Question by mateiasu · Aug 12, 2013 at 01:34 PM · ios7 4.2 xcode5 ipad mini devicesettings.mm

UnityDeviceUniqueIdentifier() on iOS7

We can't deploy on iOS7 devices due the following issue:

 extern "C" const char*    UnityDeviceUniqueIdentifier()
 {
     QueryDeviceID();
     return [_DeviceID UTF8String]; <-- EXC_BAD_ACCESS (code=1,...)
 }

We already adapted the DeviceSettings.mm like mentioned in this post: 192113-Unity-4-2-Seeing-Crash-on-iOS-Device-when-using-SystemInfo-deviceUniqueIdentifier which solved the issue for < iOS7 devices:

 #if UNITY_PRE_IOS7_TARGET
     static void _InitDeviceIDPreIOS7()
     {
         static const int MD5_DIGEST_LENGTH = 16;
 
         // macaddr: courtesy of FreeBSD hackers email list
         int mib[6] = { CTL_NET, AF_ROUTE, 0, AF_LINK, NET_RT_IFLIST, 0 };
         mib[5] = ::if_nametoindex("en0");
 
         size_t len = 0;
         ::sysctl(mib, 6, NULL, &len, NULL, 0);
 
         char* buf = (char*)::malloc(len);
         ::sysctl(mib, 6, buf, &len, NULL, 0);
 
         sockaddr_dl*   sdl = (sockaddr_dl*)((if_msghdr*)buf + 1);
         unsigned char* mac = (unsigned char*)LLADDR(sdl);
 
         char macaddr_str[18]={0};
         ::sprintf(macaddr_str, "%02X:%02X:%02X:%02X:%02X:%02X", *mac, *(mac+1), *(mac+2), *(mac+3), *(mac+4), *(mac+5));
         ::free(buf);
 
         unsigned char hash_buf[MD5_DIGEST_LENGTH];
         CC_MD5(macaddr_str, sizeof(macaddr_str)-1, hash_buf);
 
         char uid_str[MD5_DIGEST_LENGTH*2 + 1] = {0};
         for(int i = 0 ; i < MD5_DIGEST_LENGTH ; ++i)
             ::sprintf(uid_str + 2*i, "%02x", hash_buf[i]);
 
         // FROM http://forum.unity3d.com/threads/192113-Unity-4-2-Seeing-Crash-on-iOS-Device-when-using-SystemInfo-deviceUniqueIdentifier
         _DeviceID = [[NSString stringWithUTF8String:uid_str] retain];
     }
 #endif

But in this case (we try to build to iOS7) this function shouldn't be called at all. We should get the VendorID instead (which works correctly if target version is set properly ;) ).

 static void QueryDeviceID()
 {
     if(_DeviceID == nil)
     {
     #if UNITY_PRE_IOS7_TARGET
         if(!_ios70orNewer)
             _InitDeviceIDPreIOS7();
     #endif
 
         // first check vendor id
         if(_DeviceID == nil)
         {
             QueryVendorID();
             _DeviceID = _VendorID;
         }
 
         // then ad id if smth went wrong
         if(_DeviceID == nil)
         {
             QueryAdID();
             _DeviceID = _ADID;
         }
     }
 }

Unfortunetly while I breakpointing the execution I see the UUID beeing received by the VendorID but in the end I still get the error. I saw _DeviceID being filled in corretly with a hash like string (I assume that's the UUID) but then its gone again?

Please help :)

Further related post: