GUID_DEVINTERFACE_MODEM

The GUID_DEVINTERFACE_MODEM device interface class is defined for modem devices.

Remarks

Drivers for modem devices register instances of this device interface class to notify the operating system and applications of the presence of modem devices.

GUID_DEVINTERFACE_MODEM in Ntddmodm.h will be defined correctly only if the correct versions of the INITGUID and DEFINE_GUID macros are defined before the inclusion of Ntddmodm.h. The DEFINE_GUID macro is defined in the Guiddef.h. To make sure that INITGUID, DEFINE_GUID, and GUID_DEVINTERFACE_MODEM are correctly defined, include the following code in a header file:

#ifndef INITGUID
#define INITGUID
#include <guiddef.h>
#undef INITGUID
#else 
#include <guiddef.h>
#endif

#include <ntddmodm.h>
...

For information about modem devices, see Modem Devices Design Guide.

For an example of using this device interface class, see the FakeModem - Unimodem controller-less modem sample driver sample that is provided in the WDK.

GUID_CLASS_MODEM is an obsolete identifier for this device interface class; for new instances of this class, use GUID_DEVINTERFACE_MODEM instead.

Requirements

See also

GUID_CLASS_MODEM