Objective C- BLE device Manufacturers data comparison

问题

I have a task of comparing Manufacturers data to a string to display the BLE devices .

-(void)centralManager:(CBCentralManager *):didDiscoverPeripheral:(CBPeripheral *)peripheral advertisementData:(NSDictionary *)advertisementData RSSI:(NSNumber *)RSSI
{
    NSString *manufac=[advertisementData objectForKey:CBAdvertisementDataManufacturerDataKey];
    NSString *string=@"57394423 4334445 55";
    if([string isEqualToString:manufac])
       NSLog(@"yes it is the device");
    else
       NSLog(@"sorry not a device");
}

'manufac' when printed gives result as <57394423 4334445 55> which doesnot prove to be correct at any time. How can it be compared ? please help.

回答1:

The object returned by the CBAdvertisementDataManufacturerDataKey is an NSData object. You are assigning it to an NSString object which is wrong.

To get the UUID you could do the following:

NSData *manufacturer = [advertisementData objectForKey:CBAdvertisementDataManufacturerDataKey];
NSUUID *uuid = [[NSUUID alloc] initWithUUIDBytes:manufacturer.bytes];

And then compare this UUID to the one you are searching for. If you need an actual NSString representation, use uuid.UUIDString.

来源：https://stackoverflow.com/questions/34942484/objective-c-ble-device-manufacturers-data-comparison