Using Win32 functions in Visual FoxPro Image Gallery
Code examples:
Reading STARTUPINFO structure for the current VFP session
Testing if a connection to an Url can be established
Using SQLBrowseConnect to connect to a data source through a number of iterative calls (SQL Server)
Retrieving default spooling directory name
Retrieving statistics for the TCP protocol running on the local computer
Testing Transparent Menu Class with top-level form (requires VFP9)
Validating URLs using moniker functions
Converting characters in a URL into corresponding escape sequences and backwards
Retrieving the name and type of all available RAS-capable devices
Using GetSysColor
Using the FindMediaType function
Creating a file, then moving it to another destination
Displaying the main Dial-Up Networking dialog box
Pocket PC: creating new database in the Object Store and copying Contacts Database records into it
Power capabilities of the system: battery, UPS, sleep and hibernation modes, processor throttling
How to drag a Form not using its Titlebar or Caption
GDI+: converting text strings to images and saving in a graphics file
PocketPC: creating directories and files
Retrieving list of all active RAS connections
GDI+: loading image file, drawing on it, saving the result to another file
Printf-style formatted text output in VFP
URL: converting unsafe characters and spaces into escape sequences
Using the IsWindowEnabled function
Pocket PC: retrieving data from the Contacts Database
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: 58  
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 2001-2017 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 (5.6.35), the Open Source standard SQL database, AceHTML Freeware Version 4, freeware HTML Editor of choice.   Hosted by Korax Online Inc.
Last Topics Visited (54.161.178.52)
1 sec.Example: 'Storing content of the Clipboard to a bitmap file'
3 sec.Function: 'ReleaseDC'
4 sec.Example: 'Using the DeleteFile'
6 sec.Function: 'GetClassInfo'
Function group: 'Window Class'
7 sec.Example: 'How to change display settings: screen resolution, screen refresh rate'
Language: 'C++'
9 sec.Example: 'How to assemble an array of strings and pass it to external function'
11 sec.Function: 'Shell_NotifyIcon'
Function group: 'Shell Functions'
12 sec.Function: 'RtlDecompressBuffer'
13 sec.Function: 'PageSetupDlg'
14 sec.Function: 'CryptEnumProviders'
Function group: 'Cryptography Reference'
Google
Advertise here!