On Do, 2017-01-05 at 11:15 +0100, Mattias Gaertner wrote: > On Tue, 03 Jan 2017 02:54:05 +0100 > Marc Santhoff <m.santh...@web.de> wrote: > > > Hi, > > > > firstly a happy new year to you all and keep on rocking! > > > > While reading the fpimage unit code I found some pieces I don't > > understand and could not clear up reading the docs. Here we go: > > > > <code> > > TFPCustomImage = class(TPersistent) > > [...] > > public > > [...] > > property Extra [const key:string] : string read GetExtra write > > SetExtra; > > property ExtraValue [index:integer] : string read GetExtraValue > > write SetExtraValue; > > property ExtraKey [index:integer] : string read GetExtraKey write > > SetExtraKey; > > procedure RemoveExtra (const key:string); > > function ExtraCount : integer; > > </code> > > > > Whats that good for? Ist to tag images inside my own program or does it > > handle image meta data like EXIF and stuff? > > Yes. Both.
OK, fine. But there is no code doing sth. like reading EXIF tags from files, I have do do myself? I was hoping to find some code handling image comments and the like, still searching for meta data access. ;) > > And at the end: > > > > <code> > > initialization > > ImageHandlers := TImageHandlersManager.Create; > > </code> > > > > Looking at this class it seems to be sort of a type registry, maybe able > > to detect type and name or instantiate the reader and writer classes. > > How ist that to be used and do I need to care for? > > All image formats register themselves there. > It is used by > TFPCustomImage.FindHandlerFromExtension > and > TFPCustomImage.LoadFromStream > > You can query it yourself or use the above. Nice and helpful, thanks. Marc _______________________________________________ fpc-pascal maillist - fpc-pascal@lists.freepascal.org http://lists.freepascal.org/cgi-bin/mailman/listinfo/fpc-pascal
