在 centralManager:didDiscoverPeripheral:advertisementData:RSSI(下面的完整代码)中，我在 NSDictionary 中找到一个名为 kCBAdvDataServiceUUIDs 的键。我正在尝试读取此数据以确定设备上可用的服务。这些数据是什么格式的？类描述很简单

Unknown (<fff0>)

这是来源:

- (void) centralManager: (CBCentralManager *) central
  didDiscoverPeripheral: (CBPeripheral *) aPeripheral
      advertisementData: (NSDictionary *) advertisementData
                   RSSI: (NSNumber *) RSSI
{
printf("Discovered %s\n", [[aPeripheral name] cStringUsingEncoding: NSUTF8StringEncoding]); // TODO: Remove printfs
    printf("  RSSI: %s\n", [[RSSI stringValue] cStringUsingEncoding: NSUTF8StringEncoding]);
    NSArray *keys = [advertisementData allKeys];
    for (int i = 0; i < [keys count]; ++i) {
        id key = [keys objectAtIndex: i];
        NSString *keyName = (NSString *) key;
        NSObject *value = [advertisementData objectForKey: key];
        if ([value isKindOfClass: [NSArray class]]) {
            printf("   key: %s\n", [keyName cStringUsingEncoding: NSUTF8StringEncoding]);
            NSArray *values = (NSArray *) value;
            for (int j = 0; j < [values count]; ++j) {
                NSObject *aValue = [values objectAtIndex: j];
                printf("       %s\n", [[aValue description] cStringUsingEncoding: NSUTF8StringEncoding]);
                printf("       is NSData: %d\n", [aValue isKindOfClass: [NSData class]]);
            }
        } else {
            const char *valueString = [[value description] cStringUsingEncoding: NSUTF8StringEncoding];
            printf("   key: %s, value: %s\n", [keyName cStringUsingEncoding: NSUTF8StringEncoding], valueString);
        }
    }
}

这是 TI CC2250 迷你开发套件中 key 扣的输出:

Discovered (null)
  RSSI: -36
   key: kCBAdvDataServiceUUIDs
       Unknown (<fff0>)
       is NSData: 0
Discovered SimpleBLEPeripheral
  RSSI: -37
   key: kCBAdvDataServiceUUIDs
       Unknown (<fff0>)
       is NSData: 0
   key: kCBAdvDataLocalName, value: SimpleBLEPeripheral
   key: kCBAdvDataTxPowerLevel, value: 0

最佳答案

经过一番挖掘，这是我的发现:

作为参数传递给 centralManager:didDiscoverPeripheral:advertisementData:RSSI 的广告数据是一个 NSDictionary，它似乎总是包含至少一个名为 kCBAdvDataServiceUUIDs 的键。与此键关联的值是 CBUUID 类型对象的 NSArray。

CBUUID 没有记录在 iOS 5 文档中，尽管它在很多地方都有使用，包括我见过的每个 Apple 蓝牙 LE 示例。它的方法之一是返回 NSData 对象的称为 data 的方法。此 NSData 对象将 UUID 编码为一系列字节。

因此，要获取并在这种情况下查看 BLE 广告的 UUID 中的字节，您可以使用如下代码:

- (void) centralManager: (CBCentralManager *) central
  didDiscoverPeripheral: (CBPeripheral *) aPeripheral
      advertisementData: (NSDictionary *) advertisementData
                   RSSI: (NSNumber *) RSSI
{
    printf("Discovered %s\n", [[aPeripheral name] cStringUsingEncoding: NSUTF8StringEncoding]); // TODO: Remove printfs
    printf("  RSSI: %s\n", [[RSSI stringValue] cStringUsingEncoding: NSUTF8StringEncoding]);
    NSArray *keys = [advertisementData allKeys];
    for (int i = 0; i < [keys count]; ++i) {
        id key = [keys objectAtIndex: i];
        NSString *keyName = (NSString *) key;
        NSObject *value = [advertisementData objectForKey: key];
        if ([value isKindOfClass: [NSArray class]]) {
            printf("   key: %s\n", [keyName cStringUsingEncoding: NSUTF8StringEncoding]);
            NSArray *values = (NSArray *) value;
            for (int j = 0; j < [values count]; ++j) {
                if ([[values objectAtIndex: j] isKindOfClass: [CBUUID class]]) {
                    CBUUID *uuid = [values objectAtIndex: j];
                    NSData *data = uuid.data;
                    printf("      uuid(%d):", j);
                    for (int j = 0; j < data.length; ++j)
                        printf(" %2X", ((UInt8 *) data.bytes)[j]);
                    printf("\n");
                } else {
                    const char *valueString = [[value description] cStringUsingEncoding: NSUTF8StringEncoding];
                    printf("      value(%d): %s\n", j, valueString);
                }
            }
        } else {
            const char *valueString = [[value description] cStringUsingEncoding: NSUTF8StringEncoding];
            printf("   key: %s, value: %s\n", [keyName cStringUsingEncoding: NSUTF8StringEncoding], valueString);
        }
    }
}

关于ios - iOS 蓝牙 LE kCBAdvDataServiceUUID 的格式是什么？，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/11596217/