Using Win32 functions in Visual FoxPro Image Gallery
Code examples:
How to change display settings: screen resolution, screen refresh rate
Capturing keyboard activity of another application with the Raw Input API (VFP9)
Changing file attributes
Converting Unicode data from the Clipboard to a character string using a given code page
Copying picture of the active form to the Clipboard using Enhanced Metafile API functions
How to print FoxPro form
Obtaining current Internet Explorer browser version and UserAgent
Enumerating data formats currently available on the clipboard
Custom GDI+ class
Creating a clipping region from the path selected into the device context of a form
Enumerating raw input devices attached to the system (keyboard, mouse, human interface device)
GDI+: copying to the Clipboard (a) image of active FoxPro window/form, (b) image file
Storing content of the Clipboard to a bitmap file
How to create transparent areas inside a form -- punching holes in the form
FindText -- the hopeless and useless Common Dialog
Using EnumPrinters function to enumerate locally installed printers
Enumerating Processes -- WinNT
A procedure for setting file times
Storing screen shot of a form to bitmap file
Retrieving the name of the primary domain controller (PDC) and join status information
Using FrameRgn for displaying system colors
Using the DeleteFile
Using the Semaphore object to allow only one instance of VFP application running
Placing a button on the VFP form as a new child window
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.
#include "stdafx.h"
#include < windows.h >
#include < shlwapi.h >

void StartOnScreenKeyboard();

int _tmain(int argc, _TCHAR* argv[])
{
    StartOnScreenKeyboard();
    return 0;
}

void StartOnScreenKeyboard()
{
    const char* oskPath = "osk.exe";

    char* winDirPath = (char*)calloc(MAX_PATH, 1);
    GetEnvironmentVariable("WINDIR", winDirPath, MAX_PATH);
    if (!winDirPath) return;

    char* sysDirPath = (char*)calloc(MAX_PATH, 1);
    char* targetPath = (char*)calloc(MAX_PATH, 1);

    PathCombine(targetPath, winDirPath, "sysnative");
    PathCombine(targetPath, targetPath, oskPath);

    if (!PathFileExists(targetPath))
    {
        GetSystemDirectory(sysDirPath, MAX_PATH);
        PathCombine(targetPath, sysDirPath, oskPath);
    }

    free(sysDirPath);
    free(winDirPath);

    if (PathFileExists(targetPath))
    {
        ShellExecute(
            (HWND)0, 
            "open", 
            targetPath, 
            NULL, 
            NULL, 
            SW_NORMAL);
    }

    free(targetPath);
}

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943 bytes  
Created: 2012-02-18 22:46:23  
Modified: 2013-08-14 11:46:10  
Visits in 7 days: 106  
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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