bluetooth lowenergy - BTLE Corebluetooth iOS Transfer an array -

i playing apple sample code btle_transfer https://developer.apple.com/library/ios/samplecode/btle_transfer/introduction/intro.html in sample, ios device "a" sends ios device "b" "text" (nsstring) when b (central) subscribe characteristic of "a" (peripheral). (the data cut in pieces sent piece until received on other side)

i modified code transfer image using uiimagejpegrepresentation method , working fine (but takes long when size of image on 2 ko)

now try transfer array of different objects text, image.

i have tried code below in didsubscribetocharacteristic method (peripheral manager side):

nsarray *myarray; myarray = [[nsarray alloc]initwithobjects:@"text1", @"text2", nil]; _datatosend = [nskeyedarchiver archiveddatawithrootobject:myarray]; 

where _datatosend nsdata sent

and code below in didupdatevalueforcharacteristic method (central side - peripheral delegate):

nsarray *my2array = [nskeyedunarchiver unarchiveobjectwithdata:_datareceived]; nslog(@"%@",[my2array objectatindex:1]); 

where _datareceived nsdata received

each piece received on central side parts "null" , when try unarchive data nsarray, says data null.

am using wrong method? there other way put nsarray nsdata?

thank help

jimmy

the code working...i retype ground sorry bothering