Using Win32 functions in Visual FoxPro Image Gallery
Code examples:
Pocket PC: custom RAPI class for operating with files and folders on mobile device
Reading the structure of VFP main menu
Passing data records between VFP applications via the Clipboard
GDI+: sending image of FoxPro form to printer
How to display the Properties dialog box for a file (ShellExecuteEx)
How to enable the SE_SHUTDOWN_NAME privilege for the application
Printing text with the Escape function
How to convert a bitmap file to monochrome format (1 bpp)
Loading a string resource from an executable file
Moving shortcut to a specified position on the Windows Desktop
CryptoAPI: Collection of Providers class
Class for sound recording
How to copy the image of a form to the Clipboard using Bitmap API functions
Using FoxTray ActiveX control: System Tray Icon and menu attached to VFP form
Using Month Calendar Control (VFP9, Comctl32.dll)
Accessing Adobe Reader 7.0 main menu from VFP application
Customizing the frame of top-level form: removing the standard frame (VFP9, Vista)
Enumerating data formats currently available on the clipboard
Extended MessageBox Class
How to put a vertical text scrolling on the form (a movie cast)
Reading and setting system access privileges for the current process
Winsock: retrieving the standard host name and IP address for the local machine
Displaying system dialog that selects a folder
How to enumerate sessions and processes on a specified terminal server
How to prevent users from accessing the Windows Desktop and from switching to other applications

User rating: 0/10 (0 votes)
Rate this code sample:
  • ~
More code examples    Listed functions    Add comment     W32 Constants      Translate this page Printer friendly version of this code sample
Versions:
click to open
Before you begin:
Sometimes you may need a computer with a single application running on it, and with all other applications and resources hidden from users. An example, Indigo Book Store customers can only search books when using public computers in the store.

The following items should be concealed:
  • Windows Taskbar and Start Menu
  • Task Manager
  • CTRL+ALT+DEL
  • ALT+TAB
  • CTRL+ESC
  • both Windows keys
  • right click on the Windows Desktop
  • all icons on the desktop
  • ...

    An article Lock Windows Desktop written by Antσnio Feijγo describes several techniques of restricting users from accessing the desktop and running other applications.

    The one that switches to a new desktop seems to be efficient, easy to understand and can be accomplished in just FoxPro code with no external libraries other than WinAPI.

    Use the following code to test the AppLauncher class:
    LOCAL obj, ex As Exception
    TRY
            obj = CREATEOBJECT("AppLauncher")
            WITH obj
                    .StartProcessInNewDesktop(;
                    "C:\Program Files\Internet Explorer\iexplore.exe",;
                     "www.universalthread.com")

                    IF .errorno <> 0
                            ? .errorno, .message
                    ENDIF
            ENDWITH

    CATCH TO ex
            ? ex.ErrorNo, ex.Message
    ENDTRY

    An Internet Explorer window will appear inside a new desktop. ALT+TAB, CTRL+ESC and CTRL+ALT+DEL keys are disabled. The Windows Taskbar and Start Menu are not visible. Close IE window to get back to the default Windows Desktop.

    Requires Win XP/NT/2K, VFP8.

    See also:
  • How to block the ALT+TAB and ALT+ESC
  • How to block the PrintScreen key
  • Using a Semaphore object to prevent VFP application from running more than one instance
  • How to start the screen saver and how to find whether the screen saver is active
  • How to disable the Windows Clipboard (requires VFP9)
  • Capturing keyboard activity of another application using the Raw Input API

  •  
      Members area. Log in to view this example.
     
      User name:
      Password:
     
     
      Forgot your password?
     
      Sign up for
    the Membership
     
     


    User rating: 0/10 (0 votes)
    Rate this code sample:
    • ~
    6034 bytes  
    Created: 2005-09-04 14:48:13  
    Modified: 2011-01-06 16:28:56  
    Visits in 7 days: 145  
    Listed functions:
    CloseDesktop
    CloseHandle
    CreateDesktop
    CreateProcess
    GetCurrentThreadId
    GetLastError
    GetThreadDesktop
    GlobalAlloc
    GlobalFree
    GlobalSize
    OpenInputDesktop
    SetThreadDesktop
    SwitchDesktop
    TerminateProcess
    WaitForSingleObject
    Printer friendly API declarations
    My comment:
    To implement this technique, create a launcher -- a small VFP application that starts the main executable by calling the CreateProcess API function.

    Name of the new desktop is assigned to lpDesktop member of the STARTUPINFO structure that used with the CreateProcess call. As the result, the main application runs inside a separate desktop, which is absolutely empty.

    The WaitForSingleObject function returns, when the main application is closed by user. Also this function returns when the time-out interval elapses, unless dwMilliseconds is INFINITE.

    * * *
    A window station is a securable object that is associated with a process, and contains a clipboard, an atom table, and one or more desktop objects.

    The interactive window station, WinSta0, is the only window station that can display a user interface or receive user input. It is assigned to the logon session of the interactive user, and contains the keyboard, mouse, and display device. All other window stations are noninteractive, which means they cannot display a user interface or receive user input.

    A desktop is a securable object contained within a window station. A desktop has a logical display surface and contains user interface objects such as windows, menus, and hooks.

    * * *
    C++ code shows how to enumerate window stations and window desktops. The enumerations are based on callback functions and for that reason can not be programmed directly in VFP code.

    EnumWindowStationProc
    Word Index links for this example:
    Translate this page:
      Spanish    Portuguese    German    French    Italian  
    FreeTranslation.com offers instant, free translations of text or web pages.
    User Contributed Notes:
    There are no notes on this subject.


    Copyright © 2001-2017 News2News, Inc. Before reproducing or distributing any data from this site please ask for an approval from its owner. Unless otherwise specified, this page is for your personal and non-commercial use. The information on this page is presented AS IS, meaning that you may use it at your own risk. Microsoft Visual FoxPro and Windows are trade marks of Microsoft Corp. All other trademarks are the property of their respective owners. 

    Privacy policy
    Credits: PHP (4.4.9), an HTML-embedded scripting language, MySQL (5.6.38), the Open Source standard SQL database, AceHTML Freeware Version 4, freeware HTML Editor of choice.   Hosted by Korax Online Inc.
    Last Topics Visited (54.162.139.105)
    14 sec.Example: 'Retrieving graphic capabilities of your display'
    27 sec.Function: 'EnumPorts'
    39 sec.Example: 'A client for testing non-blocking Winsock server'
    51 sec.Function: 'CreatePipe'
    1.03 min.Function: 'GetWindowRect'
    Function group: 'Window'
    1.23 min.Function: 'timeGetDevCaps'
    Function group: 'Windows Multimedia'
    Google
    Advertise here!