Using Win32 functions in Visual FoxPro Image Gallery
Code examples:
Reading current hardware profile
Retrieving list of Global Atom names
Setting the Window Region for a form
Closing Windows
Retrieving current settings for an ODBC connection
Current keyboard type
Pocket PC: retrieving data from the Contacts Database
The SQLGetProp() creates a bridge between Visual FoxPro and the ODBC API
Validating URLs using moniker functions
Converting characters in a URL into corresponding escape sequences and backwards
Listing device drivers in the system: load addresses, names
Retrieving the names of all sections in an initialization file
Current directory of the application
PocketPC: creating directories and files
Power capabilities of the system: battery, UPS, sleep and hibernation modes, processor throttling
Retrieving list of supported paper names (for example, Letter or Legal) for a given printer
Using custom Simple MapiSendMail class
Retrieving information about MS-DOS device names using QueryDosDevice (WinNT only)
Using GetSysColor
Obtaining provider name for a specific type of network
Pocket PC: Folder Viewer
Reading STARTUPINFO structure for the current VFP session
Retrieving list of all active RAS connections
Who is the first in viewing the Clipboard
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: 136  
Listed functions:
GetLastError
GetProcessHeap
HeapCompact
HeapValidate
Printer friendly API declarations
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