Using Win32 functions in Visual FoxPro Image Gallery
Message and Message Queue
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BroadcastSystemMessage
GetQueueStatus
MQCloseQueue
MQDeleteQueue
MQHandleToFormatName
MQOpenQueue
MQPathNameToFormatName
MQPurgeQueue
PeekMessage
PostMessage
PostQuitMessage
SendMessage
Code examples:
Accessing Adobe Reader 7.0 main menu from VFP application
Browsing Windows Known Folders (Special Folders)
Controlling master audio volume by sending WM_APPCOMMAND messages
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Detecting changes in connections to removable drives (VFP9)
Displaying hypertext links with the SysLink control (VFP9, Comctl32.dll)
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Enumerating devices installed on the local machine
Extended MessageBox Class
How to change the name and the size of the font in the MessageBox dialog
How to control Adobe Reader 9.0 (SDI mode) from VFP application
How to disable the Windows Clipboard (VFP9)
How to drag a Form not using its Titlebar or Caption
How to draw custom Window Caption on FoxPro form
How to start the screen saver and how to find whether the screen saver is active
How to view icons stored in executable files (Icon Viewer) - II
How to view system icons for the classes installed on the local machine
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Round FoxPro form
System Image List Viewer
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Using Month Calendar Control (VFP9, Comctl32.dll)
Using Video Capture: displaying on FoxPro form frames and previewing video obtained from a digital camera
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Windows Shell Icons displayed and exported to ICO files (Vista)
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:
    CallWindowProc
    ChangeClipboardChain
    GetWindowLong
    SendMessage
    SetClipboardViewer
    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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