InfoThumbnailGeneration (Property)

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InfoThumbnailGeneration (Property)

In french: InfoGénérationVignette

Available only with these kinds of connection

The InfoThumbnailGeneration property is used to determine if the thumbnails of an item have been generated successfully.

This item was defined in the data model editor or programmatically.

Remark: HFSQL thumbnails of a heading are generated automatically when:

writing the corresponding record (HAdd or HWrite),
changing the value of the item (HModify),
automatic modification of data files.

Example

// 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 expected number of 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> = <Data file>.<item>.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 get the number of thumbnails in a given item, use the NbDescribedThumbnail property.
if the current record was written by a Hyper File 9 (or earlier) engine (see the Notes).

<Data file>: Character string

Name of the data file used. This name was defined in the data model editor or with the File Description type.

<Item>: Character string

Name of binary memo item used. This name was defined in the data model editor or with 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

Limitation

The InfoThumbnailGeneration property is available:

in HFSQL Classic: on the fields of a data file, view or query.
in HFSQL Client/Server: on data file fields only.

The InfoThumbnailGeneration property is only available on data file items in HFSQL Client/Server.