TOnDBImageRead procedure type
Specifies an event handler signalled to identify the graphic type for a database image.
Declaration
TOnDBImageRead = procedure(Sender: TObject; S: TStream;
var GraphExt: string) of objectArguments
Sender | Object (TDBImage) instance for the event notification. |
S | Stream instance with the image data examined in the event handler. |
GraphExt | Returns the file extension used for the graphic type, or an empty string when not determined. |
Description
TOnDBImageRead is the type used for the
OnDBImageRead
property in
TDBImage. It provides a mechanism for identifying the
graphic class needed to load image content in the specified stream. In
general, it is used when image data in S contains an additional header that
must be processed / handled prior to reading the raw image data.
See also
An experiment, built from development snapshots. Not the official Free Pascal or Lazarus documentation.