Hey guys so I've been trying to convert this objective-c code to swift but keep stumbling on problems with it. Heres the objective-c code:
int msgLength = *((int *) _inputBuffer.bytes);
msgLength = ntohl(msgLength);
and heres what I managed to get:
var msgLength = (inputBuffer.bytes).load(as: Int.self)
msgLength = Int(NSSwapBigLongToHost(UInt(msgLength)))
but this isn't working, it crashes saying there isn't enough bits. I really appreciate the help thanks!
The C int
type is a 32-bit integer (on all current Apple platforms), whereas the Swift Int
is 64-bit integer on 64-bit platforms.
Therefore in Swift you'll have to use UInt32
for 32-bit integers:
var msgLength = (inputBuffer.bytes).load(as: UInt32.self)
msgLength = UInt32(bigEndian: msgLength)
Or, if you switch from NSData
to Data
:
let msgLength = UInt32(bigEndian:inputBuffer.withUnsafeBytes { $0.pointee })
(Even in the C code uint32_t
would be better suited than int
to emphasize that 4 bytes are read.)
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