DRV_FREE

The DRV_FREE message requests a user-mode multimedia driver to perform pre-unload operations.

Parameters

dwDriverID

Driver instance identifier. This value is zero for the DRV_FREE message.

hDriver

Driver handle.

uMsg

DRV_FREE

lParam1

Not used. Set to zero.

lParam2

Not used. Set to zero.

Return Value

The driver should return a nonzero value if the operation succeeds. Otherwise it should return zero.

Comments

The DRV_FREE message is one of the standard driver messages. A client sends the message by calling the driver’s DriverProc entry point, passing the specified parameter values.

User-mode drivers receive the DRV_FREE message just prior to being freed (unloaded) from memory. It is the last message a driver receives before being unloaded. The driver should release acquired system resources.

Drivers receive DRV_CLOSE and DRV_DISABLE messages before receiving DRV_FREE.