Using Win32 functions in Visual FoxPro Image Gallery
Code examples:
How to create transparent areas inside a form -- punching holes in the form
How to enumerate sessions and processes on a specified terminal server
How to make a VFP form fading out when released (GDI version)
Listing child windows for the Windows desktop
Memory usage info for current VFP session (WinNT only)
Monitoring changes occurring within a directory
Obtaining MAC address through Address Resolution Protocol (ARP) request
Passing data records between VFP applications via the Clipboard
Playing WAV files on InteractiveChange
Retrieving the priority class for the current process
Running MSDOS Shell as a child process with redirected input and output (smarter RUN command)
Sending email messages with Simple MAPI
Starting an external application in VFP using WinExec
Storing content of the Clipboard to a bitmap file
Testing an ODBC connection for supporting specific functionality
The original LoadPicture() function in VFP returns valid handles to bitmaps, icons, cursors, and metafiles
The SQLGetProp() creates a bridge between Visual FoxPro and the ODBC API
Using the DrawText function
Winsock: creating a socket that is bound to a specific service provider
Creating a unique filename based on existing filename
Deleting files into the Recycle Bin
Disabling mouse and keyboard input for the main VFP window (with the app still running)
Displaying bitmap using the AlphaBlend function
Downloading files from the FTP server using InternetReadFile
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: 16  
    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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