Using Win32 functions in Visual FoxPro Image Gallery
Code examples:
Placing a button on the VFP form as a new child window
Splash Screen for the VFP application
StrDup returns a pointer to the duplicate of a source VFP string
Using the CopyFile
Using the LoadImage function to have a bitmap file loaded and displayed on VFP main window
Displaying animated images on FoxPro form with BitBlt and StretchBlt functions
Drawing a window caption using the DrawCaption routine
Enumerating ODBC Data Sources available on the local computer
How to enumerate, add and delete shares on the local computer (WinNT/XP)
How to print picture stored in enhanced-format metafile (*.emf)
Passing data records between VFP applications via the Clipboard
Using InternetSetFilePointer when resuming interrupted download from the Internet
Enhanced GetFont dialog
Enumerating network interfaces on the local computer
Enumerating Volumes and Volume Mounting Points (NTFS)
Reading and setting Environment variables
Using GetBinaryType (WinNT only) to determine the type of an executable file
Using the SystemParametersInfo function
A procedure for setting file times
Accessing LSA Policy object (Local Security Authority)
Copying files as a transacted operation (Vista)
How to download this reference`s archive through WinInet functions using InternetOpenUrl
How to extract frames from AVI files
How to initiate System shutdown
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

User rating: 7.5/10 (4 votes)
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1457 bytes  
Created: 2012-02-18 22:46:23  
Modified: 2013-08-14 11:46:10  
Visits in 7 days: 172  
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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