Using Win32 functions in Visual FoxPro Image Gallery
Code examples:
Encapsulating access to the Windows Services in a class
System Image List Viewer
Retrieving the command line for the VFP session
Creating the Open dialog box to specify the drive, directory, and name of a file to open
Using Video Capture: displaying on FoxPro form frames and previewing video obtained from a digital camera
How to change display settings: screen resolution, screen refresh rate
Custom GDI+ class
Extended MessageBox Class
Printing Image File, programmatically set print page orientation to landscape
Creating irregularly shaped FoxPro form using transparency color key
Winsock: sending email messages (SMTP, port 25)
Enumerating devices installed on the local machine
GDI+: copying to the Clipboard (a) image of active FoxPro window/form, (b) image file
Using FoxTray ActiveX control: System Tray Icon and menu attached to VFP form
Accessing examples contained in this reference through Web Services
Obtaining names and positions for shortcuts located on the Windows Desktop
Custom FTP Class for Visual FoxPro application
Custom HttpRequest class (WinHTTP)
Placing On-screen Alert on top of all windows
Retrieving the name of the default printer for the current user on the local computer (Win NT/XP)
Adding user-defined items to the Control Menu of VFP form (requires VFP9)
Printing text on the client area of the main VFP window
Using Extended MessageBox() Class
Using Path functions from Shell Lightweight Utility APIs (shlapi.dll)
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);
}

User rating: 7.5/10 (4 votes)
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943 bytes  
Created: 2012-02-18 22:46:23  
Modified: 2013-08-14 11:46:10  
Visits in 7 days: 29  
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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