Using Win32 functions in Visual FoxPro Image Gallery
Code examples:
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GDI+: loading image file, drawing on it, saving the result to another file
Listing device drivers in the system: load addresses, names
Determining whether or not the system is connected to the Internet
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GDI+: Using Scale and Shear transformations
Managing Cookies
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Controlling master audio volume by sending WM_APPCOMMAND messages
Creating a file, then moving it to another destination
Retrieving the System Time adjustment
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Determining if an Active Network Connection is Available
How to check whether the system is 32-bit or 64-bit
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How to access a file using not its name but an alias (hard link)
Obtaining window class name for the main VFP window
Retrieving window and menu help context identifiers
Retrieving the rectangle area where the mouse cursor is confined
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: 140  
Listed functions:
GetLastError
GetProcessHeap
HeapCompact
HeapValidate
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