GetImageListItemNativeFormat

Images

Description

Classifies the filter chain of one image-list item's original still-encoded PDF stream

Syntax

Delphi

Function GetImageListItemNativeFormat(ImageListID, ImageIndex: Integer): WideString;

Return values

jpeg	The filter chain contains `DCTDecode`
jpx	The filter chain contains `JPXDecode`
jbig2	The filter chain contains `JBIG2Decode`
ccitt	The filter chain contains `CCITTFaxDecode`
flate	The stream uses only `FlateDecode`
raw	The stream has no filter
unknown	The indexed item is invalid, malformed or uses an unclassified filter chain
Empty string	`ImageListID` is not a valid image-list handle

Failure behaviour

The function does not raise an error for an invalid handle or 1-based item index and returns an empty string or unknown as described above

Remarks

The value describes the bytes returned by GetImageListItemNativeDataToString, not a decoded bitmap format. When a filter array contains a recognised compressed image codec, that codec takes precedence over other filters