Using Win32 functions in Visual FoxPro Image Gallery
Keyboard Input
..msdn
ActivateKeyboardLayout
BlockInput
EnableWindow
GetActiveWindow
GetAsyncKeyState
GetFocus
GetKBCodePage
GetKeyboardLayout
GetKeyboardLayoutList
GetKeyboardLayoutName
GetKeyboardState
GetKeyNameText
GetKeyState
IsWindowEnabled
keybd_event
MapVirtualKey
RegisterHotKey
SetFocus
SetKeyboardState
ToAscii
UnregisterHotKey
VkKeyScan
Code examples:
Adding an ODBC data source with the SQLConfigDataSource; use automatic or interactive mode
Bitmap Class for Visual FoxPro application
Comparing dimensions of the VFP main window with _SCREEN properties
Configuring DEVMODE structure for a printer
Confining Windows calculator inside the VFP main window
Creating a window using CreateWindowEx function
Creating an Open dialog box to specify the drive, directory, and name of a file to open (Shell32 version)
Creating the Open dialog box to specify the drive, directory, and name of a file to open
Creating the Save dialog box to specify the drive, directory, and name of a file to save
Deleting files into the Recycle Bin
Displaying bitmap using the AlphaBlend function
Displaying printer-properties Property Sheet for the specified printer
Displaying system dialog that selects a folder
Drawing a rectangle using Windows regular edges and borders
Drawing a window caption using the DrawCaption routine
Drawing cursors for the classes defined by the system (preregistered): BUTTON, EDIT, LISTBOX etc.
Drawing icons associated with the VFP main window
Drawing Windows frame controls using the DrawFrameControl function
Drawing Windows predefined bitmaps using the LoadBitmap functions
Establishing connection using the SQLDriverConnect
Extended MessageBox Class
FindText -- the hopeless and useless Common Dialog
Form Magnifier
GetFocus returns a HWND value
Getting a bit more than the _CLIPTEXT offers
How to browse and connect to printers on a network (WinNT)
How to change the name and the size of the font in the MessageBox dialog
How to copy the image of a form to the Clipboard using Bitmap API functions
How to display a dialog box with which the user can add a data source (DSN)
How to display picture stored in enhanced-format metafile (*.emf)
How to display the port-configuration dialog box for a port on the specified server
How to display the Properties dialog box for a file (ShellExecuteEx)
How to make the caption of a VFP application flashing in the Windows task bar
How to play AVI file on the _screen
How to position the GETPRINTER() dialog
How to print a bitmap file
How to print picture stored in enhanced-format metafile (*.emf)
How to put a horizontal text scrolling on the form (a news line)
How to put a vertical text scrolling on the form (a movie cast)
How to remove a directory that is not empty
Initiating Inet connection using a modem
Locking mouse and keyboard input for the VFP application
Minimizing all running applications
Obtaining the bounding rectangle for the specified device context
Obtaining window class name for the main VFP window
Placing an arbitrary rectangular area of main VFP window on the Clipboard
Printing text on the client area of the main VFP window
Printing text on the main VFP window
Reading metrics for the currently selected font
Reading the structure of VFP main menu
Retrieving information about the main VFP window
Retrieving long values associated with the class of the VFP window
Retrieving Window Class information for the VFP window
Scanning the hierarchy of child windows down from the main VFP window
Sending a standard message with one or more attached files using default email client
Setting the mouse capture to the specified window
Simple MAPI: how to pick an email recipient from Outlook Express address book
Splash Screen for the VFP application
Starting a dialog box for connecting to network resources (mapping network drive)
Storing content of the Clipboard to a bitmap file
Terminating all running applications from a VFP program
Testing Clipboard functions: emptying the clipboard
The window and its ancestors
Using FlashWindowEx to flash the taskbar button of the VFP application
Using Font and Text functions
Using GetNearestColor
Using InternetGoOnline function
Using IsChild() for testing ThisForm.ShowWindow property
Using the ChooseColor function
Using the DrawText function
Using the GradientFill function
Using the IsWindowEnabled function
Using the LoadImage function to have a bitmap file loaded and displayed on VFP main window
Using the MessageBox Win32 function
Using the RestartDialog function -- restarting Windows
Who is the first in viewing the Clipboard
Who owns the Windows Clipboard
Minimizing all running applications

