Using Win32 functions in Visual FoxPro Image Gallery
Code examples:
GDI+: copying to the Clipboard (a) image of active FoxPro window/form, (b) image file
Capturing keyboard activity of another application with the Raw Input API (VFP9)
GDI+: Implementing image scrolling with inertia
Using Video Capture: displaying on FoxPro form frames and previewing video obtained from a digital camera
Copying picture of the active form to the Clipboard using Enhanced Metafile API functions
Using Month Calendar Control (VFP9, Comctl32.dll)
Custom GDI+ class
Enumerating raw input devices attached to the system (keyboard, mouse, human interface device)
Converting Unicode data from the Clipboard to a character string using a given code page
Enumerating data formats currently available on the clipboard
Displaying dimmed window behind VFP top-level form
Winsock: sending email messages (SMTP, port 25)
Obtaining names and positions for shortcuts located on the Windows Desktop
Detecting changes in connections to removable drives (VFP9)
Displaying icons in the system tray (VFP9)
How to find which fonts Windows uses for drawing captions, menus and message boxes
Monitoring clipboard content changes (VFP9)
Displaying Windows shell folders in TreeView control with Visual FoxPro FLL
Winsock: reading email messages (POP3, port 110)
How to load a user profile
Displaying hypertext links with the SysLink control (VFP9, Comctl32.dll)
Windows Shell Icons displayed and exported to ICO files (Vista)
Browsing Windows Known Folders (Special Folders)
Creating a clipping region from the path selected into the device context of a form
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 using Windows On-Screen Keyboard instead. This virtual keyboard 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);
}

User rating: 7.5/10 (4 votes)
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943 bytes  
Created: 2012-02-18 22:46:23  
Modified: 2015-10-28 09:36:34  
Visits in 7 days: 77  
Listed functions:
GetSystemDirectory
PathCombine
ShellExecute
Printer friendly API declarations
My comment:

On-Screen Keyboard`s window class name is "OSKMainClass". Knowing this, a VFP application can test the visibility of the On-Screen Keyboard by calling the FindWindow. By calling the SetWindowPos or similar API function, the virtual keyboard can be shown, hidden, or positioned at a specified point on the screen.
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