Using Win32 functions in Visual FoxPro Image Gallery
Code examples:
How to change display settings: screen resolution, screen refresh rate
Capturing keyboard activity of another application with the Raw Input API (VFP9)
Converting Unicode data from the Clipboard to a character string using a given code page
Copying picture of the active form to the Clipboard using Enhanced Metafile API functions
Enumerating data formats currently available on the clipboard
Obtaining current Internet Explorer browser version and UserAgent
Enumerating raw input devices attached to the system (keyboard, mouse, human interface device)
How to print FoxPro form
GDI+: copying to the Clipboard (a) image of active FoxPro window/form, (b) image file
Creating a clipping region from the path selected into the device context of a form
Storing content of the Clipboard to a bitmap file
FindText -- the hopeless and useless Common Dialog
How to create transparent areas inside a form -- punching holes in the form
Enumerating Processes -- WinNT
Using EnumPrinters function to enumerate locally installed printers
Placing a button on the VFP form as a new child window
Retrieving the name of the primary domain controller (PDC) and join status information
A procedure for setting file times
Storing screen shot of a form to bitmap file
Using the DeleteFile
Disabling mouse and keyboard input for the main VFP window (with the app still running)
Using the Semaphore object to allow only one instance of VFP application running
How to print a bitmap file
Attaching menu to a top-level form
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: 138  
    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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