Using Win32 functions in Visual FoxPro Image Gallery
Code examples:
Current directory of the application
Obtaining the System and Windows folder names
How to play a waveform sound (a WAV file in particular)
Saying "Hello World!" with VFP and WinAPI
Copying files as a transacted operation (Vista)
How to perform Base64 encoding/decoding using Cryptography API Functions
WAV file recorder
Converting a decimal string to an integer
Converting characters to upper or lower case
Enumerating forms supported by a specified printer
Retrieving current user for the process
Using Multimedia Command Strings to play MIDI files
Using the GetLogicalDriveStrings
Closing Windows
Converting path to original case
GDI+: loading image file, drawing on it, saving the result to another file
Listing device drivers in the system: load addresses, names
Retrieving default spooling directory name
Using custom Simple MapiSendMail class
Using LoadLibrary
Using SQLBrowseConnect to connect to a data source through a number of iterative calls (SQL Server)
Basic Volume information
Finding the application, icon and friendly names associated with a file name
GDI+: custom control, base class
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: 59  
Listed functions:
GetLastError
GetProcessHeap
HeapCompact
HeapValidate
Printer friendly API declarations
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