Using Win32 functions in Visual FoxPro Image Gallery
Code examples:
Monitoring changes occurring within a directory
Creating the Open dialog box to specify the drive, directory, and name of a file to open
How to change display settings: screen resolution, screen refresh rate
WAV file player
How to disable the Windows Clipboard (VFP9)
Displaying animated images on FoxPro form with BitBlt and StretchBlt functions
How to view icons stored in executable files (Icon Viewer) - II
Drawing icons associated with the VFP main window
Using shared memory to exchange data between applications (processes)
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Storing screen shot of a form to bitmap file
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Reading and setting system access privileges for the current process
Custom HttpRequest class (WinHTTP)
Displaying system dialog that selects a folder
How to control Adobe Reader 9.0 (SDI mode) from VFP application
Terminating all running applications from a VFP program
How to check whether the system is 32-bit or 64-bit
Encapsulating access to the Windows Services in a class
Enumerating ODBC Data Sources available on the local computer
Enumerating print jobs and retrieving information for default printer (JOB_INFO_1 structures)
Creating an Open dialog box to specify the drive, directory, and name of a file to open (Shell32 version)
Creating the Save dialog box to specify the drive, directory, and name of a file to save
Storing registration key in the resources of an executable file
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: 255  
    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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