| The trend archive Cicode is designed for
archiving files that may need to be viewed at a later date, it is
not designed as a total trend backup system. Following is a brief
description of the steps in the process. The text in the
Trendarc.ci file should also be read before attempting to setup.
Backup selected trends
This option allows the user to select the trends that are to be
archived. The Code will copy all the files for the selected trends
to the backup directory (backup directory selected from the
Configure form). Then it will invoke CtBackup.exe or CtBack32.exe
and archive all the files from the backup directory except the HST
files. The compressed archive will be called CTTREND.001 and will
be stored as per the Configure form. The compression uses the PKZIP
algorithm however the file format is different.
Backup all Trends
This option does the same as the above except it copies all the
trends in the system. This may take a long time in a large system.
Also the code is not really optimised for archiving hundreds of
megabytes of trend data.
Restore Trends
This option restores the trends from a CTTREND.001 file and places
the trend files in the restore directory as specified by the
Configure form. The restore directory must be separate from the
directory that stores the online trend files, ie as specified in
the "Trend Tags" form.
Attach Files
This option attaches all the files in the restore directory to the
trend system using the TrendAddHistory() Cicode function. After
completing this step the trends will be viewable by selecting the
appropriate Time / Date on the trend screen.
Remove Files
This option get all the file names from the restore directory and
pass these names to the TrendDelHistory() function thus removing
the files from the trend system. The files are not deleted, the
files will be deleted the next time a restore is done to the same
directory. (This operation is identical to "Attach Files" however
it calls TrendDelHistory() instead).
It is possible to have multiple restore directories if you
require multiple archives to be attached at the same time. The
attached files are not affected by the normal rotation of the
online trend files. To achieve this, create a new directory then
select this directory as the restore directory in the Configure
form, then do a restore and attach. Repeat this for each archive
that you wish to add.
See Trendarc.ci in the Example project for more info.
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