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software / rapidq / Examples / Devices / keyboard / Disable low level keys / modDisableLowLevelKeys.bas

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     Attribute VB_Name = "modDisableLowLevelKeys"
     OPTION EXPLICIT

     Public DECLARE SUB CopyMemory LIB "kernel32" ALIAS "RtlMoveMemory" (Destination AS ANY, Source AS ANY, BYVAL Length AS LONG)
     Public DECLARE FUNCTION GetKeyState LIB "user32" (BYVAL nVirtKey AS LONG) AS INTEGER
     Public DECLARE FUNCTION SetWindowsHookEx LIB "user32" ALIAS "SetWindowsHookExA" (BYVAL idHook AS LONG, BYVAL lpfn AS LONG, BYVAL hmod AS LONG, BYVAL dwThreadId AS LONG) AS LONG
     Public DECLARE FUNCTION CallNextHookEx LIB "user32" (BYVAL hHook AS LONG, BYVAL nCode AS LONG, BYVAL wParam AS LONG, lParam AS ANY) AS LONG
     Public DECLARE FUNCTION UnhookWindowsHookEx LIB "user32" (BYVAL hHook AS LONG) AS LONG
     Public CONST HC_ACTION = 0
     Public CONST WM_KEYDOWN = &H100
     Public CONST WM_KEYUP = &H101
     Public CONST WM_SYSKEYDOWN = &H104
     Public CONST WM_SYSKEYUP = &H105
     Public CONST VK_TAB = &H9
     Public CONST VK_CONTROL = &H11
     Public CONST VK_ESCAPE = &H1B

     Public CONST WH_KEYBOARD_LL = 13
     Public CONST LLKHF_ALTDOWN = &H20

     Public TYPE KBDLLHOOKSTRUCT
     vkCode AS LONG
     scanCode AS LONG
     flags AS LONG
     time AS LONG
     dwExtraInfo AS LONG
     END TYPE

     DIM p AS KBDLLHOOKSTRUCT

     Public FUNCTION LowLevelKeyboardProc(BYVAL nCode AS LONG, BYVAL wParam AS LONG, BYVAL lParam AS LONG) AS LONG
     DIM fEatKeystroke AS Boolean

     IF (nCode = HC_ACTION) THEN
      IF wParam = WM_KEYDOWN OR wParam = WM_SYSKEYDOWN OR wParam = WM_KEYUP OR wParam = WM_SYSKEYUP THEN
       CopyMemory p, BYVAL lParam, LEN(p)
       fEatKeystroke = _
        ((p.vkCode = VK_TAB) AND ((p.flags AND LLKHF_ALTDOWN) <> 0)) OR _
        ((p.vkCode = VK_ESCAPE) AND ((p.flags AND LLKHF_ALTDOWN) <> 0)) OR _
        ((p.vkCode = VK_ESCAPE) AND ((GetKeyState(VK_CONTROL) AND &H8000) <> 0))
      END IF
     END IF

     IF fEatKeystroke THEN
      LowLevelKeyboardProc = -1
     ELSE
      LowLevelKeyboardProc = CallNextHookEx(0, nCode, wParam, BYVAL lParam)
     END IF
     END FUNCTION

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© Sat 2024-6-22  Guidance Laboratory Inc.
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