DriverProcProcesses driver messages for the installable driver. DriverProc is a driver-supplied function. LONG DriverProc(DWORD dwDriverId, HDRVR hdrvr, UINT msg,
LONG lParam1, LONG lParam2);
Parameters dwDriverId Identifier of the installable driver. hdrvr Handle of the installable driver instance. Each instance of the installable driver has a unique handle. msg Driver message value. It can be a custom value or one of these standard values:
||Notifies the driver that it should decrement its usage count and unload the
driver if the count is zero.
||Notifies the driver that it should display a configuration dialog box. This
message is sent only if the driver returns a nonzero value when processing the DRV_QUERYCONFIGURE message.
||Notifies the driver that its allocated memory is about to be freed.
||Notifies the driver that it has been loaded or reloaded or that Windows has
||Notifies the driver that it will be discarded.
||Notifies the driver that it has been successfully installed.
||Notifies the driver that it has been successfully loaded.
||Notifies the driver that it is about to be opened.
||Notifies the driver that the device's power source is about to be turned on or
||Directs the driver to specify whether it supports the DRV_CONFIGURE message.
||Notifies the driver that it is about to be removed from the system.
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