DRV_CONFIGURE

The DRV_CONFIGURE message requests a user-mode multimedia driver to display a dialog box that allows administrators to modify the driver’s hardware configuration parameters.

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_CONFIGURE

lParam1

Handle to the parent window the driver should use when creating a configuration dialog box.

lParam2

If not null, specifies the address of a DRVCONFIGINFO structure.

Return Value

The driver should provide one of the following return values:

DRVCNF_CANCEL	The user canceled the configuration dialog box.
DRVCNF_OK	The configuration operation was successful.
DRVCNF_RESTART	The configuration operation was successful. The new configuration does not take effect until Windows NT is restarted.

Comments

The DRV_CONFIGURE 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.

Drivers display a dialog box to obtain configuration parameters from the system administrator. Your driver must confirm that the client has Administrator privilege.

Configuration parameters typically include information the kernel-mode driver needs in order to access the hardware, such as an interrupt number, DMA channel, and port address. After obtaining this information from the dialog box, the user-mode driver stores it in the registry, as described in Storing Hardware Configuration Parameters, where it is accessible to the kernel-mode driver.

Drivers receive a DRV_OPEN message before receiving DRV_CONFIGURE.

Some drivers combine installation and configuration operations into one step and perform them upon receipt of either a DRV_INSTALL or a DRV_CONFIGURE message.

If the driver returns DRVCNF_RESTART, you can assume that the caller will display a message telling the administrator to restart Windows NT.

You can assume that the Control Panel’s Multimedia applet will not install a driver that cannot be configured. When installing a driver, the Multimedia applet sends a DRV_CONFIGURE message immediately after sending DRV_INSTALL. If the driver returns DRVCNF_CANCEL in response to DRV_CONFIGURE, the driver is not installed.