How can I invalidate Copy and Paste options in Windows?

[Agustin Tristan-Lopez]

I need to cancel the possibility to Copy and Paste what is on the screen, for security of the data that is displayed on the screen.
How can I invalidate the Ctrl-C, Ctrl-V in the keyboard or the right button in the mouse for copy and paste?



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[Semen Matusovski]

Under Win2000 this exactly works, under another OSes - not tested, but should work also.

   #Compile Exe
   #Dim All
   #Register None
   #Include "Win32Api.Inc"
   CallBack Function DlgProc
      Dim hwndNextViewer As Static Long, hData As Asciiz Ptr, Active As Static Long
      Select Case CbMsg
         Case %WM_ACTIVATEAPP
            If CbWparam Then SetWindowText CbHndl, "Clipboard doesn't work": Active = 1 Else _
                             SetWindowText CbHndl, "Clipboard works": Active = 0
         Case %WM_INITDIALOG
            hwndNextViewer = SetClipboardViewer(CbHndl)
         Case %WM_CHANGECBCHAIN
            If CbWparam = hwndNextViewer Then hwndNextViewer = CbLparam Else _
            If hwndNextViewer <> 0 Then SendMessage hwndNextViewer, CbMsg, CbWparam, CbLparam
         Case %WM_DESTROY
            ChangeClipboardChain CbHndl, hwndNextViewer
         Case %WM_DRAWCLIPBOARD
            If Active Then
               If OpenClipBoard(0) Then EmptyClipBoard: CloseClipboard
               SendMessage hwndNextViewer, CbMsg, CbWparam, CbLparam
            End If
      End Select
   End Function
   Function PbMain
      Local hDlg As Long
      Dialog New 0, "Test", ,, 300, 200, %WS_CAPTION Or %WS_SYSMENU, %WS_EX_TOPMOST To hDlg
      Dialog Show Modal hDlg Call DlgProc
   End Function

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