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Code examples:
High-powered ALLTRIM
How to find the application associated with a file name
Retrieving local computer and user names
Using the IsWindowEnabled function
Exporting DLL icon resources as .ICO files
How to delete all print jobs for a printer
Obtaining Shell32.dll version
Retrieveing general information about the driver and data source associated with an ODBC connection
Testing if a connection to an Url can be established
Testing MS Internet Explorer version installed
Using NetWkstaTransportEnum to obtain MAC Address of remote server
How to block the ALT+TAB shortcut (WinXP)
How to display Windows On-Screen Keyboard
Reading the structure of VFP main menu
Semi-transparent Form
GDI+: saving image of FoxPro form to graphics file (BMP, GIF, JPG, PNG, TIF)
How to retrieve adapter information for the local computer (including MAC address)
Retrieving the interface–to–IP address mapping table
Enumerating global and local group accounts on a server (WinNT/XP/2K)
Enumerating ports that are available for printing on a specified server
How to create a desktop shortcut (shell link)
How to view icons stored in executable files (Icon Viewer)
Monitoring changes occurring within a directory
Obtaining some properties for the Windows desktop using the GetWindowPlacement function


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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: 147  
    Listed functions:
    CallWindowProc
    GetFocus
    GetLastError
    GetWindowLong
    RegisterHotKey
    UnregisterHotKey
    WindowProc
    		Printer friendly API declarations
    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
    Word Index links for this example:
    Clipboard
    VFP9
    keyboard
    windows desktop
    notification
    active window
    VFP8
    Windows Clipboard
    PrintScreen
    ALT+TAB
    WM_HOTKEY
    raw input
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