| Re: Another issue with the garbage collector? [message #73470] |
Thu, 11 November 2010 16:20 |
chris_torrence@NOSPAM
Messages: 528
Registered: March 2007
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Senior Member |
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Hi,
This is a bit different than the problem that was fixed in IDL 8.0.1.
In the other bug (CR60104 - IDL 8.0 fails to dereference unnamed
pointer expressions), it was a much simpler case:
print, *(ptr_new(5))
In your case, you are returning a pointer expression from an object
that is about to be destroyed. To see this, if you put a breakpoint in
your ::cleanup method, when the cleanup gets called, it is right on
the "return" in ::getPixelData. So the self.pixelData gets freed
during the "return".
I will go ahead and log this bug. In the meantime, I found a
workaround. In your ::getPixelData, just put the result into another
variable, like this:
function myImage::getPixelData
compile_opt idl2, logical_predicate
result = ptr_valid(self.pixelData) ? *self.pixelData : -1
return, result
end
That way, when the self.pixelData gets whacked, you've got a "safe"
copy in the return value.
As an aside, in your ::cropOutImage, why are you creating the
"newData" pointer, only to free it a couple of lines later? I don't
think this is actually saving any memory (unless this is just a code
snippet).
Hope this helps.
Cheers,
Chris
ITTVIS
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