2
我想将通过蓝牙连接获得的类型为NSData的6字节十六进制转换为适当的整数值。我知道这是Big Endian类型,我需要共同小Endian。然而,每一次我尝试将其转换时间,我可以提取正确的数据,但结果一看不对,请参见下面的操场代码:试图将类型(BigEndian)的NSData从BlueTooth转换为Swift类型的Little Endian的Int
var newdata = NSData(bytes: [0x26, 0x01, 0x45, 0x01, 0x04, 0x5e, ] as [UInt8], length:6)
//var timeData = newdata.subdataWithRange(NSMakeRange(4,2))
//var heelData = newdata.subdataWithRange(NSMakeRange(2,2))
//var frontData = newdata.subdataWithRange(NSMakeRange(0,2))
var timeData:UInt16 = 0
var heelData:UInt16 = 0
var frontData:UInt16 = 0
//var timeData = data.subdataWithRange(NSMakeRange(4,2))
var timeIn: NSNumber = NSNumber(unsignedShort: 0)
newdata.getBytes(&timeIn, range: NSRange(location: 4,length: 2))
timeData = CFSwapInt16BigToHost(timeIn.unsignedShortValue)
//24068
var heelIn: NSNumber = NSNumber(unsignedShort: 0)
newdata.getBytes(&heelIn, range: NSRange(location: 2, length: 2))
heelData = CFSwapInt16BigToHost(heelIn.unsignedShortValue)
//325
var frontIn: NSNumber = NSNumber(unsignedShort: 0)
newdata.getBytes(&frontIn, range: NSRange(location: 0, length: 2))
frontData = CFSwapInt16BigToHost(frontIn.unsignedShortValue)
//294