IOKit和获取唯一ID

Question

我正在使用: IOServiceGetMatchingServices

kr = IOServiceGetMatchingServices(kIOMasterPortDefault,
IOServiceNameMatching("AppleUSBEHCI"), &io_objects);

我正在寻找我如何找到有关内部硬盘的信息，因为以上将探测USB设备。

我似乎找不到一个列表或任何可以告诉我这一点的东西。

本质上，我正在寻找一种从系统中获得唯一ID的方法。在Windows上，其他开发人员使用硬盘id。

有人能解释一下这些价值观吗？

Answer 1

在命令行上，您可以使用ioreg工具浏览IO工具包注册表。对于Lion或更早的版本，您还可以使用苹果硬件IO工具包中方便的IORegistryExplorer图形用户界面工具。(它在Mountain Lion上坠毁)

对于查看内部硬盘驱动器属性，这是一个很好的开始：

ioreg -irc IOAHCIBlockStorageDevice -w 0

在我的MacBook Air上产生了以下结果：

+-o IOAHCIBlockStorageDevice  <class IORegistryEntry:IOService:IOBlockStorageDevice:IOAHCIBlockStorageDevice, id 0x100000216, registered, matched, active, busy 0 (472 ms), retain 7>
  | {
  |   "IOCFPlugInTypes" = {"24514B7A-2804-11D6-8A02-003065704866"="SMARTLib.plugin"}
  |   "device-type" = "Generic"
  |   "IOStorageFeatures" = {"Unmap"=Yes}
  |   "Device Characteristics" = {"Logical Block Size"=512,"Product Name"="APPLE SSD TS256C                        ","Medium Type"="Solid State","Physical Block Size"=512,"SATA Features"=23,"Serial Number"="        X06S10H7THRZ","Product Revision Level"="CJAA0201"}
  |   "Protocol Characteristics" = {"Physical Interconnect"="SATA","Physical Interconnect Location"="Internal"}
  |   "SMART Capable" = Yes
  |   "IOMinimumSegmentAlignmentByteCount" = 4
  | }
  | 
  +-o IOBlockStorageDriver  <class IORegistryEntry:IOService:IOStorage:IOBlockStorageDriver, id 0x100000219, registered, matched, active, busy 0 (471 ms), retain 8>
    +-o APPLE SSD TS256C Media  <class IORegistryEntry:IOService:IOStorage:IOMedia, id 0x10000021a, registered, matched, active, busy 0 (471 ms), retain 11>
      +-o IOMediaBSDClient  <class IORegistryEntry:IOService:IOMediaBSDClient, id 0x10000021b, registered, matched, active, busy 0 (0 ms), retain 6>
      +-o IOGUIDPartitionScheme  <class IORegistryEntry:IOService:IOStorage:IOPartitionScheme:IOGUIDPartitionScheme, id 0x10000021d, !registered, !matched, active, busy 0 (3 ms), retain 8>
        +-o EFI system partition@1  <class IORegistryEntry:IOService:IOStorage:IOMedia, id 0x100000263, registered, matched, active, busy 0 (0 ms), retain 9>
        | +-o IOMediaBSDClient  <class IORegistryEntry:IOService:IOMediaBSDClient, id 0x100000266, registered, matched, active, busy 0 (0 ms), retain 6>
        +-o Customer@2  <class IORegistryEntry:IOService:IOStorage:IOMedia, id 0x100000264, registered, matched, active, busy 0 (2 ms), retain 11>
        | +-o IOMediaBSDClient  <class IORegistryEntry:IOService:IOMediaBSDClient, id 0x100000267, registered, matched, active, busy 0 (0 ms), retain 7>
        +-o Recovery HD@3  <class IORegistryEntry:IOService:IOStorage:IOMedia, id 0x100000265, registered, matched, active, busy 0 (3 ms), retain 9>
          +-o IOMediaBSDClient  <class IORegistryEntry:IOService:IOMediaBSDClient, id 0x100000268, registered, matched, active, busy 0 (0 ms), retain 6>

您可以通过IOKit用户库以编程方式获取这些属性，正如您已经在USB中发现的那样。

在更高的层次上，一些信息也可以通过磁盘仲裁框架，通过DADiskCopyDescription function获得。通过此函数公开的设备属性似乎没有记录在DADisk.h头文件之外，但它们是不言而喻的，例如：

extern const CFStringRef kDADiskDescriptionDeviceGUIDKey;      /* ( CFData       ) */
extern const CFStringRef kDADiskDescriptionDeviceInternalKey;  /* ( CFBoolean    ) */
extern const CFStringRef kDADiskDescriptionDeviceModelKey;     /* ( CFString     ) */
extern const CFStringRef kDADiskDescriptionDevicePathKey;      /* ( CFString     ) */
extern const CFStringRef kDADiskDescriptionDeviceProtocolKey;  /* ( CFString     ) */
extern const CFStringRef kDADiskDescriptionDeviceRevisionKey;  /* ( CFString     ) */
extern const CFStringRef kDADiskDescriptionDeviceUnitKey;      /* ( CFNumber     ) */
extern const CFStringRef kDADiskDescriptionDeviceVendorKey;    /* ( CFString     ) */

Answer 2

我相信您想要做的是查看设备描述符，看看它是否有序列号。由设备提供序列号，如果提供了序列号，则该序列号可能不是唯一的。如果设备有一个自定义描述符，那么其中也可能有用处。

有关描述符，请参阅以下内容：http://www.beyondlogic.org/usbnutshell/usb5.shtml

似乎有一个属性可以获取HID设备包装类上的序列号：

https://developer.apple.com/library/mac/#documentation/IOKit/Reference/IOHIDBase_header_reference/Reference/reference.html#//apple_ref/doc/uid/TP40012400

如果这不起作用，应该有一种方法可以直接访问USB设备并请求所需的数据。