On 4/Jan/2010, at 4:24 PM, glenn andreas wrote:
> CFBundle has routines for looking up both functions and data by name. It
> does require you figure out what framework the symbol comes from (and then
> get the corresponding CFBundle), but it is doable.
Cool, I didn't know that CFBundle exposed access to external symbols at run
time! I've always used nm (or some such) to look at the symbol table. This
was a fun exercise to work out how to get access to the value of the symbol at
runtime. Apologies if I've done something weird, I don't work in CF very often.
If you know the bundle identifier, then it would seem that this code will find
the symbol and allow access to its value:
CFBundleRef bundle =
CFBundleGetBundleWithIdentifier(CFSTR("com.apple.AppKit"));
if(bundle){
NSString **pointer = (NSString **)CFBundleGetDataPointerForName
(bundle, CFSTR("NSDeviceResolution"));
if(pointer){
NSLog(@"NSDeviceResolution = %@", *pointer);
}
}
If you don't know the bundle identifier then I assume you have to iterate over
the available bundles (left as an exercise for someone else. ;-)
As to the usefulness of this, I can't say. The original poster never said why
they were trying to do so I don't know if this will be suitable for the task...
Today however, at this moment, it worked for me!
M.
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