Using Win32 functions in Visual FoxPro Image Gallery
Code examples:
Reading VFP settings from the Windows Registry
Changing file attributes
Enumerating the subkeys for a given registry key
Displaying the associated icons and descriptions for files and folders
GDI+: Storing content of the Clipboard to a bitmap file
Obtaining some properties for the Windows desktop using the GetWindowPlacement function
Retrieving names for the registered clipboard formats
Creating a mailslot
Finding parameters for the region specified
How to initiate System shutdown
How to print FoxPro form
Reading current hardware profile
Retrieving information about the main VFP window
StrDup returns a pointer to the duplicate of a source VFP string
Using FoxTray ActiveX control: System Tray Icon and menu attached to VFP form
Placing On-screen Alert on top of all windows
Round FoxPro form
Testing serial ports
Creating the Save dialog box to specify the drive, directory, and name of a file to save
One more way to retrieve environment strings
Dial the Net Automatically
GDI+: reading and writing metadata in JPEG and TIFF files
Running MSDOS Shell as a child process with redirected input and output (smarter RUN command)
Using the CreateFile
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: 79  
    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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