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 On Thu 9 Dec 2010, Matthias Klumpp wrote: > Hi! > On Thu, 9 Dec 2010 11:42:20 -0800, David Emerson <dle...@angelbase.com> > wrote: > > 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 outdated 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? > 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 > > > _______________________________________________ > fpc-pascal maillist - fpc-pascal@lists.freepascal.org > http://lists.freepascal.org/mailman/listinfo/fpc-pascal > _______________________________________________ fpc-pascal maillist - fpc-pascal@lists.freepascal.org http://lists.freepascal.org/mailman/listinfo/fpc-pascal
