Using Win32 functions in Visual FoxPro Image Gallery
Code examples:
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GDI+: Storing content of the Clipboard to a bitmap file
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Custom GDI+ class
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Printing Image File, programmatically set print page orientation to landscape
Adding a background image to VFP report (VFP9, ReportListener)
Using WM_COPYDATA for interprocess communication (VFP9)
Enumerating raw input devices attached to the system (keyboard, mouse, human interface device)
Mapping and disconnecting network drives
Custom HttpRequest class (WinHTTP)
How to detect if additional monitor is connected and active
Using EnumPrinters function to enumerate locally installed printers
HOWTO: Use the Win32 API to Access File Dates and Times
Using Video Capture: displaying on FoxPro form frames and previewing video obtained from a digital camera
Retrieving configuration information for the specified workstation (Win2000/XP)
How to copy the image of a form to the Clipboard using Bitmap API functions
How to register custom Event Log source
Using FoxTray ActiveX control: System Tray Icon and menu attached to VFP form
Windows Shell Icons displayed and exported to ICO files (Vista)
Disconnecting USB Mass Storage Device programmatically
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
  • using System;
    using System.IO;
    
    namespace DirectoryWatcher
    {
        class Program
        {
            static void Main(string[] args)
            {
                FileSystemWatcher fsw = new FileSystemWatcher();
    
                fsw.Changed += 
                    new FileSystemEventHandler(fsw_Changed);
    
                fsw.Created +=
                    new FileSystemEventHandler(fsw_Changed);
    
                fsw.Deleted +=
                    new FileSystemEventHandler(fsw_Changed);
    
                fsw.Renamed +=
                    new RenamedEventHandler(fsw_Renamed);
    
                fsw.IncludeSubdirectories = true;
    
                fsw.NotifyFilter = NotifyFilters.LastAccess | 
                    NotifyFilters.LastWrite | 
                    NotifyFilters.FileName | 
                    NotifyFilters.DirectoryName;
    
                try
                {
                    //make sure the target path can be accessed
                    fsw.Path = @"c:\temp";
                    fsw.EnableRaisingEvents = true;
                }
                catch (ArgumentException ex)
                {
                    Console.WriteLine(
                        "Invalid argument: " + ex.Message);
                }
                catch (Exception ex)
                {
                    Console.WriteLine(
                        "Exception: " + ex.Message);
                }
    
                Console.ReadKey();
            }
    
            static void fsw_Renamed(object sender, RenamedEventArgs e)
            {
                Console.WriteLine(e.ChangeType + ": " + 
                    e.OldFullPath + " to " + e.FullPath);
            }
    
            static void fsw_Changed(object sender, FileSystemEventArgs e)
            {
                Console.WriteLine(e.ChangeType + ": " + e.FullPath);
            }
    
        }
    }
    

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    1731 bytes  
    Created: 2003-05-09 09:16:21  
    Modified: 2011-02-16 13:28:54  
    Visits in 7 days: 68  
    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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