How to use UnsafeMutablePointer in Swift 3?

Question

I have the following code written in Swift 2.2:

let keyData = NSMutableData(length: 64)!
SecRandomCopyBytes(kSecRandomDefault, 64, UnsafeMutablePointer<UInt8>(keyData.mutableBytes))

XCode 8 highlights that second line and claims that

Cannot invoke initializer for type 'UnsafeMutablePointer<_>' with an argument list of type '(UnsafeMutableRawPointer)'

While I appreciate XCode telling me this, I don't quite understand how to change the UnsafeMutableRawPointer to be acceptable.

Does anyone know how to convert this code into Swift 3?

To avoid duplicates, this is my question, very similar with yours. Hope someone can answer my question together with yours. `Cannot invoke initializer for type 'UnsafePointer<_>' with an argument list of type '(UnsafeMutableRawPointer?)'` — JW.ZG, Sep 16 '16 at 20:04
Other than OOper's answer, nope. Do you have to use NSMutableData in your case? — AppreciateIt, Sep 16 '16 at 20:19
Try this [solution](http://stackoverflow.com/questions/10658553/how-to-get-pixel-color-at-location-from-uiimage-scaled-within-a-uiimageview). I just solved my problem with this solution. — JW.ZG, Sep 16 '16 at 20:31

score 18 · Accepted Answer · answered Sep 15 '16 at 16:09

18

I recommend you to work with Data rather than NSData in Swift 3.

var keyData = Data(count: 64)
let result = keyData.withUnsafeMutableBytes {mutableBytes in
    SecRandomCopyBytes(kSecRandomDefault, keyData.count, mutableBytes)
}

withUnsafeMutableBytes(_:) is declared as a generic method, so, in simple cases such as this, you can use it without specifying element type.

answered Sep 15 '16 at 16:09

OOPer

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please see this https://stackoverflow.com/questions/45181614/cannot-invoke-initializer-for-type-unsafepointer-with-an-argument-list-of-typ – Saurabh Jain Jul 19 '17 at 05:30

How to use UnsafeMutablePointer in Swift 3?

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