The DRV_REMOVE message requests a user-mode multimedia driver to allow a system administrator to perform removal operations.
Parameters
dwDriverID
Driver instance identifier. This is the value returned by the driver in response to the DRV_OPEN message.
hDriver
Driver handle.
uMsg
DRV_REMOVE
lParam1
Not used. Set to zero.
lParam2
Not used. Set to zero.
Return Value
Drivers provide one of the following return values:
| DRVCNF_CANCEL | The removal operation failed. |
| DRVCNF_OK | The removal operation was successful. |
| DRVCNF_RESTART | The removal operation was successful. The removal does not take effect until Windows NT is restarted. |
Comments
The DRV_REMOVE 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. Typically, this message is sent by the Control Panel’s Multimedia applet.
Removal is the opposite of installation. Removal operations might include removing a kernel-mode driver and deleting Windows NT Registry keys that were created during installation.
Drivers receive a DRV_OPEN message before receiving DRV_REMOVE.
If the driver returns DRVCNF_RESTART, you can assume that the caller will display a message telling the administrator to restart Windows NT.
See Also