Hi all --
Just wanted to let you know that there is a bug in the ilk() function
in Director 10.1.1 (ONLY in 10.1.1, not in 10.1). When you do an ilk
(imageObject, #image) on an image object, it returns #image instead
of returning 1 as it should. For example:
put ilk((the stage).image, #image) -- should return 1, returns the
symbol #image instead
put (the stage).image.ilk(#image) -- ditto
put ilk((the stage).image, #object) -- this also returns #image
instead of returning 1
put ilk((the stage).image, #proplist) -- uh oh, this also returns
#image instead of 0
The bug happens in both Mac and Windows, in both projector and
authoring mode. It's a problem because the statement:
if ilk(myImage, #image) then alert "myImage is an image!"
will throw up a script error; the "if" statement expects an integer,
not a symbol like #image. The workaround is to add zero to the
function, so that the same code will continue to work even if this
bug is fixed:
if (ilk( myImage, #image ) + 0) then alert "myImage is an image!"
if myImage is an image object ( myImage.ilk(#image) + 0 ) evaluates
to 1 in Dir 10.1, and to some large nonzero integer in Dir 10.1.1
(you can try this out in the message window). If myImage is not an
image, both versions of Director return 0 as expected, so adding zero
has no effect.
Unfortunately, a larger problem is the fact that, when myImage is an
image object, ilk(myImage, type) with any other type -- be it #void,
#loc, #list, #member, #date, whatever -- will STILL return #image.
You either need to be extremely careful that you never let an object
of #image type be tested in an ilk(thing, type) function, otherwise
you need to code it to specifically check that the integer 1 is
returned:
if ( ilk(thingToTest, #proplist) = 1 ) then alert "thingToTest is a
proplist!" -- use this code when testing for any type OTHER than #image
if ( ilk( thingToTest, #image ) + 0 ) then alert "thingToTest is an
image!" -- use this code ONLY when testing for type #image
All other ilk types seem to return 1 or 0 as expected in 10.1.1,
#image is the only anomaly. Interestingly, even ilk(member
(1).picture, #picture) returns 1 as expected.
I've submitted a bug report to Macromedia.
cheers,
jamie ciocco
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