Michael Heiser wrote:

> Could it be that the is, that my picUpdate() function is in another class
> then my callback which calls picUpdate()?

No, I don't think so. If it is called *correctly*, the class doesn't matter.

> I have created the forms with fluid. A Mainwindow that inherits a group with
> 6 buttons and the picbox.
> Then I created a Dialog class where all my callbacks are. The callbacks call
> functions form a PicHandle_Class where I do the picUpdate for Example. The
> Dialog Class is derived from the class generated from fluid and also the
> PicHandleClass. I will post my .h files to show you what I mean.

Unfortunately your .h files are not very helpful.

Did you try my example with your FLTK version? Did it work?

> Any hints?

Only one: look for local/automatic variables in your functions
(callbacks) that might go out of scope at the end of the
function. That might be a problem somewhere. However, in your
posted code fragments, you allocated the image with new and
used [your box]->image(jpg) or similar, and that would be
okay. Sorry, no more ideas other than that ...

Albrecht
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