Using Win32 functions in Visual FoxPro Image Gallery
Code examples:
CryptoAPI: retrieving list of providers
GDI+: printing vertical text on VFP reports via generated images (VFP8)
Retrieving list of supported paper names (for example, Letter or Legal) for a given printer
Pocket PC: enumerating mounted database volumes and databases in the Object Store
PocketPC: creating directories and files
GDI+: enumerating fonts installed on the system
Retrieving default spooling directory name
GDI+: Storing DLL icon resources in image files
Pocket PC: modifying keys in the System Registry
Who owns the Windows Clipboard
Terminating VFP application using the FatalAppExit
GetFileOwner - Get the owner of an NTFS file
List of ODBC drivers installed (read from the [ODBC Drivers] section)
Retrieving current user for the process
Copying files as a transacted operation (Vista)
Pocket PC: System Registry Viewer
Retrieving various system metrics
Accessing a CD device (cdaudio) with Multimedia Command Strings
How to intercept window messages sent to VFP form
Pocket PC: retrieving data from the Contacts Database
Using GetCompressedFileSize (WinNT only)
Using Multimedia Command Strings to play MIDI files
How to get the path to a Special Folder
Saving available locale records into a cursor
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: 182  
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 2001-2014 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 (54.226.168.96)
5 sec.Example: 'How to delete a service object'
8 sec.
Function group: 'GDI+ Brush'
13 sec.Function: 'SendMessage'
14 sec.Function: 'GetWindowPlacement'
Function group: 'Window'
16 sec.Function: 'ReadProcessMemory'
17 sec.Function: 'TaskDialogIndirect'
20 sec.Function: 'waveInGetErrorText'
Function group: 'Windows Multimedia'
22 sec.Function: 'InternetGoOnline'
Function group: 'Internet Functions (WinInet)'
27 sec.Function: 'CryptStringToBinary'
31 sec.Example: 'How to perform Base64 encoding/decoding using Cryptography API Functions'
Google
Advertise here!