Using Win32 functions in Visual FoxPro Image Gallery
Code examples:
Accessing examples contained in this reference from a VFP application
Clipping mouse cursor area
Converting command-line string to a set of Unicode argument strings
Drawing Windows frame controls using the DrawFrameControl function
Finding out if the current user is the Guest account
GDI+: retrieving list of available image encoders and image decoders
How to make the caption of a VFP application flashing in the Windows task bar
How to write and read Window Properties for the specified window
Obtaining a handle to the desktop associated with the calling thread
Obtaining names of local and global groups for current user (WinNT/XP/2K)
Obtaining the bounding rectangle for the specified device context
Reading data from INI files
Retrieving the interface–to–IP address mapping table
Scanning the hierarchy of child windows down from the main VFP window
Setting the mouse capture to the specified window
Using GetNearestColor
Using Path functions from Shell Lightweight Utility APIs (shlapi.dll)
Using the GradientFill function
Winsock: creating a socket that is bound to a specific service provider
Connecting a local device to a network resource
Converting long file names to the short format and vice versa
GDI+: cropping images
How to display a dialog box with which the user can add a data source (DSN)
How to position the GETPRINTER() dialog
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: 7/10 (3 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: 124  
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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