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Chapter 3 — Configuring the Computer
751G Color Mobile Computer User’s Manual 99
• IOCTL_HAL_COLDBOOT
Forces a cold reboot. This resets the 751G, reloads Windows CE as if a
power-up was performed, and discards the contents of the Windows CE
RAM-based object store (page 74).
• IOCTL_HAL_WARMBOOT
Performs a system warm-boot, preserving the object store (page 73).
Reprogramming the 751G Keypad
Applications have the ability to remap keys on the 751G keypad. This
allows applications to enable keys that would otherwise not be available,
such as the [F1] function key. Also, to disable keys that should not be
available, such as the alpha key because no alpha entry is required. Use care
when attempting to remap the keypad because improper remapping may
render the keypad unusable. Cold-booting the device loads the default
keymap, thus correcting this situation.
Note that remapping the keys in this way affects the key mapping for the
entire system, not just for the application that does the remapping.
There are three “planes” supported for the 751G keypad. Keys used in
more than one shift plane must be described in each plane.
• The unshifted plane contains values from the keypad when not pressed
with other keys, such as pressing [1] to enter a “1.”
• The orange plane contains values from the keypad when a key is
simultaneously pressed with the [orange] key, such as pressing [orange]
[1] to enter a “Send” command.
• The alpha plane contains values from the keypad when the keypad is
placed in alpha mode by pressing the green [Alpha] key, such as pressing
[Alpha] [1] to enter a “Caps” command.
Key Values
Key values for each plane are stored in the registry. All units ship with a
default key mapping already loaded in the registry. Applications that wish
to change the default mapping need to read the appropriate key from the
registry into an array of Words, modify the values required and then write
the updated values back into the registry. The registry access can be done
with standard Microsoft API calls, such as RegOpenKeyEx(),
RegQueryValueEx(), and RegSetValueEx().
Note: Using IOCTL_HAL_REBOOT is no longer recommended, use
either IOCTL_HAL_WARMBOOT or IOCTL_HAL_COLDBOOT.
IOCTL_HAL_REBOOT is still supported for backward-compatibility but
its use can lead to difficulties.
Note: Use caution when remapping the keypad. Improper remapping may
render the keypad unusable. Data within the 751G could also be lost,
should any problems occur.