Convert Objective-C code to Swift

Question

I have been working with nrf51x. I have a sample code written in Obj-C. I was not able to convert it to Swift.

uint8_t value = ACTIVATE_AND_RESET_REQUEST;
[self.bluetoothPeripheral writeValue:[NSData dataWithBytes:&value length:sizeof(value)] forCharacteristic:self.dfuControlPointCharacteristic type:CBCharacteristicWriteWithResponse];

I tried

var value: UInt8 = DfuOperations.VALIDATE_FIRMWARE_REQUEST.rawValue
let ptr = UnsafePointer<Void>(value)
let data = NSData(ptr, length: sizeofValue(value))
dfuPeripheral!.writeValue(data, forCharacteristic: self.dfuControlPointCharacteristic, type: CBCharacteristicWriteType.WithResponse)

and this one

var value: UInt8 = DfuOperations.VALIDATE_FIRMWARE_REQUEST.rawValue
let data = NSData(&value, length: sizeofValue(value))

Can any one help me? Thank you very much

Check out the link provided in this [answer](http://stackoverflow.com/a/33564737/5222077) — kye, Nov 06 '15 at 12:53
What exactly is not working in your code? What is the error? — Sulthan, Nov 07 '15 at 19:05

Verticon · Answer 1 · 2015-11-09T10:29:44.807

0

The class below builds without error. I am using Xcode 7.1.

import Foundation
import CoreBluetooth

class Test {
    func test(bluetoothPeripheral: CBPeripheral, dfuControlPointCharacteristic: CBCharacteristic) {
        let value = UInt8(ACTIVATE_AND_RESET_REQUEST.rawValue)
        let encodedValue = NSData(bytes: [value], length: sizeof(UInt8))
        bluetoothPeripheral.writeValue(encodedValue, forCharacteristic: dfuControlPointCharacteristic, type: CBCharacteristicWriteType.WithResponse)
    }
}

edited Nov 09 '15 at 10:29

answered Nov 07 '15 at 17:14

Verticon

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Why you are using `UInt32` when the original code is using `UInt8`? – Sulthan Nov 07 '15 at 19:04
Thanks @RobertVaessen – Zied Feki Nov 11 '15 at 11:49

score 0 · Accepted Answer · answered Nov 11 '15 at 11:48

Thanks to @Robert answer I was able to find a solution. I finally created a method that writes an array of [UInt8] to a CBCharacteristic. Here is the code:

func updateValueForCharacteristic(characteristic: CBCharacteristic, value: [UInt8], writeType: CBCharacteristicWriteType = CBCharacteristicWriteType.WithResponse){
    let data = NSData(bytes: value, length: sizeofValue(value))
    dfuPeripheral!.writeValue(data, forCharacteristic: characteristic, type: writeType)
}

Convert Objective-C code to Swift

2 Answers2