放下&
on &bytes
. bytes
是一个数组。
var bytes:Array<UInt8> = [0x9A, 0x99, 0x99, 0x41] //19.20000
var f:Float = 0.0
memccpy(&f, bytes, 4, 4) // as per OP. memcpy(&f, bytes, 4) preferred
println ("f=\(f)")// f=19.2000007629395
更新 Swift 3
memccpy
似乎在 Swift 3 中不起作用。正如评论者所说,使用memcpy
:
import Foundation
var bytes:Array<UInt8> = [0x9A, 0x99, 0x99, 0x41] //19.20000
var f:Float = 0.0
/* Not in Swift 3
memccpy(&f, bytes, 4, 4) // as per OP.
print("f=\(f)")// f=19.2
*/
memcpy(&f, bytes, 4) /
print("f=\(f)")// f=19.2