LONG
DrvNumberOfDevices(
PREG_ACCESS RegAccess,
LPDWORD NumberOfDevices
);
The DrvNumberOfDevices function determines the number of device subkeys existing under the driver's \Parameters key in the registry.
Parameters
RegAccess
Pointer to a globally-defined structure of type REG_ACCESS.
NumberOfDevices
Address of a location to receive the number of devices.
Return Value
Returns ERROR_SUCCESS if the operation succeeds. Otherwise returns one of the error codes defined in winerror.h.
Comments
The structure pointed to by RegAccess must be a single, globally-defined REG_ACCESS structure that the driver uses with all calls to drvlib.lib functions requiring a RegAccess parameter.
Drivers create device subkeys by calling DrvCreateDeviceKey.
Drivers must call DrvCreateServicesNode before calling DrvNumberOfDevices.
For additional information, see Installing and Configuring your Driver, Using drvlib.lib.