Psion Teklogix 7527S User's Guide download pdf (Page 67)

Chapter 9: Keyboard

Keyboard

Psion Teklogix Mobile Devices SDK Developers Guide 55

9.1 Keyboard

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 has no standard set of keyboard scan codes. The keyboard driver translates or 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, num-

bers, 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

generates. A single virtual key can generate different characters depending on the state of modifier

keys, such as the [SHIFT] and [CTRL] keys.

The Mobile Devices SDK provides support for the Psion Teklogix-specific keys.

9.1.1 Supported Keyboards

When the keyboard type is queried through the Mobile Devices SDK, the following strings may

be returned:

Psion Teklogix 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

28-Key WinCE

28-Key WM

28-Key WM Phone

47-Key

Unknown

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Psion Teklogix 7527S User's Guide Page 67