Re: [Lazarus] External: SIGSEGV

[Jon Foster]

SIGSEGV (otherwise known as a segfault) is a *nix signal indicating that the an illegal address was accessed. Normally it can't be caught with a try...except. You have to muck about with signals to catch it with try ... except. It some times can be difficult to determine the exact location of the error. I usually use WriteLn() to print debugging info but the signal can abort a program before flushing buffers so I have to verify it by selectively remming out code or issuing flush() after each writeln(). In the latter case it easiest to create and use a logging function. Looking at the suspect code I have to say that assigning a nil to another variable is not a segfault condition. It would be a problem if you tried to use MyObject2_var when it is a nil or if MyObject1 is nil. You can not access object members, if the object is nil, without causing this condition. Hope this helps. -Jon [EMAIL PROTECTED] wrote: Hi,     I have tried to google for "External: SIGSEGV" exception, but nothing what came up helped.   Is there any detailed explanation about when this exception occurs?   In my program it  pops up when reading an unassigned (nil) object property:     MyObject2_Var:= MyObject1.MyObject2;   (MyObject1.MyObject2 is nil)   The strange thing is that the assignment is in a try ... except block, and the debugger does not stop at the breakpoints in the exception  handling part.   I am totally clueless.   Thanks for reading     - Leslie -   _______________________________________________ Lazarus mailing list Lazarus@lazarus.freepascal.org http://www.lazarus.freepascal.org/mailman/listinfo/lazarus -- Jon Foster JF Possibilities, Inc. [EMAIL PROTECTED] 541-410-2760 Making computers work for you!

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