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<TD id=3D_ctl0__ctl0_=D6=F7=C3=E6=B0=E5 =
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<TD align=3Dmiddle><SPAN =
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<P align=3Dleft><STRONG></STRONG><A=20
=
href=3D"http://www.biplip.com/download/sourcecodes/TOUCH_CE.zip"><IMG=20
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(32K)</P>
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>
<P>The touch screen driver reads input =
from=20
touch screen hardware and converts it to =
touch=20
events that are sent to the input =
system. The=20
driver is also responsible for =
converting=20
uncalibrated coordinates to calibrated=20
coordinates that take into account any =
hardware=20
anomalies, such as skew or nonlinear =
sequences.=20
</P>
<P>The driver must submit points while =
the=20
user"s finger or stylus is touching the =
touch=20
screen. When the user"s finger or stylus =
is=20
removed from the screen, the driver must =
submit=20
at least one final event indicating that =
the=20
user"s finger or stylus tip was removed. =
The=20
calibrated coordinates must be reported =
to the=20
nearest one-quarter of a pixel.</P>
<P>The following steps detail the basic=20
algorithm for using the touch screen:=20
<OL type=3D1>
<LI>Call <U><FONT=20
=
color=3D#050c0b>TouchPanelEnable</FONT></U> to=20
start the screen sampling.=20
<LI>Call <U>TouchPanelGetDeviceCaps</U> =
to=20
request the number of sampling points.=20
<LI>For every calibration point, perform =
the=20
following steps:=20
<OL type=3Da>
<LI>Call <U>TouchPanelGetDeviceCaps</U> =
to get a=20
calibration coordinate.=20
<LI>Draw a crosshair at the returned =
coordinate.=20
<LI>Call =
<U>TouchPanelReadCalibrationPoint=20
</U>to get calibration data. </LI></OL>
<LI>Call <U>TouchPanelSetCalibration =
</U>to=20
calculate the calibration coefficients.=20
</LI></OL>
<P>After executing this sequence, any =
finger or=20
stylus samples generated for the screen =
are=20
passed to the callback function =
specified in=20
<B>TouchPanelEnable</B>. The driver may =
pass=20
either calibrated or uncalibrated points =
to the=20
callback. If the driver has an efficient =
calibration algorithm, it can return =
calibrated=20
points. However, if the calibration is=20
computationally intensive, the driver =
may choose=20
to return uncalibrated points, rather =
than=20
perform extensive calculations in the=20
high-priority driver thread. The lower =
priority=20
thread processing points from the =
callback can=20
then perform the calibration. </P>
<P>You can calibrate your touch screen =
without=20
the ENTER key. The GWES keyboard code =
opens=20
=
<B>HKEY_LOCAL_MACHINE\HARDWARE\DEVICEMAP\KEYBD</B>=20
and looks for a <B>DWORD</B> value =
called=20
<B>Status</B>. This is a bit mask =
combining the=20
KBDI_KEYBOARD_XXX values from=20
=
%_WINCEROOT%\Public\Common\SDK\INC\Keybd.h. If=20
it is not found, GWES assumes=20
KBDI_KEYBOARD_PRESENT | =
KBDI_KEYBOARD_ENTER_ESC=20
| KBDI_KEYBOARD_ALPHA_NUM. This registry =
access=20
only occurs once, when the keyboard =
driver is=20
loaded. This value is the basis for what =
you get=20
when you call <U>GetKeyboardStatus</U>. =
GWES=20
will add or subtract the =
KBDI_KEYBOARD_ENABLED=20
bit based on =
<U>EnableHardwareKeyboard</U>=20
calls. The KBDI_KEYBOARD_ENABLED bit is =
set when=20
the keyboard driver is loaded. The=20
<B>UseEnterEsc</B> behavior can be =
controlled by=20
a registry key.</P>
<P>The following table shows the touch =
screen=20
driver functions.</P>
<DIV class=3Dtablediv>
<TABLE class=3DdtTABLE cellSpacing=3D0>
<TBODY>
<TR vAlign=3Dtop>
<TH width=3D"43%">Function</TH>
<TH width=3D"57%">Description</TH></TR>
<TR vAlign=3Dtop>
<TD =
width=3D"43%"><U>DdsiTouchPanelAttach</U></TD>
<TD width=3D"57%">Called when the MDD"s =
DLL entry=20
point gets a DLL_PROCESS_ATTACH=20
message.</TD></TR>
<TR vAlign=3Dtop>
<TD =
width=3D"43%"><U>DdsiTouchPanelDetach</U></TD>
<TD width=3D"57%">Called when the MDD"s =
DLL entry=20
point gets a DLL_PROCESS_DETACH=20
message.</TD></TR>
<TR vAlign=3Dtop>
<TD=20
width=3D"43%"><U>DdsiTouchPanelDisable</U></TD>
<TD width=3D"57%">Disables the touch =
screen=20
device.</TD></TR>
<TR vAlign=3Dtop>
<TD =
width=3D"43%"><U>DdsiTouchPanelEnable</U></TD>
<TD width=3D"57%">Applies power to the =
touch=20
screen device and initializes it for=20
operation.</TD></TR>
<TR vAlign=3Dtop>
<TD=20
=
width=3D"43%"><U>DdsiTouchPanelGetDeviceCaps</U></TD>
<TD width=3D"57%">Queries for =
capabilities of the=20
touch screen device.</TD></TR>
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