Using Win32 functions in Visual FoxPro Image Gallery
Code examples:
Locking mouse and keyboard input for the VFP application
Enumerating print jobs and retrieving information for default printer (JOB_INFO_1 structures)
How to create a desktop shortcut (shell link)
How to read email messages using Simple MAPI
Monitoring changes occurring within a directory
Placing a button on the VFP form as a new child window
Displaying dimmed window behind VFP top-level form
How to display the Properties dialog box for a file (ShellExecuteEx)
Round FoxPro form
Using the SystemParametersInfo function
Adding and deleting User Accounts
How to adjust monitor brightness (Vista, monitor with DDC support)
How to print FoxPro form -- II
Retrieving names for the registered clipboard formats
Saving available locale records into a cursor
Saving local machine ODBC Registry Entries to XML file
Setting the date and time that a file was created
Switching between keyboard layouts
Using the DrawText function
Accessing examples contained in this reference from a VFP application
Adding an ODBC data source with the SQLConfigDataSource; use automatic or interactive mode
Disconnecting USB Mass Storage Device programmatically
Exporting DLL icon resources as .ICO files
How to download a file from HTTP server using URL Monikers functions
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: 56  
    Listed functions:
    CloseHandle
    CreateFile
    GetLastError
    ReadDirectoryChangesW
    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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