Processes driver messages for the installable driver. DriverProc is a driver-supplied function.
LONG DriverProc(DWORD dwDriverId, HDRVR hdrvr, UINT msg,
LONG lParam1, LONG lParam2);
| DRV_CLOSE | Notifies the driver that it should decrement its usage count and unload the driver if the count is zero. |
| DRV_CONFIGURE | 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. |
| DRV_DISABLE | Notifies the driver that its allocated memory is about to be freed. |
| DRV_ENABLE | Notifies the driver that it has been loaded or reloaded or that Windows has been enabled. |
| DRV_FREE | Notifies the driver that it will be discarded. |
| DRV_INSTALL | Notifies the driver that it has been successfully installed. |
| DRV_LOAD | Notifies the driver that it has been successfully loaded. |
| DRV_OPEN | Notifies the driver that it is about to be opened. |
| DRV_POWER | Notifies the driver that the device's power source is about to be turned on or off. |
| DRV_QUERYCONFIGURE | Directs the driver to specify whether it supports the DRV_CONFIGURE message. |
| DRV_REMOVE | Notifies the driver that it is about to be removed from the system. |
Returns nonzero if successful or zero otherwise.
When msg is DRV_OPEN, lParam1 is the string following the driver filename from the SYSTEM.INI file and lParam2 is the value given as the lParam parameter in a call to the OpenDriver function.
When msg is DRV_CLOSE, lParam1 and lParam2 are the same values as the lParam1 and lParam2 parameters in a call to the CloseDriver function.
Windows NT: Requires version 3.1 or later.
Windows: Requires Windows 95 or later.
Windows CE: Unsupported.
Header: Declared in mmsystem.h.
Import Library: User-defined.