Appendix Accessing the Pen Device Driver
There are no specific functions in the Pen Application Programming Interface
(API) for pen driver use. Instead, the pen driver functionality is implemented
with install-able driver messages.
The pen driver is a 16-bit installable driver in the Microsoft Windows 95
operating system. All communication with an installable driver is through driver
messages. A 16-bit application can send a message to the pen driver with the
Windows API
SendDriverMessage function.
Because a call to
SendDriverMessage must originate from a 16-bit virtual machine, 32-bit applications cannot use
SendDriverMessage to send messages directly to the pen driver. To communicate with the pen
driver, a 32-bit application must provide its own 16-bit dynamic-link library (DLL)
to "thunk" calls to
SendDriverMessage.
The installable portion of the pen driver may not exist in future versions of
Win-dows. For this reason, an application should not query for device
information directly from the driver unless necessary. Instead, an application should
get hardware information about an
HPENDATA object by calling
GetPenDataInfo or
GetPenDataAttributes. These functions can apprise an application of various hardware
characteristics (such as sampling rate) current when collecting the
HPENDATA.
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