Using Win32 functions in Visual FoxPro Image Gallery
Code examples:
Using Change Notification Objects to monitor changes to the printer or print server
Winsock: retrieving directory listing from an FTP server using passive data connection (FTP, port 21)
Displaying system dialog that selects a folder
Enumerating network resources
How to disable the Windows Clipboard (VFP9)
How to play MIDI notes
Moving shortcut to a specified position on the Windows Desktop
Placing On-screen Alert on top of all windows
Running a regular FoxPro form while main VFP window is minimized
The DetectAutoProxyUrl function identifies the auto-config script location
Using FillMemory
Using the SystemParametersInfo function
GDI+: Scrolling through large image using the mouse
Pocket PC: Folder Viewer
URL: splitting into its component parts
Confining Windows calculator inside the VFP main window
Disabling mouse and keyboard input for the main VFP window (with the app still running)
Displaying animated images on FoxPro form with BitBlt and StretchBlt functions
GDI+: enumerating fonts installed on the system
How to set Creation Date/Time for a folder (WinNT)
StrDup returns a pointer to the duplicate of a source VFP string
Detecting changes in connections to removable drives (VFP9)
Disconnecting USB Mass Storage Device programmatically
Enhanced GetFont dialog
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: 22  
    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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