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More code examples    Listed functions    Add comment     W32 Constants      Translate this page Printer friendly version of this code sample
Before you begin:
It is almost the same if you would select the Minimize All Windows command from the Windows toolbar menu.
 
DO decl
LOCAL hWinActive, hWindow, lcWinText, hWinCount, lnWinIndex
hWinActive = GetActiveWindow()
hWindow = -1
hWinCount = 0
 
#DEFINE GW_HWNDFIRST  0
#DEFINE GW_HWNDLAST   1
#DEFINE GW_HWNDNEXT   2
 
DO WHILE hWindow <> GetWindow (hWinActive, GW_HWNDLAST)
    IF hWindow = -1
        hWindow = GetWindow(hWinActive, GW_HWNDFIRST)
    ELSE
        hWindow = GetWindow(hWindow, GW_HWNDNEXT)
    ENDIF
 
    IF IsWindow(hWindow) <> 0;
        And IsWindowVisible(hWindow) <> 0;
        And GetWindowTextLength(hWindow) > 0
 
        lcWinText = GetWinText(hWindow)
 
        * storing suitable window handles to an array
        IF Not "Program Manager" $ lcWinText
            hWinCount = hWinCount + 1
            DIMEN arrWin[hWinCount]
            arrWin[hWinCount] = hWindow
        ENDIF
    ENDIF
ENDDO
 
FOR lnWinIndex=1 TO hWinCount
    If IsIconic(arrWin[lnWinIndex]) = 0
        = CloseWindow(arrWin[lnWinIndex])
    ENDIF
ENDFOR
* end of main
 
FUNCTION  GetWinText(hWindow)
    LOCAL lnBufsize, lcBuffer
    lnBufsize = 1024
    lcBuffer = Repli(Chr(0), lnBufsize)
    lnBufsize = GetWindowText(hWindow, @lcBuffer, lnBufsize)
RETURN  Iif(lnBufsize=0, "", Left(lcBuffer,lnBufsize))
 
PROCEDURE  decl
    DECLARE INTEGER GetActiveWindow  IN user32
    DECLARE INTEGER GetWindow IN user32 INTEGER hwnd, INTEGER wFlag
    DECLARE INTEGER IsWindow IN user32 INTEGER hWnd
    DECLARE INTEGER IsWindowVisible IN user32 INTEGER hWnd
    DECLARE INTEGER GetWindowTextLength IN user32 INTEGER hWnd
 
    DECLARE INTEGER GetWindowText IN user32;
        INTEGER hwnd, STRING @lpString, INTEGER cch
 
    DECLARE INTEGER CloseWindow IN user32 INTEGER hWnd
    DECLARE INTEGER IsIconic IN user32 INTEGER hWnd
 
 
 

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1614 bytes  
Created: 2002-01-10 18:25:51  
Modified: 2008-12-03 15:26:21  
Visits in 7 days: 81  
Listed functions:
CloseWindow
GetActiveWindow
GetWindow
GetWindowText
GetWindowTextLength
IsIconic
IsWindow
IsWindowVisible
Printer friendly API declarations
My comment:
The GetWindow is used to obtain handles to all windows siblings to the main VFP window, excluding the Program Manager window.

Then the CloseWindow is applied to every handle to minimize the window. This name is quite obscure, because the windows are in fact minimized not being closed by this function.

Compare with the DestroyWindow. This name gives a clear idea of what this function really does.

See also:
Microsoft Help and Support: How to re-create the Show Desktop icon on the Quick Launch bar
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