在USB编程之前要事先了解一下GUID的概念。
应用其他网页中的定义：
全球唯一标识符 (GUID) 是一个字母数字标识符，用于指示产品的唯一性安装。在许多流行软件应用程序（例如
Web 浏览器和媒体播放器）中，都使用 GUID。
GUID
的格式为“xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx”，其中每个 x 是 0-9 或 a-f
范围内的一个十六进制的数字。例如：6F9619FF-8B86-D011-B42D-00C04FC964FF 即为有效的 GUID
值。
在计算机领域有很多东西需要不重复的唯一标识的东西，例如设备的类型，类，接口标识，目录名等等。这是个天文数字，我记得是有工具能自动生成这个GUID码的，反正不同地点，不同时间，生成相同的GUID的可能性很小很小很小，小到什么程度，没查过，基本上可以认为是不可能生成相同的GUID值的。
计算机中有各种个样的设备类型，这些设备类型被微软用固定的GUID来标识了，这些GUID对实际编程是有很大关系的，用错了会麻烦，我查了一下文档，把查到的设备类型的GUID列在下面供大家参考：
1394 Host Bus
Controller
Class = 1394
ClassGuid =
{6bdd1fc1-810f-11d0-bec7-08002be2092f}
This class includes system-supplied
drivers of 1394 host controllers connected on a PCI bus, but not drivers of 1394
peripherals.
Battery Devices
Class =
Battery
ClassGuid = {72631e54-78a4-11d0-bcf7-00aa00b7b32a}
This class
includes drivers of battery devices and UPSes.
CD-ROM Drives
Class =
CDROM
ClassGuid = {4d36e965-e325-11ce-bfc1-08002be10318}
This class
includes drivers of CD-ROM drives, including SCSI CD-ROM drives. By default, the
system‘s CD-ROM class installer also installs a system-supplied CD audio driver
and CD-ROM changer driver as PnP filters.
Disk Drives
Class =
DiskDrive
ClassGuid = {4d36e967-e325-11ce-bfc1-08002be10318}
This class
includes drivers of hard disk drives. See also the HDC and SCSIAdapter
classes.
Display Adapters
Class =
Display
ClassGuid = {4d36e968-e325-11ce-bfc1-08002be10318}
This class
includes drivers of video adapters, including display drivers and video
miniports.
Floppy Disk
Controllers
Class = FDC
ClassGuid =
{4d36e969-e325-11ce-bfc1-08002be10318}
This class includes drivers of floppy
disk drive controllers.
Floppy Disk Drives
Class=
FloppyDisk
ClassGuid= {4d36e980-e325-11ce-bfc1-08002be10318}
This class
includes drivers of floppy drives.
Hard Disk
Controllers
Class = HDC
ClassGuid =
{4d36e96a-e325-11ce-bfc1-08002be10318}
This class includes drivers of hard
disk controllers, including ATA/ATAPI controllers but not SCSI and RAID disk
controllers.
Human Input Devices
(HID)
Class = HIDClass
ClassGuid =
{745a17a0-74d3-11d0-b6fe-00a0c90f57da}
This class includes devices that
export interfaces of the HID class, including HID keyboard and mouse devices,
which the installed HID device drivers enumerate as their respective "child"
devices. (See also the Keyboard or Mouse classes later in this list.)
Imaging Device
Class =
Image
ClassGuid = {6bdd1fc6-810f-11d0-bec7-08002be2092f}
This class
includes drivers of still-image capture devices, digital cameras, and
scanners.
IrDA Devices
Class =
Infrared
ClassGuid = {6bdd1fc5-810f-11d0-bec7-08002be2092f}
This class
includes Serial-IR and Fast-IR NDIS miniports, but see also the Network Adapter
class for other NDIS NIC miniports.
Keyboard
Class =
Keyboard
ClassGuid = {4d36e96b-e325-11ce-bfc1-08002be10318}
This class
includes all keyboards. That is, it also must be specified in the (secondary)
INF for an enumerated "child" HID keyboard device.
Medium Changers
Class=
MediumChanger
ClassGuid= {ce5939ae-ebde-11d0-b181-0000f8753ec4}
This class
includes drivers of SCSI media changer devices.
Memory Technology
Driver
Class = MTD
ClassGUID =
{4d36e970-e325-11ce-bfc1-08002be10318}
This class includes drivers for memory
devices, such as flash memory cards.
Multimedia
Class =
Media
ClassGuid = {4d36e96c-e325-11ce-bfc1-08002be10318}
This class
includes Audio and DVD multimedia devices, joystick ports, and full-motion
video-capture devices.
Modem
Class =
Modem
ClassGuid = {4d36e96d-e325-11ce-bfc1-08002be10318}
This class
installs modems. An INF for a device of this class installs no device driver(s),
but rather specifies the features and configuration information of a particular
modem and stores this information in the registry. See also the Multifunction
class.
Monitor
Class =
Monitor
ClassGuid = {4d36e96e-e325-11ce-bfc1-08002be10318}
This class
includes display monitors. An INF for a device of this class installs no device
driver(s), but rather specifies the features of a particular monitor to be
stored in the registry for use by drivers of video adapters. (Monitors are
enumerated as the child devices of display adapters.)
Mouse
Class =
Mouse
ClassGuid = {4d36e96f-e325-11ce-bfc1-08002be10318}
This class
includes all mice and other kinds of pointing devices, such as trackballs. That
is, it also must be specified in the (secondary) INF for an enumerated "child"
HID mouse device.
