Using Win32 functions in Visual FoxPro Image Gallery
Code examples:
Pocket PC: Folder Viewer
Retrieving the rectangle area where the mouse cursor is confined
Retrieving the state of your Internet connection
Creating a file, then moving it to another destination
How to fill a buffer with random bytes using Cryptography API Functions
Managing Cookies
Programmatically removing submenus from VFP main menu
The original LoadPicture() function in VFP returns valid handles to bitmaps, icons, cursors, and metafiles
Using IsChild() for testing ThisForm.ShowWindow property
Disabling drawing in the VFP form
How to get the path to a Special Folder
How to retrieve the number of objects stored in the Recycle Bin
Obtaining Shell32.dll version
Validating URLs using moniker functions
Initiating Inet connection using a modem
Power capabilities of the system: battery, UPS, sleep and hibernation modes, processor throttling
Retrieving the path of the printer-driver directory and printer-processor directory
High-powered ALLTRIM
How to hide your program from the Close Program dialog (Win9* only)
Creating two-byte hashes for a list of URLs
Finding the application, icon and friendly names associated with a file name
Finding the path to the VFP executable running
Printf-style formatted text output in VFP
Retrieving various system metrics
Validating the heap of the calling process

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
DO decl


* MSDN: the HEAP_NO_SERIALIZE value can, be safely used 
* the process has only one thread -- this is how the VFP is

LOCAL hProcHeap, lnFreeSize

* retrieving a handle to the heap of the calling process
hProcHeap = GetProcessHeap()
? "Calling process heap handle:", hProcHeap

* making an attempt to compact the calling process heap
* supported in Windows NT/2000/XP, not in Windows 95/98/Me
lnFreeSize = HeapCompact (hProcHeap, HEAP_NO_SERIALIZE)
IF lnFreeSize = 0
* 120 = This function is not supported on this system.
    ? "Error code:", GetLastError()
    ? "The largest committed free block in the heap:",;
            ALLTRIM(TRANS(lnFreeSize, "999,999,999,999,999")), "bytes"

* validating the calling process heap
? "The heap is valid:",;
    Iif(HeapValidate (hProcHeap, HEAP_NO_SERIALIZE, 0)=0, "No","Yes")

    DECLARE INTEGER GetLastError IN kernel32
    DECLARE INTEGER GetProcessHeap IN kernel32

    DECLARE INTEGER HeapCompact IN kernel32;
        INTEGER hHeap, INTEGER dwFlags

    DECLARE INTEGER HeapValidate IN kernel32;
        INTEGER hHeap, INTEGER dwFlags, INTEGER lpMem

User rating: 0/10 (0 votes)
Rate this code sample:
  • ~
1189 bytes  
Created: 2001-12-01 08:43:07  
Modified: 2001-12-01 08:43:41  
Visits in 7 days: 73  
Listed functions:
Printer friendly API declarations
Word Index links for this example:
Translate this page:
  Spanish    Portuguese    German    French    Italian 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 (5.6.37), the Open Source standard SQL database, AceHTML Freeware Version 4, freeware HTML Editor of choice.   Hosted by Korax Online Inc.
Last Topics Visited (
3 sec.Example: 'GDI+: how to make VFP controls visually shake and shudder'
5 sec.Function: 'GdipNewInstalledFontCollection'
7 sec.Function: 'GdipGetDpiX'
9 sec.Function: 'GetTickCount'
12 sec.Function: 'ChooseFont'
16 sec.Example: 'Using the DeleteFile'
19 sec.Function: 'JetEndSession'
20 sec.Function: 'SCardListReaderGroups'
22 sec.Function: 'InternetGetConnectedStateEx'
Function group: 'Internet Functions (WinInet)'
25 sec.Function: 'GetTextFace'
Advertise here!