Re: Question about getBytes:length:
Re: Question about getBytes:length:
- Subject: Re: Question about getBytes:length:
- From: Charles Srstka <email@hidden>
- Date: Mon, 23 Nov 2015 23:12:12 -0600
> On Nov 23, 2015, at 11:04 PM, Eric E. Dolecki <email@hidden> wrote:
>
> That method is not my code so I can't speak to it. It's from a github example from a company supplying BT shields for Arduino.
>
> On Mon, Nov 23, 2015 at 11:57 PM Charles Srstka <email@hidden <mailto:email@hidden>> wrote:
>> On Nov 23, 2015, at 9:55 PM, Eric E. Dolecki <email@hidden <mailto:email@hidden>> wrote:
>
>> -(int) compareCBUUIDToInt:(CBUUID *)UUID1 UUID2:(UInt16)UUID2
>> {
>> char b1[16];
>
>> * [UUID1.data getBytes:b1]; //<---*
>
>> UInt16 b2 = [self swap:UUID2];
>> if (memcmp(b1, (char *)&b2, 2) == 0)
>> return 1;
>> else
>> return 0;
>> }
>
>
> Is there a possible typo here? It looks like you’re reading in 16 *bytes* of data, and then comparing it against an integer that is 16 *bits* in size. Is that what you meant to do?
>
> At any rate, you’re only comparing the first two bytes here; the other fourteen will never be used, unless the code above is a simplification.
Can you look at one of the data objects to see if it actually has 16 bytes of data in it?
Charles
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