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Microsoft Windows
3
3-1-2 USING GUIDS
A Globally Unique IDentifier (GUID) is a 128-bit value that uniquely identifies a class or
other entity. Windows uses GUIDs for identifying two types of device classes:
■
Device setup class
■
Device interface class
A device setup GUID encompasses devices that Windows installs in the same way and using
the same class installer and co-installers. Class installers and co-installers are DLLs that
provide functions related to device installation. There is a GUID associated with each device
setup class. System-defined setup class GUIDs are defined in devguid.h. The device setup
class GUID defines the ..\CurrentControlSet\Control\Class\ClassGuid registry key
under which to create a new subkey for any particular device of a standard setup class. A
complete list of system-defined device setup classes offered by Microsoft Windows? is
available on MSDN online documentation ( http://msdn.microsoft.com/en-us/
library/windows/hardware/ff553426(v=vs.85).aspx ).
A device interface class GUID provides a mechanism for applications to communicate with
a driver assigned to devices in a class. A class or device driver can register one or more
device interface classes to enable applications to learn about and communicate with devices
that use the driver. Each device interface class has a device interface GUID. Upon a device;s
first attachment to the PC, the Windows I/O manager associates the device and the device
interface class GUID with a symbolic link name, also called a device path. The device path
is stored in the registry and persists across system reboot. An application can retrieve all the
connected devices within a device interface class. If the application has gotten a device path
for a connected device, this device path can be passed to a function that will return a
handle. This handle is passed to other functions in order to communicate with the
corresponding device.
Three of Micriμm’s USB classes are provided with Visual Studio 2010 projects. These Visual
Studio projects build applications that interact with a USB device. They use a device
interface class GUID to detect any attached device belonging to the class. Table 3-3 shows
the Micriμm class and the corresponding device interface class GUID used in the class
Visual Studio project.
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