Moving from GCC 4 to 3.3 is a much larger step for me than moving
from CW to Xcode. I encountered several small issues with code that
used to work but suddenly stopped. Most where easy to get around by
rearranging the code.
Now I'm totally stuck on a problem. I have code that used to work
fine but stopped to work either when I moved from GCC 4 to 3.3 or I
changed some settings in Xcode. Have I been getting away with
something illegal before or is there a problem/setting I missed?
This does not work (key is not found in dictionary):
-------------
#define kMyKey CFSTR("myKey")
You are passing NULL for the key and value callbacks. You should be
using the appropriate standard callback blocks from CFDictionary.h
instead of NULL.
Using NULL has several implications when putting CFTypes into a
dictionary. One is that the dictionary cannot retain/release your
values for you, so you must make sure the values lives longer than
the dictionary. Another side effect of this is that the dictionary
has to use pointer equality tests instead of a logical equals on your
keys, which is why you aren't getting the value back as you expected.
(The implementation reason for this is that CFSTR can make real
static strings, or is a macro that makes a singleton at runtime,
depending on the compiler and settings in use.)
Jim
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