On 30.06.2022 16:54, Werner Pamler via lazarus wrote:
Am 30.06.2022 um 15:11 schrieb Mattias Gaertner via lazarus:
Maybe instead of the GraphicClass.ClassName the first extension can be
written.
That means, that an old IDE cannot read the graphic.
This will break Delphi compatibility, i.e. forms with an image in
which the Picture has been loaded by Delphi will not be readable by
Lazarus any more, and vice versa. Just checked again the signature
that Delphi writes to the begin of the Picture.Data: it's the class
name, not the extension.
And what about writing the extension to the data end?
Picture.Data = {
0B 54 49 6D 61 67 69 6E 67 50 4E 47 89 50 4E 47 0D 0A 1A 0A 00 00
00 0D 49 48 44 52 00 00 01 C6
11 T I m a g i n g P N G // 11 is the
length byte
03 p n g
That should be both Delphi and legacy Lazarus compatible if the reader
reads only the defined count of bytes for the classname?
Newer Lazarus versions would first search the extension and if not found
they search for the classname.
Ondrej
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