How to compare 'CBCharacteristic.uuid == "String"' in swift?

Question

How to compare this? uuid and string cant compare

 func charValues()
 {
     let charValue = String(data: getCharacteristic.value!, encoding: 
       String.Encoding.ascii)!
     if getCharacteristic.uuid == "Manufacturer Name String"
     {
        self.lblManufactureName.text = charValue
     }
 }

What are you trying to do? If you want the string representation of the characteristic uuid then `uuidString` is the correct function but this will give you the underlying well-known uuid. There is no way of getting the interpreted value of the well known uuid apart from pulling apart the `description` string. — Paulw11, Jun 22 '17 at 12:19
in CBCharacteristic UUID = Manufacturer Name String , but result is false every time. — Deepak Tagadiya, Jun 22 '17 at 12:25
What do you see if you log `getCharacteristic.uuid.uuidString`? — Paulw11, Jun 22 '17 at 12:27
Then that is the value you will need to look for; unless there are some hidden/unprintable characters there. Assign the value to a variable and check it in the debugger; print the length of the string. — Paulw11, Jun 23 '17 at 05:46
That is the count of the characteristic value. You need to log the length of `getCharacteristic.uuid.uuidString` — Paulw11, Jun 23 '17 at 09:20
Ok, getCharacteristic.uuid = 2A29; there is 4 character in uuid. — Deepak Tagadiya, Jun 23 '17 at 09:46
Let us [continue this discussion in chat](http://chat.stackoverflow.com/rooms/147445/discussion-between-paulw11-and-dc2313). — Paulw11, Jun 23 '17 at 09:47
Sorry, its not work. getCharacteristic.uuid = Manufacturer Name String — Deepak Tagadiya, Jun 23 '17 at 09:48
You can't do anything with `.uuid` in a string context. You have to use `uuid.uuidString` - log this and its length. This is just a string so a string comparison will work. You can also compare `uuid` against `CBUUID(string:"2A29")` — Paulw11, Jun 23 '17 at 09:54

score 6 · Answer 1 · answered Jun 22 '17 at 09:09

6

There’s a uuidString property on CBUUID.

answered Jun 22 '17 at 09:09

zoul

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you are correct, but it is not useful while above function. – Deepak Tagadiya Jun 22 '17 at 09:14
, notifying = NO> – Deepak Tagadiya Jun 22 '17 at 09:14
UUID = Manufacturer Name String, value = 4d455348 54454348 204153; i need to compare UUID to Manufacturer Name String. – Deepak Tagadiya Jun 22 '17 at 09:15
How about `getCharacteristic.uuid.uuidString == "Manufacturer Name String"`? – zoul Jun 22 '17 at 09:22
1

i need to add characteristic value on lblManufactureName.text, so i need to compare uuid and string. – Deepak Tagadiya Jun 22 '17 at 09:27
when i compare getCharacteristic.uuid.uuidString == "Manufacturer Name String" then condition was false. – Deepak Tagadiya Jun 22 '17 at 09:28
Log `characteristic.uuid.uuidString` and then you will have the value that you need to compare in your `if` – Paulw11 Jun 22 '17 at 12:21
"Manufacturer Name String" seems to have has UUID "2A29" according to the following link http://developers-club.com/posts/251937/ , but as mentioned by @Paulw11 log the value or but a break point to get the real value. – Jerome Diaz Jun 22 '17 at 15:54

score 0 · Answer 2 · answered May 01 '18 at 15:03

You need to compare UUID against UUID. Her you compare UUID against name.

CBPeripheral: 0x1c41066f0, identifier = 1CE90EC4-F208-ED69-A4A8-8CF804DDA0D3, name = fxc0c945fc40, state = disconnected

as you can see there is a difference. try comparing name to name or UUIDS

How to compare 'CBCharacteristic.uuid == "String"' in swift?

2 Answers2