Installable Driver Functions and Messages
You can open an installable driver from an application by using the
OpenDriver function. This function creates an instance of the driver, loading the driver
into memory if no other instance exists, and returns the handle of the new
instance. When opening an installable driver, you must supply either the full path
of the driver or the names of the registry key and value associated with the
driver.
Once a driver is open, you can direct it to carry out tasks by using the
SendDriverMessage function to send driver messages to the driver. For example, you can direct
the driver to display its configuration dialog box by sending the
DRV_CONFIGURE message. Before sending this message, you must determine whether the driver
has a configuration dialog box by sending the
DRV_QUERYCONFIGURE message and checking for a nonzero return value. Many drivers provide a set
of custom messages that you can send to direct the operations of the driver.
If you need special access to an installable driver, such as access to its
resources, you can retrieve the module handle of the driver by using the
GetDriverModuleHandle function.
When you no longer need the installable driver, you can close it by using the
CloseDriver function.
You can use the installable driver functions and messages to open and manage
any installable driver. However, the recommended course of action for opening
and managing multimedia devices is to first use standard services (such as
waveOutOpen,
waveOutMessage, and
waveOutClose for waveform output devices), if they exist. If standard services do not
exist for a multimedia driver, then open and manage the driver using the
installable driver functions and messages.
Note The
SendDriverMessage and
GetDriverModuleHandle functions are the preferred functions to use to send messages to a driver and
to obtain a handle to a module instance. The older
DrvGetModuleHandle function, however, has been included to maintain compatibility with previous
versions of the Windows operating system.
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