DriverProc - Win32 Multimedia Programmer's Reference (mmedia.hlp)

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DriverProc

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);

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:

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.

lParam1 and lParam2

32-bit message-specific value.

Return Value
Returns nonzero if successful or zero otherwise.

Remarks
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.

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