Using Win32 functions in Visual FoxPro Image Gallery
Code examples:
Pocket PC: modifying keys in the System Registry
Retrieving Network Provider information
URL: converting unsafe characters and spaces into escape sequences
Winsock: initializing the service in the VFP application
GDI+: custom control, base class
How to access a file using not its name but an alias (hard link)
Obtaining the System and Windows folder names
StrDup returns a pointer to the duplicate of a source VFP string
Using the FindMediaType function
How to obtain the number of rows affected by remote UPDATE, INSERT or DELETE statement
Setting the mouse capture to the specified window
Using LoadLibrary
Converting characters to upper or lower case
Dynamic strings implemented through VFP Custom class
How to delete a service object
How to fill a buffer with random bytes using Cryptography API Functions
How to get the path to a Special Folder
Pocket PC: retrieving data from the Contacts Database
Retrieving information about MS-DOS device names using QueryDosDevice (WinNT only)
Enumerating forms supported by a specified printer
How to create a service object
Using the CopyFile
Displaying the color palette stored in an image file
GDI+: converting text strings to images and saving in a graphics file
Using an Event Object. Part B: running an application responding to events

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
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


User rating: 0/10 (0 votes)
Rate this code sample:
  • ~
1878 bytes  
Created: 2001-09-16 12:00:00  
Modified: 2005-12-27 10:34:41  
Visits in 7 days: 33  
Listed functions:
OpenEvent
ResetEvent
WaitForSingleObject
Printer friendly API declarations
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 2001-2014 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 (5.1.68), the Open Source standard SQL database, AceHTML Freeware Version 4, freeware HTML Editor of choice.   Hosted by Korax Online Inc.
Last Topics Visited (54.196.204.42)
32 sec.Example: 'Displaying the main Dial-Up Networking dialog box'
2 day(s)Example: 'Creating the Save dialog box to specify the drive, directory, and name of a file to save'
 Function: 'NetScheduleJobEnum'
Function group: 'Network Management'
 Function: 'SetMonitorContrast'
 Function: 'CryptGetProvParam'
Function group: 'Cryptography Reference'
Google
Advertise here!