Convert NSInlineData to Nstring in ios

Question

i am trying to get a substring from a parent string. parent string is mac address of device available in a dictionary. But when i try to convert it it si giving me error as below "[_NSInlineData substringFromIndex:]: unrecognized selector sent to instance".

I just want to remove some of the chars from the parent string (here it is mac address like "<0001ui3 234563>" ) and get "ui3 234563".

   // This is my nsdictionary.
  advertisementdata = {     kCBAdvDataIsConnectable = 1;     kCBAdvDataLocalName = "test123";     kCBAdvDataManufacturerData = <00029r21 6y051rt2>;     kCBAdvDataServiceUUIDs =     (         FFF0     );     kCBAdvDataTxPowerLevel = 0; }

 // I want 9r216y051rt from kCBAdvDataManufacturerData;
 NSString *str2;


 str2=[advertisementData objectForKey:@"kCBAdvDataManufacturerData"];

 NSString *str3;
 str3=[str2 substringFromIndex:5];

 // here I do not get the required 12 character string from str2 string.

 get NSInlinedata error for all NSString method.

Thanks,

What you're trying to reference is not an NSString but rather an NSData object. — Hot Licks, Oct 29 '14 at 16:59
Please check my new code for this. I am getting empty value in variable "macstring" with this new code. — Purushottam zende, Oct 29 '14 at 17:15
`data2` contains data and that data is not an encoded string. What are you actually trying to do with the data in `data2`? Where did that data come from? — rmaddy, Oct 29 '14 at 17:17

score 2 · Answer 1 · answered Apr 30 '15 at 20:18

Note that iOS CoreBlueTooth advertisementData is binary NSData:

https://developer.apple.com/library/ios/documentation/CoreBluetooth/Reference/CBCentralManagerDelegate_Protocol/index.html#//apple_ref/doc/constant_group/Advertisement_Data_Retrieval_Keys

Documentation clearly states:

CBAdvertisementDataManufacturerDataKey
A NSData object containing the manufacturer data of a peripheral.

BTW, when you have a NSDictionary value type NSData*, you get the error by casting this NSData into a NSString*

// this is a bug!

NSString* str2=[advertisementData objectForKey:@"kCBAdvDataManufacturerData"];

To inspect the dictionary value try

NSData* advData = [advertisementData objectForKey:@"kCBAdvDataManufacturerData"];

Unfortunately, since this is binary, you need to interpret it according to the peripheral manufacturer data documentation. There is no easy way to transform this into a NSString*

score 1 · Answer 2 · answered Oct 29 '14 at 16:56

1

Sounds like you have an NSData object, and you're trying to use an NSString method to access it. You can convert your NSData object using the callinitWithData: encoding: Then apply the substringFromIndex call to your new NSString.

answered Oct 29 '14 at 16:56

Owen Hartnett

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Yes, i tried that (please check my new code) , but in my variable "macaddress" is giving empty. – Purushottam zende Oct 29 '14 at 17:06
In your code above, you have kCBAdvDataManufacturerData = <00029r21 6y051rt2>, it should be kCBAdvDataManufacturerData = @"<00029r21 6y051rt2>" – Owen Hartnett Oct 29 '14 at 18:50
I am not creating it. I printed what i saw in console. Its actually coming from search functionality of Hardware Bluetooth devices. I have lots of them. – Purushottam zende Oct 30 '14 at 04:37
OK, let's consider that it's NSData. In that case, change NSString *str2; to NSData * str2; Then change NSString * str3; to NSString * str3 = [[NSString alloc] initWithData: str2 encoding: NSUTF8StringEncoding]; Then do NSString * str4 = [str3 substringFromIndex:5]; Does that make it work? – Owen Hartnett Oct 30 '14 at 17:56

score 0 · Answer 3 · answered Oct 09 '18 at 08:17

The point that you have NSInlineData and what you need is hexadecimal representation of data object.

First step should be to get a hexadecimal representation of data object's content in property list format.

 NSData *datakCBAdvDataManufacturerData = [advertisementData valueForKey:@"kCBAdvDataManufacturerData"];
 NSString *strmanufacturerData      = datakCBAdvDataManufacturerData.description;
 NSString *ChkStr = [strmanufacturerData substringWithRange:NSMakeRange(10, 8)];//depends upon your requirement.
 NSLog(@"%@",ChkStr);

 unsigned int outVal;
 NSScanner* scanner = [NSScanner scannerWithString:ChkStr];
 [scanner scanHexInt:&outVal];
 NSLog(@"%@",outVal);

This outVal variable will contain value what you need.

Convert NSInlineData to Nstring in ios

3 Answers3

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