ALCKEY: Uses ALC Values to Filter Input

ALCKEY is a Microsoft(R) Windows(TM) for Pen Computing
 program that shows how to use ALC values to specify how an
hedit (or bedit) control will filter its input.

ALC values define the types of values that a pen hedit or
bedit control will recognize. For example, ALC_NUMERIC
allows only numeric values to be recognized in a
particular control. Using ALC values allows you greater
freedom in customizing your application's response to ink.
Defining a small subset of ALC values for an edit control
increases the recognition of those values.

ALCKEY displays two edit controls: an hedit and a bedit.
You can select flags from the ALC dialog box for the hedit
control. The bedit control remains unchanged so you can
see the difference between the settings of the two
controls.

ALCKEY also demonstrates the use of the ShowKeyboard
function and shows the recommended way of interfacing to
the virtual keyboard through an owner-drawn "keyboard"
button. Notice that the virtual keyboard always stays on
top but never has the focus. The keyboard output is
directed to the last control that had the focus. ALCKEY
also demonstrates a way to ensure that only valid controls
get the focus. The virtual keyboard in Windows for Pen
Computing version 1.0 is not affected by the filtering
effects of ALC values. Only recognized ink is affected;
the keyboard does not involve inking so it bypasses this
step.

 ALCKEY was built and tested under Microsoft Windows
version 3.1. The program requires PENWIN.DLL, which can be
found in both Microsoft Windows for Pen Computing and the
Microsoft Windows version 3.1 Software Development Kit
(SDK).

KEYWORDS: PR-CD2; LoadString; LoadBitmap;
GetSystemMetrics; CreateCompatibleDC; StretchBlt; _fmemcpy