..InfoThumbnailGeneration is used to find out whether the thumbnails of an item have been successfully generated.
This item was defined in the data model editor or by programming.
Note: The HFSQL thumbnails of an item are automatically generated:
Versions 17 and later
New in version 17Versions 18 and later New in version 18 Remark: From version 19, HFSQL is the new name of HyperFileSQL.
Versions 21 and later New in version 21
// Generate the first thumbnail for the description of the Photo item?
InfoGene is string
InfoGene = Product.Photo..InfoThumbnailGeneration[1]
// equivalent to InfoGene = Photo..InfoThumbnailGeneration
// Generate the Nth thumbnail of the Product.Image item?
InfoGene is string
InfoGene = Product.Image..InfoThumbnailGeneration[num]
IF InfoGene = "" THEN
// Thumbnail number greater than the number of described thumbnails?
IF num > Product.Image..NbDescribedThumbnail THEN
Error("This thumbnail does not exist")
ELSE
Info("The thumbnail was successfully generated")
END
ELSE
// Generation error
Error("Generation error", InfoGene)
END
Syntax
<Generation information> = <File name>.<Item name>..InfoThumbnailGeneration[<N>]
<Generation information>: Character string
- Empty string ("") if the specified thumbnail was successfully generated,
- Error message otherwise.
An empty string ("") is also returned:
- if <N> is greater than the number of thumbnails described for the item. To find out the number of thumbnails described for a given item, use ..NbDescribedThumbnail.
- if the current record was written by a Hyper File 9 (or earlier) engine (see the Notes).
<File name>: Character string (with or without quotes)
Name of data file used. This name was defined in the data model editor or by the File description type.
<Item name>: Character string (with or without quotes)
Name of binary memo item used. This name was defined in the data model editor or by the Item description type.
<N>: Optional integer
Number of the thumbnail used. If this parameter is not specified, the generation information of the first thumbnail is returned.
Remarks
..InfoThumbnailGeneration is available:
- in HFSQL Classic and in HFSQL Mobile: for the items found in a data file, in a view or in a query.
- in HFSQL Client/Server: for the items found in a data file only.
The Hyper File thumbnails are not available in version 9 or earlier. Therefore, the records written by a Hyper File 9 (or earlier) engine cannot contain any Hyper File thumbnails.
The table below presents the use of binary memos and thumbnails in an application developed in version 9 (or earlier) and in an application developed in a later version that is using the same data files:
| | |
| Application (or site) in version 9 or earlier | Application (or site) in version 10 or later |
|---|
| New record written by a Hyper File 9 (or earlier) engine | Image displayed: Binary Memo | Image displayed: Binary Memo |
| New record written by a Hyper File 10 engine | Image displayed: Binary Memo | Image displayed: Thumbnail |
| Record written by a Hyper File 9 (or earlier) engine and modified in version 10 (the value of the binary memo item is modified) | Image displayed: Binary Memo | Image displayed: Thumbnail |