Using Win32 functions in Visual FoxPro Image Gallery
Message and Message Queue
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Detecting changes in connections to removable drives (VFP9)
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Using Video Capture: displaying on FoxPro form frames and previewing video obtained from a digital camera
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How to disable the Windows Clipboard (VFP9)

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Before you begin:

Set the checkbox and the clipboard will be disabled for all running Windows applications.

This FoxPro form is set to be notified when anything is copied to the clipboard -- text, images etc. And it clears the clipboard content on each notification.

Neither timers nor ON KEY handlers are involved.

See also:
  • How to block the PrintScreen key
  • Preventing users from accessing the Windows Desktop and from switching to other applications
  • Capturing keyboard activity of another application using the Raw Input API
  • Monitoring clipboard content changes
  • Enumerating data formats currently available on the clipboard

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    3412 bytes  
    Created: 2005-05-31 18:26:41  
    Modified: 2015-01-27 10:28:27  
    Visits in 7 days: 245  
    Listed functions:
    Printer friendly API declarations
    My comment:
    The Windows OS has a mechanism that allows to notify a window when the content of the clipboard changes.

    Not just one window can be notified but many. They are organized in a chain. The first window in this chain receives a notification and passes it to the next one, so the notification goes down to the last window registered in this chain.

    Any FoxPro window, the _screen or a form, can be registered as a Clipboard viewer -- this is how it is called. The notifications are actually window messages. And VFP9 handles window messages really good due to extended BINDEVENT() function.

    WM_CHANGECBCHAIN -- this notification is sent after a registered window has been removed from the chain of clipboard viewers.

    WM_DRAWCLIPBOARD -- this notification is sent after the content of the clipboard has changed.
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