Using Win32 functions in Visual FoxPro Image Gallery
Code examples:
Analyzing character types in a specified string
Closing Windows
Comparing file times
Controlling master audio volume by sending WM_APPCOMMAND messages
Converting twips to pixels and vice versa
Determining whether or not the system is connected to the Internet
Drawing a rectangle using Windows regular edges and borders
Enumerating forms supported by a specified printer
Enumerating MIDI output devices
Generating sequential UUID values
How to get the path to a Special Folder
List of ODBC drivers installed (read from the [ODBC Drivers] section)
Number of clipboard formats available
Obtaining information about all user accounts on a server (WinNT only)
Obtaining names of local and global groups for current user (WinNT/XP/2K)
Obtaining OS memory performance information
Obtaining window class name for the main VFP window
One more way to retrieve environment strings
Reading and setting explicit Application User Model ID for the current process (Win7)
Retrieving list of supported paper names (for example, Letter or Legal) for a given printer
Retrieving names for the registered clipboard formats
Retrieving Network Provider information
Retrieving the path of the printer-driver directory and printer-processor directory
Saying "Hello World!" with VFP and WinAPI
Validating the heap of the calling process

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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


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1189 bytes  
Created: 2001-12-01 08:43:07  
Modified: 2001-12-01 08:43:41  
Visits in 7 days: 9  
Listed functions:
GetLastError
GetProcessHeap
HeapCompact
HeapValidate
Printer friendly API declarations
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