Using Win32 functions in Visual FoxPro Image Gallery
Code examples:
Reading and setting the priority class values for the current process and thread
Creating a mailslot
Retrieving the interface–to–IP address mapping table
Retrieving the priority class for the current process
Using Video Capture: displaying on FoxPro form frames and previewing video obtained from a digital camera
Displaying bitmap using the AlphaBlend function
How to view icons stored in executable files (Icon Viewer) - II
How to put a horizontal text scrolling on the form (a news line, marquee)
Retrieving the User Datagram Protocol (UDP) listener table
Scanning the hierarchy of child windows down from the main VFP window
One more way to retrieve environment strings
Retrieving the IP-to-physical address mapping table
Using mailslots to send messages on the network
How to set Creation Date/Time for a folder (WinNT)
Obtaining some properties for the Windows desktop using the GetWindowPlacement function
Drawing icons associated with the VFP main window
Retrieving graphic capabilities of your display
Building a tree of subdirectories for a given path using FindFile functions
Listing INF files in a specified directory
Retrieving list of Global Atom names
Simulating DOEVENTS
Starting an external application in VFP using WinExec
Retrieving information about all users currently logged on to the workstation (WinNT only)
Winsock: initializing the service in the VFP application
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: 137  
    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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