How to get bytes out of an UnsafeMutableRawPointer?

Question

How does one access bytes (or Int16\'s, floats, etc.) out of memory pointed to by an UnsafeMutableRawPointer (new in Swift 3) handed to a Swift function by a C API (Core Aud

Answer 1

Create Data object.

init(bytesNoCopy bytes: UnsafeMutableRawPointer, count: Int, deallocator: Data.Deallocator)

One important way missing from the other answers here is initialising a Data object with UnsafeMutableRawPointer. The data object can then be used for other calculations.

public func base64(quality: Int32 = 67) -> String? {
    var size: Int32 = 0
    if let image = gdImageJpegPtr(internalImage, &size, quality) {
        // gdImageJpegPtr returns an UnsafeMutableRawPointer that is converted to a Data object
        let d = Data(bytesNoCopy: image, count: Int(size), deallocator: .none)
        return d.base64EncodedString()
    }
    return nil
}