An installable driver can let users choose configuration settings for the
driver and associated hardware by displaying a configuration dialog box when
processing the DRV_CONFIGURE
message. The driver is responsible for creating and managing the dialog box,
processing any user input from the dialog box, and changing the configuration
of the driver or hardware as requested by the user. The driver must provide a
separate dialog box procedure to process window messages for the dialog box and a
dialog box template to define the appearance and content of the dialog box.
Before receiving the DRV_CONFIGURE message, a driver receives the DRV_QUERYCONFIGURE
message. The driver must return a nonzero value to the query to ensure
receipt of the subsequent DRV_CONFIGURE message.
When initializing the configuration dialog box, the driver typically retrieves
configuration information from the registry. To help locate this information,
the DRV_CONFIGURE message usually includes the address of a DRVCONFIGINFO
structure that contains the names of the registry key and value associated
with the driver. If the user requests changes to the configuration, the driver
should update the configuration information in the registry.
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