Hi all,

I'm encountering a consistent crash, and I'm not sure how to address the problem.

using:
- laz 0.9.28.2-8 beta, svn 22277, from debian testing -- a rather outdated one, because at this point upgrading lazarus requires updating debian
- fpc 2.4.0-2 [2010/02/20] for i386
- fpgui commit e01c52a650bfdcce0bb1c8bbceefeb4e8dd46764

The lazarus popup error message says:

Project Swindow raised exception class 'External: SIGSEGV'.

The top of the lazarus call stack shows:

#0 :00000000 ?? at :0
#1 :08058BC2 SYSTEM_TOBJECT_$__FREE at :0

#2 is my own call: if assigned (f_image) then f_image.free;

I broke up the line, and it's crashing on the "then f_image.free" part, rather than on the "if assigned(f_image)" part.

Any ideas?

Thanks,
David

Hi!

outdated

Have you initialized f_image? If not, do f_image := nil; and the error will be gone. (Assigned need this to check if the object exists) You could also use if assigned (f_image) then FreeAndNil(f_image); Hope this works!
Matthias Klumpp

Thanks Matthias, FreeAndNil solved my problem! I was assuming that calling Free would also nil out the variable holding the reference to the object, but obviously it does not.

Cheers,
David