What encoding is the device token for APNs in?

Is it possible to get the Device Token returned from the application:(UIApplication *)application didRegisterForRemoteNotificationsWithDeviceToken:(NSData *)deviceT开发者_如何学Coken method? Since I'm not very good at PHP, I'd like for my user to manually enter the token into a program on their computer that is going to be used to send out the notification. But, I can't get the token from this method. It logs fine using NSLog, but when I use NSString initWithData:, I always get some cryptic thing. I suppose the encoding is wrong?

Thanks for your help in advance!

The token is an NSData object, which points to a raw binary blob of data, not a string. The two most common ways to convert it to a string would be:

1. base64 encode it Download http://projectswithlove.com/projects/NSData_Base64.zip

NSString *str = [deviceToken base64EncodedStringWithoutNewlines];

2. Use NSData's -description to get a string hex dump and clean it up

NSString *str = [[deviceToken description] stringByReplacingOccurrencesOfString:@"<" withString:@""];
str = [str stringByReplacingOccurrencesOfString:@">" withString:@""];
str = [str stringByReplacingOccurrencesOfString: @" " withString: @""];

I prefer #1 because the latter is dependent on the internal way that NSData's -description call works, but either should work.

You can get the hexadecimal string without worrying about the behaviour of NSData's description method, with:

+ (NSString *)hexadecimalStringFromData:(NSData *)data {
    NSMutableString *hexToken;
    const unsigned char *iterator = (const unsigned char *) [data bytes];
    if (iterator) {
        hexToken = [[NSMutableString alloc] init];
        for (NSInteger i = 0; i < data.length; i++) {
            [hexToken appendString:[NSString stringWithFormat:@"%02lx", (unsigned long) iterator[i]]];
        }
        return hexToken;
    }
    return nil;
}

Token is NSData.You can convert to string.And remove < and > and spaces

NSString *devToken = [[deviceToken description] stringByTrimmingCharactersInSet:[NSCharacterSet characterSetWithCharactersInString:@"<>"]];
devToken = [devToken stringByReplacingOccurrencesOfString:@" " withString:@""];


NSLog(@"token: %@",devToken);