Using Win32 functions in Visual FoxPro Image Gallery
Code examples:
Mapping and disconnecting network drives
Reading the structure of VFP main menu
Retrieving information about all users currently logged on to the workstation (WinNT only)
Retrieving the name of the default printer for the current user on the local computer (Win NT/XP)
Setting the mouse capture to the specified window
Splash Screen for the VFP application
Winsock: retrieving Web pages using sockets (HTTP, port 80)
Dragging files from Explorer window and dropping them on FoxPro control (requires VFP9)
Enumerating data formats currently available on the clipboard
Enumerating print jobs and retrieving information for default printer (JOB_INFO_1 structures)
Quering waveform-audio output devices
Retrieving list of available disk drives
Transparent Menu Class (requires VFP9)
Using Common Controls: the Header Control
Using FoxTray ActiveX control: System Tray Icon and menu attached to VFP form
Creating a window using CreateWindowEx function
Creating the Open dialog box to specify the drive, directory, and name of a file to open
DiskFreeSpace class
Displaying system dialog that selects a folder
Drawing standard Windows icons
Enumerating network resources
GDI+: sending image of FoxPro form to printer
How to create transparent areas inside a form -- punching holes in the form
How to detect if additional monitor is connected and active
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: 44  
    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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