Disable PrintScreen key to prevent conventional screendumps?

[Wayne Diamond]

Is this possible? I remember that Netbus can disable keys, so that part is at least possible, but is it possible to block (or remap?) the PrintScreen key as to prevent conventional screendumps?


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[Semen Matusovski]

wayne -- http://www.powerbasic.com/support/pb...ad.php?t=17624
in hotkey sample it's necessary to add processing alt-prtsc, ctrl-prtsc, shift-prtsc.
setclipboardviewer is also could be useful - http://www.powerbasic.com/support/pb...ead.php?t=2786


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[Wayne Diamond]

wooohooo!! that code works perfectly to block the screen dump - very nice
thanks Semen - I searched POFFS but the link was too new (nudge nudge Borje, nudge nudge )
it has also introduced me to the GlobalAddAtom and RegisterHotKey calls... hmm
it doesn't block Alt+PrintScreen though...


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[Semen Matusovski]

Originally posted by Wayne Diamond:
it doesn't block Alt+PrintScreen though...

Wayne --
I don't see this under Win2000.

   #Compile Exe
   #Register None
   #Dim All
   #Include "Win32Api.Inc"
   %ID_Text = 201

   CallBack Function DlgProc
      Dim nAtom(15) As Static Dword, i As Long
      Select Case CbMsg
         Case %WM_INITDIALOG
            For i = 0 To 15
               nAtom(i) = GlobalAddAtom ("My Hotkey" + Str$(i) + Str$(Timer))
               RegisterHotKey CbHndl, nAtom(i), i, %VK_SNAPSHOT
            Next
            SetTimer CbHndl, 1, 5000, ByVal 0
        Case %WM_DESTROY
            For i = 0 To 15
               UnregisterHotKey CbHndl, nAtom(i)
               GlobalDeleteAtom nAtom(i)
            Next
        Case %WM_HOTKEY ' CbWparam = nAtom
           ShowWindow CbHndl, 1
           SetTimer CbHndl, 1, 3000, ByVal 0
           Control Set Text CbHndl, %ID_TEXT, "x-PrtSc pressed at " + Time$
        Case %WM_TIMER
           KillTimer CbHndl, 1: ShowWindow CbHndl, 0
     End Select
  End Function

  Function PbMain
     Local hDlg As Long
     Dialog New 0, "HotKey (Print Screen)",,, 300, 40, %WS_SYSMENU, _
        %WS_EX_TOPMOST Or %WS_EX_TOOLWINDOW To hDlg
     Control Add Label, hDlg, %ID_Text, "Press Print Screen in another apps or Close this dialog", _
        5, 10, 290, 15, %SS_CENTER
     Dialog Show Modal hDlg Call DlgProc
  End Function

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[Wayne Diamond]

PERFECT!!! That now detects PrintScr, Ctrl+PrintScr, Shift+PrintScr and Alt+PrintScr - doesn't get any better than that!
many thanks again Semen


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[Wayne Diamond]

i was just playing around more with that sample - if you change %VK_SNAPSHOT to %VK_F4 you can block Alt+F4 from killing your program
you rock my world Semen


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[Eric Pearson]

Wayne --

Be careful that you're not disabling the ability to use Alt-F4 to close any program!

There are easier/better ways to keep Alt-F4 (and the Close button, double-clicking on the title bar icon, etc.) from closing your programs...

-- Eric

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[Semen Matusovski]

I agree with Eric. Correct way is

   #Compile Exe
   #Register None
   #Dim All
   #Include "WIN32API.INC"

   CallBack Function DlgProc
      Select Case CbMsg
         Case %WM_SYSCOMMAND: If LoWrd(CbWparam) = %SC_CLOSE Then Function = 1
         Case %WM_COMMAND: If CbCtl = %IDOK Then Dialog End CbHndl
      End Select
   End Function

   Function PbMain
     Dim hDlg As Long
     Dialog New hDlg, "Test", , , 100, 100, %WS_OVERLAPPEDWINDOW Or %WS_CAPTION To hdlg
     Control Add Button, hDlg, %IDOK, "End", 10, 10, 80, 15
     DeleteMenu GetSystemMenu(hDlg, 0), %SC_CLOSE, %MF_BYCOMMAND ' Not important
     Dialog Show Modal hDlg Call DlgProc
   End Function

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[Wayne Diamond]

Eric - good point... I forgot that GlobalAtoms were global for a moment
Semen - cute demo! Ive saved that to my samples directory, im sure it will come in very handy soon



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