How to update resolution details: the Update Resource command

The Resolutions and Documents tables reflect the files stored on the EMu server (the media for each Multimedia record is placed in a directory on the server). The naming convention for the directory structure is based on the IRN (Internal Record Number) of the Multimedia record, which is padded out to at least four digits by zero filling the front of the number. Hence, an IRN of 10 becomes 0010 and 34567 remains as 34567. The number is then split by adding a directory marker in front of the third last digit.

For example

If the Multimedia record has an IRN of 234, a path of 0/234 is generated; an IRN of 10 generates 0/010 and an IRN of 34567 generates 34/567. This generated path is appended to the pathway set in the ServerMediaPath Registry entry to form the full path to media files for the given Multimedia record.

Thus, if ServerMediaPath has a value of /home/emu/cmcc/multimedia and a media record with an IRN of 12010 is saved, the following path would be generated:

/home/emu/cmcc/multimedia/12/010

Within this directory each file represents one media entry. Each file's naming convention is consistent with the media type, basename.size.format for image files and basename.format for other media files. In an image directory you may see:

`18`	`-rw-r-----`	`1`	`emu`	`emuadmin`	`8343`	`Sep 17 09:07`	`Ed.100x100.gif`
`120`	`-rw-r-----`	`1`	`emu`	`emuadmin`	`60675`	`Nov 7 13:25`	`Ed.250x250.jpg`
`352`	`-rw-r-----`	`1`	`emu`	`emuadmin`	`171163`	`Sep 17 09:37`	`Ed.250x250.pcx`
`256`	`-rw-r-----`	`1`	`emu`	`emuadmin`	`116458`	`Nov 7 13:19`	`Ed.250x250.png`
`1024`	`-rw-r-----`	`1`	`emu`	`emuadmin`	`514797`	`Sep 17 09:25`	`Ed.420x420.lzw.tif`
`1504`	`-rw-r-----`	`1`	`emu`	`emuadmin`	`758494`	`May 18 2001`	`Ed.jpg`
`4`	`-rw-r-----`	`1`	`emu`	`emuadmin`	`2018`	`May 18 2001`	`Ed.thumb.jpg`

In a non-image directory you may see:

`38`	`-rw-r-----`	`1`	`emu`	`emuadmin`	`19456`	`Aug 6 12:39`	`19980529.doc`
`16`	`-rw-r-----`	`1`	`emu`	`emuadmin`	`8035`	`Aug 6 12:39`	`19980529.html`
`38`	`-rw-r-----`	`1`	`emu`	`emuadmin`	`19456`	`Aug 6 12:39`	`19980529.txt`

The media associated with a Multimedia record is determined by what files exist in the directory on the EMu server for the given Multimedia record. Situations may arise when the table in the client does not match the files on the server. The EMu Update Resource facility may be used to rebuild the Resolutions / Documents tables based on the files found on the server. The process involves retrieving all files in the Multimedia records media directory and effectively "adding" them again to an empty list. All properties are calculated and set.

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