Using Win32 functions in Visual FoxPro Image Gallery
Code examples:
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How to empty the Recycle Bin
Pocket PC: modifying keys in the System Registry
Reading STARTUPINFO structure for the current VFP session
Retrieving country-specific dialing information from the Windows Telephony list of countries
Using the IsWindowEnabled function
Validating URLs using moniker functions
Retrieving System Error message strings
Converting characters in a URL into corresponding escape sequences and backwards
Current System information
Retrieving IP statistics for the computer
Retrieving statistics for the TCP protocol running on the local computer
Retrieving window and menu help context identifiers
Using LoadLibrary
Using SQLBrowseConnect to connect to a data source through a number of iterative calls (SQL Server)
Closing Windows
GDI+: custom control, base class
Displaying the main Dial-Up Networking dialog box
Obtaining provider name for a specific type of network
Power capabilities of the system: battery, UPS, sleep and hibernation modes, processor throttling
Retrieving the name and type of all available RAS-capable devices
Retrieving the state of your Internet connection
Winsock: how to retrieve the protocol information corresponding to a protocol number
Pocket PC: Folder Viewer
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: 50  
Listed functions:
GetLastError
GetProcessHeap
HeapCompact
HeapValidate
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