Multifunction
Devices
Class = Multifunction
ClassGuid =
{4d36e971-e325-11ce-bfc1-08002be10318}
This class includes combo cards, such
as a PCMCIA modem and netcard adapter. The driver for such a PnP multifunction
device is installed under this class and enumerates the modem and netcard
separately as its "child" devices.
Multi-port Serial
Adapters
Class = MultiportSerial
ClassGuid =
{50906cb8-ba12-11d1-bf5d-0000f805f530}
This class includes intelligent
multiport serial cards, but not peripheral devices that connect to its ports. It
does not include unintelligent (16550-type) mutiport serial controllers or
single-port serial controllers (see the Ports class).
Network Adapter
Class =
Net
ClassGuid = {4d36e972-e325-11ce-bfc1-08002be10318}
This class includes
NDIS NIC miniports excluding Fast-IR miniports, NDIS intermediate drivers (of
"virtual adapters"), and CoNDIS MCM miniports.
Network Client
Class =
NetClient
ClassGuid = {4d36e973-e325-11ce-bfc1-08002be10318}
This class
includes network and/or print providers.
Network Service
Class =
NetService
ClassGuid = {4d36e974-e325-11ce-bfc1-08002be10318}
This class
includes network services, such as redirectors and servers.
Network Transport
Class =
NetTrans
ClassGuid = {4d36e975-e325-11ce-bfc1-08002be10318}
This class
includes NDIS protocols, CoNDIS stand-alone call managers, and CoNDIS clients,
as well as higher level drivers in transport stacks.
PCMCIA Adapters
Class =
PCMCIA
ClassGuid = {4d36e977-e325-11ce-bfc1-08002be10318}
This class
includes system-supplied drivers of PCMCIA and CardBus host controllers, but not
drivers of PCMCIA or CardBus peripherals.
Ports (COM & LPT serial
ports)
Class = Ports
ClassGuid =
{4d36e978-e325-11ce-bfc1-08002be10318}
This class includes drivers of serial
or parallel port devices, but see also the MultiportSerial class.
Printer
Class =
Printer
ClassGuid = {4d36e979-e325-11ce-bfc1-08002be10318}
This class
includes printers.
SCSI and RAID
Controllers
Class = SCSIAdapter
ClassGuid =
{4d36e97b-e325-11ce-bfc1-08002be10318}
This class includes SCSI HBA miniports
and disk-array controller drivers.
Smart Card Readers
Class
= SmartCardReader
ClassGuid = {50dd5230-ba8a-11d1-bf5d-0000f805f530}
This
class includes drivers for smart card readers.
Storage Volumes
Class =
Volume
ClassGuid = {71a27cdd-812a-11d0-bec7-08002be2092f}
This class
includes storage volumes as defined by the system-supplied logical volume
manager and class drivers that create device objects to represent storage
volumes, such as the system disk class driver.
System Devices
Class =
System
ClassGuid = {4d36e97d-e325-11ce-bfc1-08002be10318}
This class
includes the Windows? 2000 HALs, system bus drivers, the system ACPI driver, and
the system volume-manager driver. It also includes battery drivers and UPS
drivers.
Tape Drives
Class =
TapeDrive
ClassGuid = {6d807884-7d21-11cf-801c-08002be10318}
This class
includes drivers of tape drives, including all tape miniclass drivers.
USB
Class =
USB
ClassGuid = {36fc9e60-c465-11cf-8056-444553540000}
This class includes
system-supplied (bus) drivers of USB host controllers and drivers of USB hubs,
but not drivers of USB peripherals.
The following classes and GUIDs should not be used to install devices (or drivers) on Windows 2000 platforms:
Adapter
Class =
Adapter
ClassGUID = {4d36e964-e325-11ce-bfc1-08002be10318}
This class is
obsolete.
APM
Class =
APMSupport
ClassGUID = {d45b1c18-c8fa-11d1-9f77-0000f805f530}
This class
is reserved for system use.
Computer
Class =
Computer
ClassGUID = {4d36e966-e325-11ce-bfc1-08002be10318}
This class is
reserved for system use.
Decoders
Class =
Decoder
ClassGUID = {6bdd1fc2-810f-11d0-bec7-08002be2092f}
This class is
reserved for future use.
Global Positioning
System
Class = GPS
ClassGUID =
{6bdd1fc3-810f-11d0-bec7-08002be2092f}
This class is reserved for future
use.
No driver
Class =
NoDriver
ClassGUID = {4d36e976-e325-11ce-bfc1-08002be10318}
This class is
obsolete.
Non-Plug and Play
Drivers
Class = LegacyDriver
ClassGUID =
{8ecc055d-047f-11d1-a537-0000f8753ed1}
This class is reserved for system
use.
Other Devices
Class =
Unknown
ClassGUID = {4d36e97e-e325-11ce-bfc1-08002be10318}
This class is
reserved for system use. Enumerated devices for which the system cannot
determine the type are installed under this class. Do not use this class if
you‘re unsure in which class your device belongs; either determine the correct
device setup class or create a new class.
Printer Upgrade
Class =
Printer Upgrade
ClassGUID = {4d36e97a-e325-11ce-bfc1-08002be10318}
This
class is reserved for system use.
Sound
Class =
Sound
ClassGUID = {4d36e97c-e325-11ce-bfc1-08002be10318}
This class is
obsolete.
USB Mass Storage Device
ClassGUID = a5dcbf10-6530-11d2-901f-00c04fb951ed
USB编程研究之二（常见设备类型的GUID),布布扣,bubuko.com
原文：http://www.cnblogs.com/host-2008/p/3673119.html