Mac Forum / Programming / Mac Programming / August 2005

I took this code verbatim out of the CFPreferences docs:

int dropMethod = 0;
CFStringRef dropMethodKey = CFSTR("dropMethod");
CFNumberRef dropMethodVal = CFPreferencesCopyAppValue(dropMethodKey,
kCFPreferencesCurrentApplication);
if (dropMethodVal)
{
    if (!CFNumberGetValue(dropMethodVal, kCFNumberIntType,
&dropMethod))
        dropMethod = 0;
    CFRelease(dropMethodVal);
}
else dropMethod = 0;

I get a warning on the third line (assignment to dropMethodVal).  The
warning is:

Invalid conversion from 'const void*' to 'const __CFNumber*'

Like I said, this is practically verbatim from the dos.  The application
runs fine.  It saves and retrieves preferences without any trouble after
multiple app launches.   I just don't understand why I'm getting warning
for code from the docs.  Is it actually wrong?  Should I just put a cast
in front of it to get rid of the warning even thought the docs didn't use
a cast?

Thanks.

________________________________________________________________________
Keith Wiley         kwiley@cs.unm.edu         http://www.unm.edu/~keithw

"Yet mark his perfect self-contentment, and hence learn his lesson,
that to be self-contented is to be vile and ignorant, and that to
aspire is better than to be blindly and impotently happy."
                                           --  Edwin A. Abbott, Flatland
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