Using Win32 functions in Visual FoxPro Image Gallery
Code examples:
Generating random UUID values
Retrieving country-specific dialing information from the Windows Telephony list of countries
Accessing the list of Windows Recent Documents
GetFileOwner - Get the owner of an NTFS file
How to get the path to a Special Folder
How to start the screen saver and how to find whether the screen saver is active
Retrieving list of available disk drives
Converting a decimal string to an integer
GDI+: converting image file to another graphics format
Retrieving list of supported paper names (for example, Letter or Legal) for a given printer
Using GetFileSize
Converting long file names to the short format and vice versa
How to fill a buffer with random bytes using Cryptography API Functions
Obtaining the System and Windows folder names
Setting the Window Region for a form
Closing Windows
Enumerating Volumes and Volume Mounting Points (NTFS)
Retrieving default spooling directory name
Retrieving national language settings
Enumerating forms supported by a specified printer
How to access a file using not its name but an alias (hard link)
Using the CopyFile
How to create a service object
Retrieving information about MS-DOS device names using QueryDosDevice (WinNT only)
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

#DEFINE HEAP_ZERO_MEMORY   8

* MSDN: the HEAP_NO_SERIALIZE value can, be safely used 
* the process has only one thread -- this is how the VFP is
#DEFINE HEAP_NO_SERIALIZE  1

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()
ELSE
    ? "The largest committed free block in the heap:",;
            ALLTRIM(TRANS(lnFreeSize, "999,999,999,999,999")), "bytes"
ENDIF

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

PROCEDURE  decl
    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: 47  
Listed functions:
GetLastError
GetProcessHeap
HeapCompact
HeapValidate
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 2001-2016 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 (5.6.30), the Open Source standard SQL database, AceHTML Freeware Version 4, freeware HTML Editor of choice.   Hosted by Korax Online Inc.
Last Topics Visited (54.81.59.42)
23 sec.Function: 'CryptStringToBinary'
1.75 min.Example: 'A client for testing non-blocking Winsock server'
Google
Advertise here!