Using Win32 functions in Visual FoxPro Image Gallery
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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: 49  
Listed functions:
OpenEvent
ResetEvent
WaitForSingleObject
Printer friendly API declarations
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