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It is possible to copy a CFTypeRef?


It is possible to copy a CFTypeRef?

By : user2949961
Date : November 17 2020, 04:28 AM
it helps some times No, it is not possible to copy a CFTypeRef in the general case.
Typically, it would be up to the caller of such a function to make sure that the keys were not mutated while in the dictionary. (It's not necessarily a problem if a value is mutated. For example, if you had a dictionary mapping from names to Person objects, it would be OK to modify the Person objects by increasing their age or adding a child, etc. If you establish a design requirement that the values not be mutated, then it would again be up to the caller to conform to that requirement.)
code :
CFTypeRef new_keys[count];
for (int i = 0; i < count; i++)
{
    id<NSCopying> temp = (__bridge id<NSCopying>)keys[i];
    temp = [temp copy];
    new_keys[i] = CFBridgingRetain(temp);
}
CFDictionary* result = CFDictionaryCreate(NULL, (const void **)new_keys, (const void **)values, count, &kCFTypeDictionaryKeyCallBacks, &kCFTypeDictionaryValueCallBacks);
for (int i = 0; i < count; i++)
    CFRelease(new_keys[i]);
return result;


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Determining what a CFTypeRef is?

Determining what a CFTypeRef is?


By : Eventyret
Date : March 29 2020, 07:55 AM
Any of those help CFGetTypeID():
code :
if (CFGetTypeID(myObjectRef) == CFStringGetTypeID()) {
  //i haz a string
}
Returning an autorelease'd CFTypeRef with ARC

Returning an autorelease'd CFTypeRef with ARC


By : user3675776
Date : March 29 2020, 07:55 AM
I wish this help you UPDATE
As of OS X 10.9 and iOS 7.0, the public SDK includes a CFAutorelease function.
code :
void cfAutorelease(CFTypeRef *ref) {
    [[(id)ref retain] autorelease];
}
iOS: CFTypeRef disallowed with ARC

iOS: CFTypeRef disallowed with ARC


By : Ankur Maharjan
Date : March 29 2020, 07:55 AM
I wish this help you ARC only manages Objective-C types. If you cast to Core Foundation types you have to tell ARC who owns the variable by using __bridge, __bridge_retained or __bridge_transfer.
Here's Apple's official documentation on toll-free bridging under ARC, or see this blog post (scroll down to Toll-Free Bridging) for a great overview.
code :
NSData *inData = nil;
CFTypeRef inTypeRef = (__bridge CFTypeRef)inData;
OSStatus status = SecItemCopyMatching(
                   (__bridge CFDictionaryRef)searchDictionary, 
                   &inTypeRef);
Getting error using CFTypeRef with ARC

Getting error using CFTypeRef with ARC


By : Tony
Date : March 29 2020, 07:55 AM
I hope this helps . I think you are making unnecessarily complex type casts by trying to cast the pointer-to-pointer argument. How about this:
code :
CFTypeRef result = NULL;
BOOL statusCode = SecItemCopyMatching((__bridge CFDictionaryRef)searchDictionary, &result);
if (statusCode == errSecSuccess) {
    NSData *resultData = CFBridgingRelease(result);
    password = [[NSString alloc] initWithData:resultData encoding:NSUTF8StringEncoding];
}
UnsafeMutablePointer<CFTypeRef> in Swift 3

UnsafeMutablePointer<CFTypeRef> in Swift 3


By : Johan
Date : March 29 2020, 07:55 AM
With these it helps In your case, you do not need to use withMemoryRebound or withUnsafeMutablePointer(to:).
Instead, you can just use
code :
var result: AnyObject?
let status = SecItemCopyMatching(query as CFDictionary, &result)

if status == noErr, let data = result as? Data {
    //use data...
}
var result: AnyObject?  
let status = SecItemCopyMatching(query, &result)  
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