Using Win32 functions in Visual FoxPro Image Gallery
Code examples:
How to save registry key including its subkeys and values to a file
Locking the workstation
Obtaining a handle to the desktop associated with the calling thread
Obtaining physical parameters for a drive: sectors, clusters, cylinders...
Printing text on the main VFP window
Reading the structure of VFP main menu
Setting the volume label
The original LoadPicture() function in VFP returns valid handles to bitmaps, icons, cursors, and metafiles
Using the DeleteFile
Using the NetMessageBufferSend to send messages on the network
Winsock: retrieving information about available transport protocols
Converting a hexadecimal string to an integer
Creating a unique filename based on existing filename
Creating hash values for the list of names
Creating two-byte hashes for a list of URLs
Drawing icons associated with the VFP main window
How to view system icons for the classes installed on the local machine
Obtaining Shell32.dll version
PocketPC: custom RAPI class for executing routines on remote Windows CE device
Retrieving file information for the VFP executable running
Retrieving list of files on the FTP directory
Scanning the hierarchy of child windows down from the main VFP window
Using GetBinaryType (WinNT only) to determine the type of an executable file
Using InternetGoOnline function
How to display Windows On-Screen Keyboard

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Before you begin:

For data entry, instead of relying on the physical keyboard, user may choose to use Windows On-Screen Keyboard that gives access to all standard keys.

On-Screen Keyboard executable file, osk.exe, resides in System32 directory. Note that on 64-bit systems this file cannot be launched from 32-bit process. "File System Redirector" article on MSDN explains why:
32-bit applications can access the native system directory by substituting %windir%\Sysnative for %windir%\System32. WOW64 recognizes Sysnative as a special alias used to indicate that the file system should not redirect the access.
#DEFINE MAX_PATH 260
#DEFINE OSK_EXE "osk.exe"

DO declare
= ShellExecute(0, "open", GetOskPath(), "", "", 1)
* end of main

FUNCTION GetOskPath() As String
    LOCAL cPath

    cPath = PathCombine(;
        GETENV("windir"),;
        "sysnative",;
        OSK_EXE )

    IF FILE(cPath)
        RETURN m.cPath
    ENDIF

    cPath = PathCombine(;
        GetSysDir(),;
        OSK_EXE )

RETURN IIF(FILE(cPath), m.cPath, OSK_EXE)

FUNCTION GetSysDir
    LOCAL cBuffer, nBufsize
    cBuffer=REPLICATE(CHR(0), MAX_PATH)
    nBufsize= GetSystemDirectory(@cBuffer, LEN(cBuffer)) 
RETURN SUBSTR(cBuffer, 1, nBufsize)

FUNCTION PathCombine(p1, p2, p3, p4, p5) As String
    LOCAL cBuffer, cPath1, cPath2, nIndex, nCount
    nCount = PCOUNT()

    DO CASE
    CASE nCount = 0
        RETURN ""
    CASE nCount = 1
        RETURN p1
    ENDCASE

    cBuffer = m.p1

    FOR nIndex=2 TO nCount
        cPath1 = STRTRAN(m.cBuffer, CHR(0), "")
        cPath2 = EVALUATE("m.p" + TRANSFORM(m.nIndex))
        cBuffer = REPLICATE(CHR(0), MAX_PATH)
        PathCombineApi(@cBuffer, cPath1, cPath2)
    NEXT
RETURN STRTRAN(m.cBuffer, CHR(0), "")

PROCEDURE declare
    DECLARE INTEGER GetSystemDirectory IN kernel32;
        STRING @lpBuffer, INTEGER nSize

    DECLARE INTEGER ShellExecute IN shell32;
        INTEGER hWindow, STRING lpOperation,;
        STRING lpFile, STRING lpParameters,;
        STRING lpDirectory, INTEGER nShowCmd

    DECLARE INTEGER PathCombine IN shlwapi;
    AS PathCombineApi;
        STRING @lpszDest, STRING lpszDir,;
        STRING lpszFile

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1457 bytes  
Created: 2012-02-18 22:46:23  
Modified: 2013-08-14 11:46:10  
Visits in 7 days: 113  
Listed functions:
GetSystemDirectory
PathCombine
ShellExecute
Printer friendly API declarations
My comment:

On-Screen Keyboard class name is "OSKMainClass". With this knowledge, a VFP application can detect whether the On-Screen Keyboard window is visible -- by calling FindWindow. It can also move and hide the keyboard -- by calling SetWindowPos or similar API function.
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