i've seen several references (see LockWindowUpdate, RedrawWindow, and InvalidateRect) to locking the screen whilst preforming behind the scenes action, but never a function so here goes.
1) place both files cloakTest.ahk and cloak.ahk. into a folder.
2) run cloakTest.ahk.
3) press f12 (more than once) and see what happens.
also try it with different flags. in some cases you can get by without the include ALLCHILDREN flag, but not in this case.
note-1: i have found sending keys to be more reliable than clicking buttons.
note-2: if you lock the screen use ctrl+alt+delete then cancel to get back control.
note-3: tested on win2k
Code:
; cloak.ahk
;
; usage:
; cloak() ; lock screen
; do something
; cloak(0) ; unlock screen
;
; default, cloak(), uses the flags listed below. in some cases
; you can get better results using cloak(0x505) experiment.
;
; note: cloaks may be nested
;
cloak(f = 0x585) { ; RDW_FRAME = 0400h
static rdf, dhw, clk = 0 ; RDW_UPDATENOW = 0100h
if f { ; RDW_ALLCHILDREN = 0080h
if !clk { ; RDW_ERASE = 0004h
rdf := f ; RDW_INVALIDATE = 0001h
dhw := a_detectHiddenWindows
detectHiddenWindows on
dt_h := dllCall("GetDesktopWindow")
sendMessage 0xB,,,, ahk_id %dt_h% ; redraw off
}
clk++ ; for nesting
} else if clk {
clk--
if !clk {
dt_h := dllCall("GetDesktopWindow")
sendMessage 0xB, 1,,, ahk_id %dt_h% ; redraw on
dllCall("RedrawWindow", uint, 0, uint, 0, uint, 0, int, rdf)
detectHiddenWindows %dhw%
}
}
return clk
}
;
; helper function you may or may not find useful
; sends <keys> to the window <tlt>, <txt>
; returns 1 if the keys were sent or 0 if there was a problem
;
waitNsend(keys, tlt, txt = "") {
winWait %tlt%, %txt%, 2
if !errorLevel {
winActivate
winWaitActive ,,, 2
if !errorLevel
sendInput %keys%
}
return !errorLevel
}
;
test file. be sure to name it cloakTest.ahk
Code:
; cloakTest.ahk
;
#singleInstance force
;
run notepad
;
state = 0
#ifWinActive ahk_class Notepad
f12::
f = cloakTest.ahk
if state {
cloak() ; default --> include ALLCHILDREN
;cloak(0x505) ; try different flags & see what happens ;}
f = cloak.ahk
}
sendInput !fo
winWaitActive Open ahk_class #32770,, 5
if !errorlevel {
sendInput %A_ScriptDir%\%f%{enter}
winWaitClose ,,, 2
}
cloak(0)
state := !state
return
;
#include %a_scriptDir%
#include cloak.ahk
;
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