How to block the PrintScreen key -- Visual FoxPro : Using Win32 (WinAPI) Functions


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How to block the PrintScreen key

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Before you begin:

The PrintScreen key sends to the Clipboard either whole screen or just the active window (if pressed together with ALT key). To prevent windows of your application to be captured and printed by users through pressing this key, use RegisterHotKey API function.

Still this solution does not provide absolute protection, if there is such a thing :). A determined user may use third-party screen capturing utility that is not associated with the PrintScreen key and the Clipboard.

See also:

How to block the ALT+TAB shortcut

How to disable the Windows Clipboard (requires VFP9)

Preventing users from accessing the Windows Desktop and from switching to other applications

Capturing keyboard activity of another application using the Raw Input API


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3106 bytes
Created: 2005-07-25 12:15:33
Modified: 2011-12-10 09:20:22
Visits in 7 days: 148

Listed functions:

CallWindowProc
GetFocus
GetLastError
GetWindowLong
RegisterHotKey
UnregisterHotKey
WindowProc

My comment:

Under VFP8 the code works in a bit limited way. It does disable the PrintScreen key, but the OnPrintScreen method of the form can not be binded to the WM_HOTKEY notification.

* * *
Read article Disabling Print Screen, Calling Derived Destructors, and More by Paul DiLascia published in Nov.2005 MSDN Magazine.

#DEFINE IDHOT_SNAPDESKTOP -2
#DEFINE IDHOT_SNAPWINDOW -1

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