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++)
return result;

Share : facebook icon twitter icon
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, 
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)  
Related Posts Related Posts :
  • App crashes while converting to Objective-C ARC
  • When updating the TestFlight SDK do you need to delete the old version?
  • How to read file by sector,and not rely on the OS cache in Cocoa
  • Convert from NStimeInterval to CMTime accurately
  • How can I continue my count from the correct spot once I load the saved count?
  • instance method 'connect:' not found (return type defaults to 'id'
  • Does an object initialize automatically if it is the synthesized property of another object?
  • What reasons are there to pass an argument to an initializer in objective C?
  • NSLogging UILabel's text outputs null
  • undefined reference to '__objc_class_name_Fraction'
  • Move UIView above UITableView when user Scrolls Down
  • adding object to nsmutablearray with custom delegate function giving error
  • Cocoa editing NSBezierPath
  • Perform a action on specific time using Parse
  • Objective-C: How to convert json value to BOOL?
  • How to make an int counter for the days
  • Assigning Label Value with Selected Table View Cell
  • SpriteKit - Preloader using GCD
  • Can dependency injection like Typhoon replace multiple singletons?
  • Objective C - How to determine if a folder is a package?
  • How can one draw a background in the elastic portion of an NSScrollView?
  • A solution for my issue with sending some info from an array to Parse
  • Swift Extension fails adding overloaded methods to Objective-C class
  • Determine if key is incorrect with CCCrypt kCCOptionPKCS7Padding-Objective C
  • PQgetResult always returns NULL
  • self.navigationController? is nil when pushing from a objective-c viewController to a Swift ViewController
  • Where to add subViews that I want floating in an NSScrollView using AutoLayout?
  • 'User' in 'User-defined classes'
  • How to get value of a key in NSDictionary?
  • Adding Border Line to UITableView in StoryBoard
  • Mac App Storyboard - Access Document in NSViewController
  • Objective c, reposition a view above the keyboard in one single animation
  • Dismiss modal segue
  • Error message is saying my data is NULL - NSKeyedUnArchiver - I've followed all the steps - still won't work
  • Remove apostrophe in CFStringTransform results
  • Label showing wrong values while NSLog shows the right ones in SpriteKit
  • How to work with locally modified Cocoapod which don't include podspec?
  • What does kCGWindowSharingState actually do?
  • shadow
    Privacy Policy - Terms - Contact Us © ourworld-yourmove.org