81323

Converting Swift Data into Int16

Question:

I have a Java server where I take a short[] and I convert it to a byte[] (Big Endian) and I send it to an iOS device. I am having trouble converting this byte array (or the Data in Swift) into an int16 array ([Int16]). I was also wondering if I was correct in assuming that the Swift equivalent of a Java short type is a Int16 in Swift.

Answer1:

Similarly as in <a href="https://stackoverflow.com/questions/38023838/round-trip-swift-number-types-to-from-data" rel="nofollow">round trip Swift number types to/from Data</a> you can use the withUnsafeBytes method and UnsafeBufferPointer<Int16> to get a view of the data as 16-bit integers. Then use the Int16(bigEndian:) initializer to convert the numbers from big endian to host byteorder. Example:

let data = Data(bytes: [0, 1, 0, 2, 1, 0, 255, 255]) let i16array = data.withUnsafeBytes { UnsafeBufferPointer<Int16>(start: $0, count: data.count/2).map(Int16.init(bigEndian:)) } print(i16array) // [1, 2, 256, -1]

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