Motorola SYMBOL MINISCAN MSXX04 Guía de usuario Pagina 61

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Chapter 7: Keyboard and Keyboard Remapping
Keyboard
49
Psion Mobile Devices Developers Guide
7.1 Key b o a rd
Microsoft Windows maintains a device-independent keyboard model that enables it to support a variety of
keyboards. At the lowest level, each key on the keyboard generates a scan code when the key is pressed
and released. The scan code is a hardware-dependent number that identifies the physical location of the
key on the keyboard. Unlike Windows-based desktop operating systems, Windows CE and Windows Mobile
have no standard set of keyboard scan codes. The keyboard driver maps each scan code to a virtual key
code. The virtual key code is a hardware-independent number that identifies the key to be sent to
the application.
Because keyboard layouts vary between spoken languages, Windows offers only the core set of virtual key
codes that are found on all keyboards. This core set includes English characters, numbers, and a few critical
keys, such as the function, and arrow, keys.
In addition to mapping, the Windows keyboard driver determines which characters the virtual key gener-
ates. A single virtual key can generate different characters depending on the state of the, BLUE, ORANGE,
SYM, ALT, CTRL, and SHIFT, modifier keys.
The Mobile Devices SDK provides support for the Psion-specific keys.
7.1.1 Supported Keyboards
When the keyboard type is queried through the Mobile Devices SDK, the following strings may be returned:
Computer Keyboard Description Strings
7530 / 7535
36-Key
37-Key
58-Key
63-Key
None
8515 / 8525 / 8530
68-Key ABC
68-Key Azerty
68-Key Qwerty
Unknown
None
Ikôn (7505)
28-Key WinCE
28-Key WM
28-Key WM Phone
47-Key
47-key AZERTY
Unknown
NEO (PX750)
26-Key
48-Key
Unknown
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