit that you have requested to use, and there will be some inaccuracy inevitable in such conversions. Where the value to be stored is a real number with decimal places, Cumulus will use a decimal comma or decimal point depending on which is defined in your locale, do be careful not to change that locale if you need to change your device or update it, as Cumulus can only read files where the same decimal separator is used everywhere.
For ''more information'' on these files see in the '''Cumulus help''' file, in the section “The Data log file”.
=File Locking restricting access by other processes =
As the log file for the current month will be updated frequently by Cumulus (when it is running), Cumulus applies an exclusive lock, and (as explained further below) conflicts can happen if another process seeks to access this file. Consequently don't let your antivirus scans access this file, nor try to edit it outside Cumulus while Cumulus is running.
Also note these log files do not include a header line, but the appropriate headers can be found for the installed version of Cumulus by looking at "Cumulus\monthlyfileheader.txt", i.e. in the directory above the 'data' directory containing the monthly log. The viewing method described next automatically includes the header line.
== Cumulus 1 ==
In the '''View''' menu of Cumulus 1, select ''Data logs'', click '''Load...'''. The standard Windows File Select dialogue is displayed for the 'data' subdirectory of the Cumulus installation directory. Select the required monthly log, click '''Open''' and you will see the contents in a neat table with column headings, rows striped, and the date/time on a lighter background. This is a text viewer, and works best when at full screen, but even then you are likely to need to scroll both horizontally and vertically to look at all the figures. If you click on an individual figure the cell will be highlighted, but you cannot edit the figures on a view screen.▼
In the '''View''' menu of Cumulus 1, select ''Data logs'', click '''Load...'''.
The standard Windows File Select dialogue is displayed for the 'data' subdirectory of the Cumulus installation directory.
▲
== Cumulus MX ==
In the admin interface, there is a "Data Logs" tab, from it select ''Data logs'' and then you see a date selector for selecting the log you want to display. Next to it is a "Load" button.
Like Cumulus 1, this displays the log, but does not provide editing facility, again it provides column headings, and again you can move between pages to see different sections of the file.
== Problems ==
If no logs seen, see [[FAQ#I_can.E2.80.99t_find_my_data_files.21|FAQ: I can't find my data files]]. Also note, this '''Data logs''' viewer is only for viewing monthly log files (not any other files in the same ''data'' directory), the column headings for standard monthly log files will always be shown at the top of the screen.
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