Using Win32 functions in Visual FoxPro Image Gallery
Code examples:
Creating a console window for Visual FoxPro application
Dragging files from Explorer window and dropping them on FoxPro control (requires VFP9)
Reading and setting the priority class values for the current process and thread
Using the Semaphore object to allow only one instance of VFP application running
GDI+: custom Clock Control
How to download this reference`s archive through WinInet functions using InternetOpenUrl
Confining Windows calculator inside the VFP main window
Drawing a window caption using the DrawCaption routine
Encapsulating access to the Windows Services in a class
How to make a VFP form fading out when released (GDI version)
How to prevent users from accessing the Windows Desktop and from switching to other applications
How to read email messages using Simple MAPI
How to view icons stored in executable files (Icon Viewer)
Monitoring changes in a directory
Reading security permissions for NTFS files and folders
Reading VFP settings from the Windows Registry
Retrieving list of available disk drives
Scanning the hierarchy of child windows down from the main VFP window
Using Path functions from Shell Lightweight Utility APIs (shlapi.dll)
Using the CreateFile
Enumerating files opened on the network
GDI+: converting image file to another graphics format
How to ping a remote site using ICMP API calls
Reading and setting Environment variables
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: 50  
    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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