Hi, I'm no Obj-C developer, but I need to use it when interacting with the Zebra barcode scanner API. I have created a brdging header which works, but I can get this function to return any data. swift func sbtGetAvailableScannersList(_ availableScannersList: AutoreleasingUnsafeMutablePointerNSMutableArray?!) - SBT_RESULT I read on stackoverflow that I can declare it like this: swift var availableScanners: NSMutableArray? scanner?.sbtGetAvailableScannersList(&availableScanners) if let _scanners = availableScanners { for scanner in _scanners { if let scanner = scanner as? SbtScannerInfo { listOfScanners.append(scanner) } } } but the array is always nil. These is a delegate method that fires whenever a scanner get available, and it works, so I know that at least in theory, the array should contain that scanner. This is the Obj-C implementation in the demo.app provided by Zebra Objective-C (void)fillScannersList:(NSMutableArray**)list {     NSMutableArray *available = [[NSMutableArray alloc] init];     NSMutableArray *active = [[NSMutableArray alloc] init];     if (m_DcsSdkApi != nil)     {         if ([m_DcsSdkApi sbtGetAvailableScannersList:&available] == SBT_RESULT_FAILURE)         {             dispatch_async(dispatch_get_main_queue(),                 ^{                     [self showMessageBox:@"Search for available scanners has failed"];                 }             );         }         [m_DcsSdkApi sbtGetActiveScannersList:&active];         /* nrv364: due to auto-reconnect option some available scanners may have          changed to active and thus the same scanner has appeared in two lists */         for (SbtScannerInfo *act in active)         {             for (SbtScannerInfo *av in available)             {                 if ([av getScannerID] == [act getScannerID])                 {                     [available removeObject:av];                     break;                 }             }         }         if ((list != nil) && (*list != nil))         {             [*list removeAllObjects];             [*list addObjectsFromArray:available];             [*list addObjectsFromArray:active];         }     }     [available release];     [active release]; }