Device Plug and Play Messaging System
Windows Embedded CE has a subsystem that is similar to the PnP messaging system of a desktop operating system. When the drivers are loaded, it can provide the system with the information about the classes supported by the device by using either a registry setting (IClass) or by calling the AdvertiseInterface() function directly. A device class is basically a predefined set of functionality implemented by the device.
For instance, DEVCLASS_STREAM_GUID is a regular stream interface driver and DEVCLASS_ CAMERA_GUID is a camera driver.
A messaging subsystem is implemented as part of the Device Manager subsystem. Their interaction is shown in Figure 8–25.
Figure 8–25. Plug and Play messaging system
Any driver or an ...
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