Using Win32 functions in Visual FoxPro Image Gallery
Code examples:
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Placing a button on the VFP form as a new child window
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Reading and setting the priority class values for the current process and thread
Writing entries to custom Event Log
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Adding and deleting Scheduled Tasks using NetScheduleJob API functions
Class library providing access to the System Registry
Getting a bit more than the _CLIPTEXT offers
How to change the name and the size of the font in the MessageBox dialog
Monitoring changes in a directory
Retrieving information about the main VFP window
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Transparent Menu Class (requires VFP9)
Using WM_COPYDATA for interprocess communication (VFP9)
Dragging files from Explorer window and dropping them on FoxPro control (requires VFP9)
Reading list of folders and files on FTP server
Winsock: retrieving Web pages using sockets (HTTP, port 80)
Monitoring changes occurring within a directory

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Before you begin:
To stop the following code after it has been started, open and save any file in C:\TEMP directory.

See also:
  • FileSystemWatcher ActiveX Control for Visual FoxPro
  • Monitoring changes in a directory
  • Enumerating files opened on the network
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    1841 bytes  
    Created: 2003-05-09 09:16:21  
    Modified: 2011-02-16 13:28:54  
    Visits in 7 days: 84  
    Listed functions:
    Printer friendly API declarations
    My comment:
    To stop the following code after it has been started, open and save any file in C:\TEMP directory.

    * * *
    The C++ sample displays file and directory changes for drive C in a console window. Close the window when you no longer need it.

    This code itself makes an interesting tool. Download C++ project, compile and start the executable. Then open VFP or IE window, or even move the mouse above the Windows taskbar -- you will see how many files and directory modifications may hide behind such a simple action.

    * * *
    Deleting a directory with subdirectories into the Recycle Bin produces a single FILE_NOTIFY_INFORMATION structure with the directory data. While a direct delete (the Recycle Bin is bypassed) triggers ReadDirectoryChangesW for each subdirectory, and finally for the directory.

    * * *
    When designing a file monitoring utility (FLL or ActiveX control), it should be considered that VFP creates single threaded applications.

    While busy with processing directory changes, an application is unable to receive other changes coming. Frequent changes and substantial processing time make such miss unavoidable.

    Thus a VFP application must receive not the actual directory changes, but rather be notified when they occur. Notifications may come through window messages or by events raised.

    A monitoring utility must take care of piling changes in its own memory, and dispatching them to a client application upon request.
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