Using Win32 functions in Visual FoxPro Image Gallery
Code examples:
Drawing Windows predefined bitmaps using the LoadBitmap functions
How to print a bitmap file
System Image List Viewer
Testing serial ports
The window and its ancestors
Enumerating print jobs and retrieving information for default printer (JOB_INFO_1 structures)
How to delete all print jobs for a printer
How to draw custom Window Caption on FoxPro form
Placing a button on the VFP form as a new child window
Pocket PC: custom RAPI class for operating with files and folders on mobile device
Retrieving file information for the VFP executable running
Using shared memory to exchange data between applications (processes)
Winsock: reading email messages (POP3, port 110)
Winsock: retrieving Web pages using sockets (HTTP, port 80)
How to download a file from the FTP server using FtpGetFile
How to print FoxPro form -- II
How to run FoxPro application under different user name (impersonating user)
Locking and unlocking file of a VFP table
Current keyboard type
Getting a bit more than the _CLIPTEXT offers
Retrieving list of files on the FTP directory
Using the NetMessageBufferSend to send messages on the network
Drawing a window caption using the DrawCaption routine
How to disable the Windows Clipboard (VFP9)
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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