Distinguishing Between Keyboard Keys and their Keypad Duplicat

 Last reviewed: January 21, 1997
Article ID: Q96242
The information in this article applies to:
  • Microsoft Win32 Application Programming Interface (API) included with: 

        - Microsoft Windows NT versions 3.1, 3.5, 3.51, 4.0
    - Microsoft Windows 95 version 4.0

SUMMARY

It is possible using ReadConsoleInput() or PeekConsole() to distinguish between a key on the main keyboard and it's duplicate key on the numeric keypad. The KEY_EVENT_RECORD structure in the INPUT_RECORD structure must be used to distinguish between the two keys.

MORE INFORMATION

The following example illustrates what the KEY_EVENT_RECORD structure is filled with after a keyboard ENTER key versus a numeric keypad ENTER key is pressed.

Keyboard ENTER Key

   KeyEvent.wRepeatCount     = 1
   KeyEvent.wVirtualKeyCode  = 13
   KeyEvent.wVirtualScanCode = 28
   KeyEvent.dwControlKeyState= 00000000

Numeric Keypad ENTER Key

   KeyEvent.wRepeatCount     = 1
   KeyEvent.wVirtualKeyCode  = 13
   KeyEvent.wVirtualScanCode = 28
   KeyEvent.dwControlKeyState= 00000100
In the case of the numeric keypad key, in dwControlKeyState, the ENHANCED_KEY bit is set.

KBCategory: kbprg
KBSubcategory: BseCon
Additional reference words: 3.10 3.50 3.51 4.00 95

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Last reviewed: January 21, 1997
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