| Another issue with the garbage collector? [message #73489] |
Thu, 11 November 2010 08:29 |
Bubba
Messages: 3
Registered: October 2010
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Junior Member |
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I am having an issue with the garbage collector once again. I have an
"image" object that contains a pointer to a two dimensional data
array. It has two pretty simple functions, crop and get. The crop
function crops the data and then returns another instance of the image
class with the cropped data. The get function simply returns the two
dimensional data array. If I try to call the crop function and the
get function all in one line, it appears as thought the garbage
collector cleans up my new image object before it gets to calling the
get function. Here is an example...
; Image class definition
function myImage::init, pixelData
compile_opt idl2, logical_predicate
;store image data
self.pixelData = ptr_new(pixelData, /NO_COPY)
return, 1
end
pro myImage::cleanup
compile_opt idl2, logical_predicate
if ptr_valid(self.pixelData) then ptr_free, self.pixelData
end
function myImage::cropOutImage, bottomLeftX, bottomLeftY,
suggestedWidth, suggestedHeight
compile_opt idl2, logical_predicate
;get resized pixel data
oldData = self.pixelData
newData = ptr_new((*oldData)[bottomLeftX: bottomLeftX +
suggestedWidth - 1, $
bottomLeftY: bottomLeftY +
suggestedHeight - 1])
;create the new image
newImage = obj_new('myImage', *newData)
ptr_free, newData
return, newImage
end
function myImage::getPixelData
compile_opt idl2, logical_predicate
return, ptr_valid(self.pixelData) ? *self.pixelData : -1
end
pro myImage__define
compile_opt idl2, logical_predicate
define = {myImage, pixelData: ptr_new()}
end
; test code
pro testGarbageCollector_Objects
compile_opt idl2, logical_predicate
data = findgen(200,100)
workingImage = obj_new('myImage', data)
newImage = workingImage->cropoutimage(0, 0, 10, 3)
print, newImage->getPixelData() ; Prints the expected 10 x 3 array
print, (workingImage->cropoutimage(0, 0, 10, 3))->getPixelData() ;
Crashes with an undefined variable
end
I thought this was fixed in IDL 8.0.1, am I missing something?
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