Using Win32 functions in Visual FoxPro Image Gallery
Code examples:
List of addresses in the AutoDial mapping database
Obtaining Shell32.dll version
Disabling mouse and keyboard input for the main VFP window (with the app still running)
Quering a waveform-audio input device
Retrieveing information about the active window (even if it is not owned by the calling process)
Retrieving current user for the process
Retrieving Network Provider information
The original LoadPicture() function in VFP returns valid handles to bitmaps, icons, cursors, and metafiles
Using GetCompressedFileSize (WinNT only)
Using the SetErrorMode for determining if a floppy drive is ready
Enhanced GetFont dialog
Obtaining window class name for the main VFP window
Power capabilities of the system: battery, UPS, sleep and hibernation modes, processor throttling
Quering waveform-audio output devices
Retrieving configuration information for the specified server (Win2000/XP)
Retrieving current settings for an ODBC connection
Converting an integer value to a hexadecimal string
Enumerating MIDI output devices
GDI+: converting text strings to images and saving in a graphics file
Simulating DOEVENTS
Managing Cookies
Winsock: retrieving information about available transport protocols
Converting characters to upper or lower case
Setting the last-error code for the FoxPro
Using an Event Object. Part B: running an application responding to events

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Before you begin:
Compile this code into a separate executable and test with an executable created from the Part A of this example. This is the name of the Event Object, that links two parts.

Start Part A executable prior to the Part B.
PUBLIC frm, lcEventName
lcEventName = "TimeToGoHomeNotice"

frm = CreateObject ("Tform", lcEventName)
IF TYPE ("frm") = "O"
    frm.Visible = .T.
    READ EVENTS
ENDIF

DEFINE CLASS Tform As Form
#DEFINE watchingInterval  500

    Width=400
    Height=150
    Caption="Responding to events"
    BackColor=Rgb(230,250,230)
    AutoCenter=.T.
    hEvent=0

    ADD OBJECT tm As Timer WITH Interval=0

PROCEDURE  Init (lcName)
    DO decl

    _SCREEN.WindowState = 2
    _SCREEN.Caption = "Event Client"

    IF Not THIS.checkEvent(lcName)
        = MessageB ("Unable to locate the event: " + lcName)
        RETURN .F.
    ENDIF
    THIS.tm.Interval = watchingInterval

PROCEDURE  Destroy
    QUIT

PROCEDURE  tm.Timer
    IF ThisForm._signaled()
        ThisForm._notify
    ENDIF

PROCEDURE  checkEvent (lcName)
#DEFINE STANDARD_RIGHTS_REQUIRED  0xF0000 
#DEFINE SYNCHRONIZE  0x100000 

* STANDARD_RIGHTS_REQUIRED Or SYNCHRONIZE Or 0x03
#DEFINE EVENT_ALL_ACCESS 0x1F0003

    THIS.hEvent = OpenEvent (EVENT_ALL_ACCESS, 0, lcName)
RETURN  Not (THIS.hEvent = 0)

PROCEDURE  _notify
#DEFINE SW_NORMAL  1
#DEFINE SW_SHOWMAXIMIZED 3

    * make this window active
    _SCREEN.WindowState = 1
    _SCREEN.WindowState = 2

    = MessageB ("Wake Up! It is time to go home.")
    THIS.tm.Interval = watchingInterval

PROCEDURE  _signaled
#DEFINE INFINITE  0xffffffff
#DEFINE WAIT_OBJECT_0           0

    LOCAL dwWaitResult
    dwWaitResult = WaitForSingleObject (THIS.hEvent, 0)

    IF dwWaitResult = WAIT_OBJECT_0
        = ResetEvent (THIS.hEvent)
        THIS.tm.Interval = 0
        RETURN .T.
    ENDIF
RETURN .F.

ENDDEFINE

PROCEDURE  decl
    DECLARE INTEGER OpenEvent IN kernel32;
        INTEGER dwDesiredAccess,;
        INTEGER bInheritHandle,;
        STRING  lpName

    DECLARE INTEGER ResetEvent IN kernel32 INTEGER hEvent

    DECLARE INTEGER WaitForSingleObject IN kernel32;
        INTEGER hHandle,;
        INTEGER dwMilliseconds


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1878 bytes  
Created: 2001-09-16 12:00:00  
Modified: 2005-12-27 10:34:41  
Visits in 7 days: 75  
Listed functions:
OpenEvent
ResetEvent
WaitForSingleObject
Printer friendly API declarations
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