_KEYHIT

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The _KEYHIT function returns ASCII one and two byte, OpenGL Virtual Key and Unicode keyboard key press codes.


Syntax

keycode& = _KEYHIT


Description

  • 0-255: ASCII values (Refer to CP437).
  • 256-65535: 2-byte character codes : code = CVI(CHR$(0) + CHR$(scancode)) (unaffected by SHIFT/ALT/CTRL modifiers).
  • 65536-&H40000000: QB64-specific Virtual Key codes (designated with + for 100000 on keyboard below)
  • Negative LONG values returned indicate that a key was released or a lock function key has been turned off.
  • Note: _KEYHIT can only return one value at a time so use the _KEYDOWN keyhit value to find key combinations.
  • To receive input from a $CONSOLE window, use _CINP.

' _KEYHIT Keyboard Codes ' 'Esc F1 F2 F3 F4 F5 F6 F7 F8 F9 F10 F11 F12 Sys ScL Pause ' 27 15104 15360 15616 15872 16128 16384 16640 16896 17152 17408 34048 34304 +316 +302 +019 '`~ 1! 2@ 3# 4$ 5% 6^ 7& 8* 9( 0) -_ =+ BkSp Ins Hme PUp NumL / * - '126 33 64 35 36 37 94 38 42 40 41 95 43 8 20992 18176 18688 +300 47 42 45 ' 96 49 50 51 52 53 54 55 56 57 48 45 61 'Tab Q W E R T Y U I O P [{ ]} \| Del End PDn 7Hme 8/▲ 9PU + ' 9 81 87 69 82 84 89 85 73 79 80 123 125 124 21248 20224 20736 18176 18432 18688 43 ' 113 119 101 114 116 121 117 105 111 112 91 93 92 55 56 57 'CapL A S D F G H J K L  ;: '" Enter 4/◄- 5 6/-► '+301 65 83 68 70 71 72 74 75 76 58 34 13 19200 19456 19712 E ' 97 115 100 102 103 104 106 107 108 59 39 52 53 54 n 'Shift Z X C V B N M ,< .> /? Shift ▲ 1End 2/▼ 3PD t '+304 90 88 67 86 66 78 77 60 62 63 +303 18432 20224 20480 20736 e ' 122 120 99 118 98 110 109 44 46 47 49 50 51 r 'Ctrl Win Alt Spacebar Alt Win Menu Ctrl ◄- ▼ -► 0Ins .Del '+306 +311 +308 32 +307 +312 +319 +305 19200 20480 19712 20992 21248 13 ' 48 46 ' ' Lower value = LCase/NumLock On __________________ + = add 100000

NOTE: The above commented table can be copied and pasted directly into the QB64 IDE


  • An important difference between INKEY$ and _KEYHIT is how they work when CTRL, ALT or SHIFT are used. INKEY$ returns a different code if you hold down CTRL, ALT or SHIFT before pressing F1 (for example). _KEYHIT will return the same code regardless of which modifiers were used but you can check _KEYDOWN to see which modifying keys are being used.
  • Keyboards with an Alt Gr key note: _KEYHIT may return both Alt (100307) and Ctrl (100306) codes when AltGr key is pressed or released.


Examples

Example: This routine will return the codes for any keyboard presses.

DEFLNG A-Z SCREEN _NEWIMAGE(800, 600, 8) CLS , 1 font = _LOADFONT("cyberbit.ttf", 24) unifont = _LOADFONT("cyberbit.ttf", 24, "UNICODE") _FONT font DO x = _KEYHIT IF x THEN IF x < 0 THEN 'negative value means key released COLOR 2 PRINT "Released "; x = -x ELSE COLOR 10 PRINT "Pressed "; 'positive value means key pressed END IF IF x < 256 THEN 'ASCII code values PRINT "ASCII "; x; IF x >= 32 AND x <= 255 THEN PRINT "[" + CHR$(x) + "]" ELSE PRINT END IF IF x >= 256 AND x < 65536 THEN '2 byte key codes PRINT "2-BYTE-COMBO "; x AND 255; x \ 256; x2 = x \ 256 IF x2 >= 32 AND x2 <= 255 THEN PRINT "[" + CHR$(x2) + "]" ELSE PRINT END IF IF x >= 100000 AND x < 200000 THEN 'QB84 Virtual Key codes PRINT "SDL VK"; x - 100000 END IF IF x >= 200000 AND x < &H40000000 THEN PRINT "QB64 VK"; x - 200000 END IF IF x >= &H40000000 THEN 'Unicode values (IME Input mode) PRINT "UNICODE "; x - &H40000000; "0x" + HEX$(x - &H40000000) + " ..."; cx = POS(1): cy = CSRLIN _FONT unifont LOCATE cy, cx COLOR 15 z$ = MKL$(x - &H40000000) + MKL$(0) PRINT z$ + z$ + z$; _FONT font LOCATE cy, 1: PRINT END IF END IF LOOP

Code by Galleon


See also



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